Advanced and safer lithium-ion battery based on sustainable electrodes

Advanced and safer lithium-ion battery based on sustainable electrodes

Journal of Power Sources 379 (2018) 53–59 Contents lists available at ScienceDirect Journal of Power Sources journal homepage:

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Journal of Power Sources 379 (2018) 53–59

Contents lists available at ScienceDirect

Journal of Power Sources journal homepage:

Advanced and safer lithium-ion battery based on sustainable electrodes a



Xiang Ding , Xiaobing Huang , Junling Jin , Hai Ming



, Limin Wang , Jun Ming




Hunan Province Cooperative Innovation Center for the Construction & Development of Dongting Lake Ecological Economic Zone, College of Chemistry and Materials Engineering, Hunan University of Arts and Science, Changde, 415000, Hunan, P.R. China State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 215123, P.R. China c Research Institute of Chemical Defense, Beijing, 100191, P.R. China d King Abdullah University of Science & Technology, Thuwal, Saudi Arabia b



new porous structured anatase TiO • Ananobundles (PTNBs) is synthesized. synthetics strategy is green and • The the formation mechanism is discussed. PTNBs exhibits high lithium sto• The rage capacity and better rate cap-



and safer Li-ion full bat• Sustainable tery of PTNBs/LiNi Mn O are prex






Keywords: Lithium-ion battery Oxide Titania Anode Cathode Sustainability

Seeking advanced and safer lithium-ion battery with sustainable characteristic is significant for the development of electronic devices and electric vehicles. Herein, a new porous TiO2 nanobundles (PTNBs) is synthesized though a scalable and green hydrothermal strategy from the TiO2 powders without using any high-cost and harmful organic titanium-based compounds. The PTNBs exhibits an extremely high lithium storage capacity of 296 mAh g−1 at 100 mA g−1, where the capacity can maintain over 146 mAh g−1 even after 500 cycles at 1000 mA g−1. To pursue more reliable Li-ion batteries, full batteries of PTNBs/LiNixMn1-xO4 (x = 0, 0.5) using spinel structured cathode are constructed. The batteries have the features of sustainability and deliver high capacities of 112 mAh gcathode−1 and 102 mAh gcathode−1 with stable capacity retentions of 99% and 90% over 140 cycles. Note that the energy densities can achieve as high as 267 and 270 Wh kgcathode−1 (535 and 540 Wh kganode−1) respectively, which is feasible to satisfy diverse requirements for energy storage products. We believe that the universal synthetic strategy, appealing structure and intriguing properties of PTNBs is applicable for wider applications, while the concept of sustainable strategy seeking reliable and safer Li-ion battery can attract broad interest.

1. Introduction The safety issue and sustainability of lithium-ion batteries (LIBs) has attracted more attention because it has become one bottle-neck in the

dramatically increased demand of grid energy storage system, electronic devices and electric vehicles [1–3]. To guarantee the durability of LIBs, the strategies of controlling inner thermal effect [4], adding stabilizer in electrolyte [5,6], modifying battery configuration [7,8],

∗ Corresponding author. State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 215123, P.R. China. ∗∗ Corresponding author. Research Institute of Chemical Defense, Beijing, 100191, P.R. China E-mail address: [email protected] (J. Ming). Received 5 October 2017; Received in revised form 2 January 2018; Accepted 9 January 2018 0378-7753/ © 2018 Elsevier B.V. All rights reserved.

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ingredients of LiNixMn2-xO4 cathode, Super P, graphite and polyvinylidene difluoride (PVDF) binder with the mass ratio of 8.5:0.5:0.5:0.5 was mixed to form a slurry in the N-Methyl-2-pyrrolidone (NMP). The slurry was casted on the aluminium foil and then dried at 120 °C for 12 h before punch. The mass density of LiMn2O4 and LiNi0.5Mn1.5O4 were controlled around at 4 mg cm−2.

and developing solid-state batteries [9] are being widely investigated. All these researches greatly improve the safety factors; however, more technologies and knowledges are still quested towards more reliable battery system particularly satisfying for the sustainable development [10]. Based on the model of current LIBs (i.e., graphite vs. lithium layered metal oxide), several aspects can be further explored. For example, replace of graphite anode, because its low voltage for the lithium-ions intercalation may lead the formation of lithium dendrites, which can impale the separator and cause the short circuit [11]. Besides, the flammable properties of carbon anode and lithiated carbon (i.e., LixC6) [12], together with the side reactions of electrode and electrolyte beyond a high cut-off voltage (e.g., > 4.0 V) [13,14], always lead to an unsatisfactory safety, low Coulomb Efficiency (CE) and severe capacity decay. Thus herein, we choose sustainable TiO2 as anodic material considering its non-flammable characteristic and the moderate voltage platform (i.e., ∼1.7 V) for the storage of lithium. Distinct from the previous researches preparing the TiO2-based composites via conductive compositions modification [15–17], metal/non-metal elementsdoping [18–20], and/or surface coating/nitridation/hydronation [21–23], a scalable, green and convenient strategy was developed to synthesize a novel structured TiO2 nanobundles (PTNBs), which demonstrates extremely high and even better performances in lithium (ion) battery. To design the safer and sustainable LIBs, the cobalt-free, cost-effective and spinel structured LiNixMn2-xO4 (x = 0, 0.5) cathode is chosen instead of lithium layered metal oxide considering its higher stability [24]. It is well known that the oxygen evolution reaction of lithium layered metal oxide as cycling remains challenging in current LIBs [25]. Stimulated by the high capacity of PTNBs (e.g., 280 mAh g−1 at 100 mA g−1) available in industrial production, two kinds full batteries of PTNBs/LiNixMn2-xO4 with high CE and stability have been introduced. The constructed battery is reliable and has the advantages of improved safety, stability and sustainability, where the features can satisfy diverse requirements in sustainable energy storage products.

2.3. Characterizations and measurements The crystal information was acquired by X-ray powder diffraction (XRD) using a X‘Pert-ProMPD (Holand) D/max-γA X-ray diffractometer with Cu Kα radiation (λ = 0.154178 nm). The morphology of PTNBs was characterized by the scanning electron microscopy (SEM) on a FEIquanta 200 F scanning electron microscope with acceleration voltage of 30 kV. The distribution and crystalline structure of PTNBs was analysed by the transmission electron micrograph (TEM) with using the FEITecnai F20 (200 kV) transmission electron microscope (FEI). Nitrogen adsorption-desorption isotherms were measured by the instrument of ASAP2050 (Micromeritics Instrument Corporation) surface area & porosity Analyzer at 77 K. The electrochemical tests were carried out using the 2032-type coin cell and they were assembled in the glove box filled with pure argon, in which the moisture and oxygen were strictly controlled below 0.1 ppm. The half-cell has the configuration of Li metal (−) | Microporous polypropylene separator | electrode (+) filled with the electrolyte of 1.0 M LiPF6, 1 wt% vinylene carbonate (VC) additive in the mixture of ethylene carbonate (EC)/diethyl carbonate (DEC) (w/w, 1/1). In the full battery, the electrodes of LiMn2O4 or LiNi0.5Mn1.5O4 were applied as cathode versus the anode of pre-lithiated PTNBs. The principle of designing full battery was followed by the description in recent literature [28]. Before assembling the full battery, the PTNBs electrode is prelithiated first to compensate the irreversibility. The prelithiation process is similar as the that in recent literature [28], in which the PTNBs electrode contacts with the electrolyte-wetted lithium foil and reacts for a certain time. The amount of lithium in anode after the prelithiation can be controlled by the reaction time and calculated by the discharged capacity differences in the first cycle comparing to that of the pristine one. Generally, the prelithiation procedure is needed to get a good battery performance; otherwise the large irreversibility of anode (i.e., PTNBs) would consume a large part of lithium ions from cathode, leading to a low coulombic efficiency and inferior cycle ability. Galvanostatic charge-discharge was conducted by the TOSCAT-3100 at different current densities, and the cyclic voltammetry was collected by the instrument of Biologic VMP3 under the scan rate of 0.1 mV s−1.

2. Experimental 2.1. Synthesis of PTNBs Typically, 1.0 g industrial-grade TiO2 powders were dispersed into 70 mL 10.0 M NaOH solution and stirred for 4 h. The solution was transferred into Teflon lined stainless steel autoclave and thermally treated at 180 °C for 24 h in oven. After cooling down to the room temperature, the powders were collected by filtration and then washed by HCl (pH = 1) and water to neutral. The powders were re-dispersed into 70 mL 1.0 M acetic acid solution and kept stirring for 30 min; subsequently the solution was thermally treated at 180 °C for 4 h in the Teflon lined stainless steel autoclave. Finally, calcination of the powders at 500 °C for 4 h under a steady air gives rise to the product of PTNBs.

3. Results and discussion 3.1. Features of PTNBs The PTNBs has a high crystallization belonging to the anatase TiO2 (JCPDS Card No. 89-4921) (Fig. 1a). The features of PTNBs including the morphology of uniform nanobundles, high length/dimeter ratio (e.g., average length of 1–5 μm with the diameter of 200 nm) and rich porosity were demonstrated in SEM and TEM images (Fig. 1b–c). The nanobundle consists of connected nanocrystals, where numerous pores and crystalline boundaries were constructed, giving rise to a rough surface. The building block of nanocrystals has the lattice fringe with a spacing of 0.35 nm as observed under HRTEM (Fig. 1d), which is consistence with and correspond to the (001) planes of crystalline TiO2. The porosity and external structure were measured by BET analysis (Fig. 1e–f), where the N2 adsorption-desorption isotherm can be categorized as type III isotherm considering the absence of the typical distinct hysteresis loop [29]. The result is in accordance with the structural observations. The pore volume of PTNBs is moderate around 0.057 cm3 g−1 because of the ultrathin thickness (Fig. 1b). The specific structure of PTNBs could be ascribed to the formation mechanism,

2.2. Electrode preparation The active materials of PTNBs, conductive carbon of Super P, and binders of polyacrylic acid/carboxymethyl cellulose (PAA-CMC) [26] with the mass ratio of 7.5:1.5:0.5:0.5 were homogeneously mixed in water to form a slurry, which was then casted on the copper foil by doctor blade. After vacuum drying at 80 °C overnight, the foil was punched into circular electrode with a diameter of 14 mm (alternatively Ø16 for full battery). The mass density of active materials is about 2 mg cm−2 with the thickness around at 40–50 μm. Note that a rough comparative lithium storage capability of TiO2 is listed and discussed as one of the reference considering the mass density and thickness of TiO2 is different or lack in different literature. For the preparation of cathodic electrode, the cathodic powders of LiNixMn2-xO4 (x = 0, 0.5) were synthesized first by the sol-gel method [27]. And then, the 54

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Fig. 1. (a) XRD pattern, (b) SEM images, (c) TEM and (d) HRTEM images of PTNBs. Insert of (a) is the typical crystalline structure of anatase TiO2. (e) Nitrogen adsorption-desorption isotherm and (f) pore size distribution of the PTNBs.

1.75 V caused by the surface reactions; (ii) a plateau region around 1.75 V, corresponding to the Li+ intercalation into the crystalline channel of TiO2 (xLi+ + xe− + TiO2 → LixTiO2); (iii) a gradual decayed tail after the voltage plateau region, resulting from the deposition of lithium on electrode surface (Li+ + e− → Li) (Fig. 2a) [31]. An extremely high capacity around 296 mAh g−1 can be achieved in initial hundreds cycles (Fig. 2b), which is much higher than most TiO2 reported before [16–23,32–41], as summarized in Fig. 2c. Furthermore, the capacity retention can maintain around 98.5% after 450 cycles and the CE is almost 100%, indicating the excellent cycle stability of PTNBs. Besides, the CV results also confirm the characteristics and stability of PTNBs (Fig. S1). Note that the observed capacity variation with the “S” curve against cycle number should be ascribed to three combined reasons: i) irreversible reaction (i.e., irreversibility) in initial cycles which is similar as most oxide-based anode; ii) the unique properties of PTNBs (vs. normal TiO2 powders, Fig. S2); iii) the activation of PTNBs-based electrode by PAA/CMC binder (vs. PVDF binder, Fig. S3). Thus, the PTNBs-based electrode experiences a capacity decay in initial cycles, an increased capacity trend as activation and then a final stabilization with a decreased capacity finally. The robust rate capability of PTNBs is further confirmed. High capacities over 272, 243, 219, 187, 149 and 90 mAh g−1 were obtained at the current densities of 50, 100, 200, 400, 800, 1600 and 3200 mA g−1, respectively, where the capacity can recover to 265 mAh g−1 at

where the industrial-grade TiO2 can react with NaOH to form Na2Ti3O7 first, and then it ions-exchange with HAc to form H2Ti3O7 intermediates and finally give rise to anatase TiO2. The ions-exchange reaction is beneficial to construct the porosity and connected small nanocrystals, and the HAc may further facilitate the formation of nanobundles [30]. Note that the new structured TiO2 nanobundles has an interesting phenomenon, where the BJH surface area of pores around 25.2 m2 g−1 is close to the BET surface area of 25.5 m2 g−1, indicating that an open and connection of pores [29]. The unique structure of PTNBs with high surface area, rich porosity and grain boundaries, and moderate pore volume can demonstrate intrinsic unique properties for the wide applications in the fields of photo-catalysis, electrochemistry, sensor, energy storage and environmental science. 3.2. Lithium storage capability of PTNBs The lithium-ions storage ability of PTNBs was evaluated in LIBs versus metallic lithium. An extremely high stability was demonstrated in the galvanostatic charge-discharge curves, in which the voltage vs. capacity profiles associated Ti4+/Ti3+ redox couple (i.e., 1.75 V vs. 2.0 V) almost remains constant over 450 cycles, demonstrating the highly reversible reaction of lithium and TiO2 (Fig. 2a). The reaction in the discharge process can be divided into three main stages: (i) a fast decrease in potential starting from the open-circuit voltage (OCV) to 55

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diffusion constant and highly active TiO2 benefiting from the short diffusion path within nanocrystals, porosity and ultrathin thickness of PTNBs. 3.3. Sustainable full batteries PTNBs is competent as a sustainable and reliable anode because of the rich abundance of elements, non-flammable properties, suitable voltage and particularly the extremely high capacity. Thus, sustainable lithium-ion full batteries were configured though matching the spinel structured LiNixMn1-xO4 (x = 0, 0.5), which is a cobalt-free, cost-effective, more reliable and higher voltage cathode comparing to the layered lithium metal oxide [25]. Cycled charge-discharge curves of PTNBs/LiMn2O4 battery were demonstrated in Fig. 4. A high capacity of 224 mAh ganode−1 (i.e., 112 mAh gLiMn2O4−1) was delivered after a charged capacity of 260 mAh ganode−1 (i.e., 130 mAh gLiMn2O4−1) in the first cycles, giving rise to an initial CE of 85.6% (Fig. 4a, black curve). Later, the following CE can achieve 100%, demonstrating the reversible reaction of lithium-ions within the battery. In detail, the cathodic oxidation of Mn3+/Mn4+ and the reduction of Ti4+/Ti3+ in anode take place via the reaction of LiMn2O4 + TiO2 → 2λ-MnO2 + 2Li0.5TiO2 in the charge process. And then, the discharged long plateau at 2.05 V is ascribed to the extraction of Li+ from the PTNBs (∼1.90 V) and the intercalation of Li+ into the λ-MnO2 lattice (∼3.95 and 4.08 V). This process was confirmed more clearly by the dQ/dv-V curve (Inset of Fig. 4b), in which the pair of redox peaks located at around 2.05/2.18 V are consistence with the voltage difference of LiMn2O4 (i.e., 3.95 and 4.08 V) vs. 1.90 V of PTNBs (Fig. 4a). Note that the PTNBs/LiMn2O4 full cell can deliver a reversible capacity of 223 mA h ganode−1 at 100 mA g−1 with a capacity retention of 99% after 140 cycles (vs. the 10th cycle), where the energy density is as high as 535 Wh kganode−1 (i.e., 267 Wh kgcathode−1). To seek higher energy density, the full battery of PTNBs/ LiNi0.5Mn1.5O4 with the high work voltage of 2.75 V was further demonstrated in Fig. 5. The voltage is about 0.7 V higher that of PTNBs/ LiMn2O4 due to the high Ni4+/Ni3+ redox couple around 4.66 V in LiNi0.5Mn1.5O4 (Fig. 5a). The dQ/dV-V curve exhibits the pair of redox peak located at 2.75/2.95 V (insert in Fig. 5b), which is consistence with the high working voltage characteristic of LiNi0.5Mn1.5O4 [42]. The CE can achieve 90.6% in the first cycle even a dynamic balance existed in battery between anode and cathode, and particularly it can maintain around 99.1% fast as cycling. The battery can deliver a high capacity of 204 mAh ganode−1 (i.e., 102 mAh gcathode−1) at the cut-off voltage of 4.0 V, under which the cycle performance of LiNi0.5Mn1.5O4

Fig. 2. (a) Voltage vs. capacity profiles and (b) cycle performance, coulombic efficiency of PTNBs in lithium battery. (c) A rough comparative capacity of TiO2-based anode in previous literature at the rate of 0.5C.

100 mA g−1 (Fig. 3a). Even further cycling under a hash current density of 1000 mA g−1 (∼6C), the capacity can still be persevered as high as 146 mAh g−1 over 500 cycles with a capacity retention of 80% (Fig. 3b–c). Although the TiO2 have been widely studied as anode in LIB, the performances of such pristine PTNBs, including the capacity (Fig. 2c) and rate capabilities (Fig. 3d), are much better than most TiO2based electrode [32–41], particularly without any elemental doping and modification. The reason should be ascribed to the fast Li+

Fig. 3. Voltage vs. capacity profiles of PTNBs (a) under the current densities of 100–3200 mA g−1 and (b) at the 1000 mA g−1. (c) Corresponding rate capability and cyclic performance of PTNBs in lithium battery. (d) A rough comparative rate capacity of TiO2-based anode in previous literature.


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Fig. 4. (a) Voltage vs. capacity profiles of PTNBs/LiMn2O4 full battery and (b) its cycle performance at 100 mA ganode−1. Inset of (b) is the typical dQ/dV-V curve of PTNBs/LiMn2O4 within the work voltage of 1.5–4.0 V.

Fig. 5. (a) Voltage vs. capacity profiles of PTNBs/LiNi0.5Mn1.5O4 full battery and (b) its cycle performance at 100 mA ganode−1. Inset of (b) is the typical dQ/dV-V curve of PTNBs/LiNi0.5Mn1.5O4 within the work voltage of 2.0–4.0 V.

Fig. 6. Voltage vs. capacity profiles and rate capabilities of (a, b) PTNBs/LiMn2O4 and (c, d) PTNBs/LiNi0.5Mn1.5O4 full batteries at the current densities of 100–1600 mA ganode−1.

210, 182, 145 and 105 mAh ganode−1 at the current densities of 100, 200, 400, 800 and 1600 mA g−1, which can recover to 230 mAh g−1 at 100 mA ganode−1 (Fig. 6a–b). While the capacities of PTNBs/LiNi0.5Mn1.5O4 battery are 203, 172, 130, 50 and 0.2 mAh ganode−1 under the same variation of current densities, and then it can recover to 202 mAh g−1 at 100 mA ganode−1 (Fig. 6c–d). One interesting phenomena is that the rate capability of PTNBs/LiNi0.5Mn1.5O4 battery is a bit inferior comparing to that of PTNBs/LiMn2O4, which should be ascribed to the crystalline channel difference in the spinel structured LiNixMn1-xO4 (x = 0, 0.5) [46]. Nevertheless, the capacities of both full batteries can recover once the current density is reduced, demonstrating the durability of battery system even it is performed under a high current impulse. Note that the working potential of 2.05 and 2.75 V in the presented configuration are comparable or even much higher than current commercial battery systems of Pb-Acid (2.0 V) [47], Ni-Cd (1.5 V) [48], Ni-MH (0.9 V) [49], as well as most aqueous battery system (< 1.5 V) [50]. Comparing to the aforementioned systems involving harmful metallic-ions, the concept of using sustainable, nonflammable and carbon-free PTNBs versus low-cost, cobalt-free spinel structured cathode towards green and advanced battery can satisfy the safety and sustainability issues in rechargeable batteries.

can be persevered well while maximally avoiding the serious structural deterioration and reducing the side reactions (e.g., electrolyte decomposition, Mn2+ dissolution and migration, reconstruction of SEI film). Generally, the structural deterioration and the side reactions of the cathode can be suppressed by using PTNBs comparing to that using carbon anode, because the carbon is not stable as that expected when the battery was charged to a high voltage over 4.0 V [43]. The parasitic reaction products can be created at carbon anode and then induce the “electrode-electrode interactions” [44], under which the deterioration and the side reaction of LiNi0.5Mn1.5O4 would become severe. Note that, the parasitic reaction products created on LiNi0.5Mn1.5O4 can also aggravate the side reactions on carbon anode in turn. By contrast, the PTNBs is more stable than carbon and then the parasitic reaction is reduced, therefore the LiNi0.5Mn1.5O4 can cycle better versus PTNBs. An average capacity of 195 mAh ganode−1 with the capacity retention of 90% (vs. the 10th cycle) was obtained over 140 cycles (Fig. 5a), where the energy density can reach to 540 Wh kganode−1 (e.g., 270 Wh kgcathode−1). Note that the attained capacity is close to 200 mAh g−1 of graphite (vs. LiNi0.4Mn1.6O4) [45], but its safety factor was significantly improved. In the rate test, the capacities of PTNBs/LiMn2O4 battery are 216, 57

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4. Conclusions

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A green and convenient hydrothermal strategy starting from the industrial TiO2 powders was developed to synthesis a porous structured anatase TiO2 nanobundles (PTNBs), and it successfully avoids the using of high-cost and harmful organic titanium compounds, which is feasible for a large-scalable production. The PTNBs can be used as a sustainable anode in lithium (ion) battery, and it exhibits an extremely high lithium storage ability of 296 mAh g−1 at 100 mA g−1, stable cycle performance over 500 cycles and robust rate capability better than most TiO2based materials. Besides, sustainable and safer full LIBs of PTNBs/ LiNixMn1-xO4 (x = 0, 0.5) were configured. The designed batteries have the characteristic of sustainability, and it can deliver high energy capacities satisfying diverse requirements in energy storage systems. The convenient strategy, unique structure and properties of PTNBs have high potential for wider applications, while the concept using sustainable electrodes and seeking reliable system is attractive in energy storages for developing advanced and safe batteries towards commercialization. Acknowledgements This work was supported by the construct program of the key discipline in Hunan province (Applied Chemistry), Hunan Provincial Natural Science Foundation of China (2016JJ3094), Scientific Research Fund of Hunan Provincial Education Department (15C0933, 16C1082) and Startup Foundation for Doctors of Hunan University of Arts and Science. J. Ming is grateful for the support from the King Abdullah University of Science & Technology (Kingdom of Saudi Arabia). H. Ming is grateful for the support from the Natural Science Foundation of China (NSFC: 21703285). Appendix A. Supplementary data Supplementary data related to this article can be found at http://dx. References [1] J.M. Tarascon, M. Armand, Issues and challenges facing rechargeable lithium batteries, Nature 414 (2001) 359–367. [2] N.S. Choi, Z.H. Chen, S.A. Freunberger, X.L. Ji, Y.K. Sun, K. Amine, G. Yushin, L.F. Nazar, J. Cho, P.G. Bruce, Challenges facing lithium batteries and electrical double-layer capacitors, Angew. Chem. Int. Ed. 51 (2012) 9994–10024. [3] S.T. Myung, F. Maglia, K.J. Park, C.S. Yoon, P. Lamp, S.-J. Kim, Y.K. Sun, Nickelrich layered cathode materials for automotive lithium-ion batteries: achievements and perspectives, ACS Energy Lett. 2 (2017) 196–223. [4] Q.S. Wang, P. Ping, X.J. Zhao, G.Q. Chu, J.H. Sun, C.H. Chen, Thermal runaway caused fire and explosion of lithium ion battery, J. Power Sources 208 (2012) 210–224. [5] A.M. Haregewoin, A.S. Wotango, B.J. Hwang, Electrolyte additives for lithium ion battery electrodes: progress and perspectives, Energy Environ. Sci. 9 (2016) 1955–1988. [6] J. Ming, M. Li, P. Kumar, A.Y. Lu, W. Wahyudi, L.J. Li, Redox species-based electrolytes for advanced rechargeable lithium ion batteries, ACS Energy Lett. 1 (2016) 529–534. [7] M.A. Hannan, M.M. Hoque, A. Mohamed, A. Ayob, Review of energy storage systems for electric vehicle applications: issues and challenges, Renew. Sustain. Energy Rev. 69 (2017) 771–789. [8] J. Ming, M. Li, P. Kumar, L.J. Li, Multilayer approach for advanced hybrid lithium battery, ACS Nano 10 (2016) 6037–6044. [9] S. Xin, Y. You, S. Wang, H.-C. Gao, Y.-X. Yin, Y.G. Guo, Solid-state lithium metal batteries promoted by nanotechnology: progress and prospects, ACS Energy Lett. 2 (2017) 1385–1394. [10] J. Groenewald, T. Grandjean, J. Marco, Accelerated energy capacity measurement of lithium-ion cells to support future circular economy strategies for electric vehicles, Renew. Sustain. Energy Rev. 69 (2017) 98–111. [11] R. Zhang, N.W. Li, X.B. Cheng, Y.X. Yin, Q. Zhang, Y.G. Guo, Advanced micro/ nanostructures for lithium metal anodes, Adv. Sci. 4 (2017) 1600445. [12] P. Roy, S.K. Srivastava, Nanostructured anode materials for lithium ion batteries, J. Mater. Chem. A 3 (2015) 2454–2484. [13] J. Ming, Y. Wu, G. Liang, J.-B. Park, F. Zhao, Y.K. Sun, Sodium salt effect on hydrothermal carbonization of biomass: a catalyst for carbon-based nanostructured materials for lithium-ion battery applications, Green Chem. 15 (2013) 2722.


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