Nitrogen-doped mesoporous carbon nanosheets from coal tar as high performance anode materials for lithium ion batteries

Nitrogen-doped mesoporous carbon nanosheets from coal tar as high performance anode materials for lithium ion batteries

CARBON 8 1 ( 2 0 1 5 ) 8 5 0 –8 5 2 Available at www.sciencedirect.com ScienceDirect journal homepage: www.elsevier.com/locate/carbon New Carbon M...

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CARBON

8 1 ( 2 0 1 5 ) 8 5 0 –8 5 2

Available at www.sciencedirect.com

ScienceDirect journal homepage: www.elsevier.com/locate/carbon

New Carbon Materials 2014(4) – Abstracts Review of carbon materials for advanced lithium–sulfur batteries

priorities for carbon-based materials for lithium-air batteries, and

Qiang Zhang, Xin-bing Cheng, Jia-qi Huang, Hong-jie Peng, Fei

explore the potential applications of carbon-based materials in

Wei

lithium-air batteries.

Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China

[New Carbon Materials 2014, 29(4): 265–271] http://dx.doi.org/10.1016/j.carbon.2014.08.031

Lithium-ion batteries (LIBs) are extensively used in numerous portable devices such as smart-phones and laptops. However,

A review of the electrochemical activity of carbon materials in

current LIBs based on the conventional intercalation mechanism

vanadium redox flow batteries

cannot meet the requirements of the electronics industry and

Guan-jie Wei, Xin-zhuang Fan, Jian-guo Liu, Chuan-wei Yan

electric vehicles although they are approaching their theoretical capacity. Therefore, it is extremely urgent to seek for systems with higher energy densities. Among various promising candidates, lithium–sulfur (Li–S) batteries with a high theoretical capacity are very attractive. However, the commercial use of Li– S batteries still faces obstacles such as the low electrical conductivity of sulfur and lithium sulfide and the dissolution of polysulfides. The introduction of nanocarbon materials into Li–S batteries sheds light on the efficient utilization of sulfur by improving the conductivity of the composites and restraining the shuttle effect of polysulfides. Here, we give a brief review of recent progress on carbon/sulfur composites, especially carbon nanotube-, graphene- and porous carbon-based hybrids, new insights on the relationships between the structure and the electrochemical performance, and propose some important aspects for the future development of Li–S batteries. [New Carbon Materials 2014, 29(4): 241–264] http://dx.doi.org/10.1016/j.carbon.2014.08.030

Carbon-based material for a lithium-air battery Wei Weia, Da-wei Wangb, Quan-hong Yanga a

Key Laboratory for Green Chemical Technology of Ministry of Educa-

tion, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China b

School of Chemical Engineering, University of New South Wales,

Sydney, NSW 2052, Australia Carbon-based materials are important in energy storage and

Liaoning Engineering Research Center for Advanced Battery Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China Carbon materials mainly act as the electrode in a vanadium redox flow battery (VRFB). Due to the poor electrochemical activity of traditional carbon materials for vanadium redox reactions, a comprehensive study of the electrochemical activity of carbon materials, especially graphite felt (GF), is greatly needed and has become an important feature of electrode research. This paper presents research progress on carbon materials for use in a VRFB, focusing on modifying the GF and new carbons as catalysts for vanadium redox reactions. The electrocatalytic influence of surface oxygen and nitrogen functional groups on vanadium redox reactions is introduced. The use of carbon nanotubes and graphene in a VRFB is discussed and future trends to improve the electrochemical activity of carbon materials are highlighted. [New Carbon Materials 2014, 29(4): 272–279] http://dx.doi.org/10.1016/j.carbon.2014.08.032

Nitrogen-doped mesoporous carbon nanosheets from coal tar as high performance anode materials for lithium ion batteries Hao-qiang Wang, Zong-bin Zhao, Meng Chen, Nan Xiao, Bei-bei Li, Jie-shan Qiu Carbon Research Laboratory, Liaoning Key Lab for Energy Materials and Chemical Engineering, State Key Lab of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, China

conversion materials, because of their different possible mor-

Nitrogen-doped mesoporous carbon nanosheets (NMCNs)

phologies and superior performance. We discuss relationships

were prepared from coal tar and melamine using a layered MgO

between the structure and properties of carbon-based materials

as template. Porous structures and nitrogen doping levels were

as the cathode of the lithium-air battery, discuss the importance

readily tuned by adjusting experimental parameters. NMCNs

of structure design and performance control, specify the research

show high specific capacities and excellent cyclic stabilities as

http://dx.doi.org/10.1016/S0008-6223(14)00769-6

CARBON

851

8 1 (2 0 1 5) 8 5 0–85 2

anode materials for lithium ion batteries. A sample prepared

uniform. This can be ascribed to the high thermal conductivity

under optimum conditions shows a high reversible capacity of

of graphene that ensures a uniform temperature distribution on

nearly 1000 mAh/g at a current density of 100 mA/g, which can

the surface of the Si nanoparticles. As an anode material for lith-

be ascribed to its unique mesoporous sheet-structure, a high spe-

ium ion batteries, the [email protected]/G electrode exhibits a high initial cou-

cific surface area of 1209 m2/g, and a uniform and high bulk nitro-

lombic efficiency of 82.7% and an excellent cycling stability with a

gen content of 8.6%. Our work demonstrates that coal tar can act

capacity of 1431 mAh g

as an excellent carbon source for the production of carbon mate-

500 mA g 1. Such excellent electrochemical performance is

rials with high performance in lithium-ion batteries.

attributed to the high electrical conductivity and superior flexibil-

1

after 100 cycles at a current density of

ity of graphene. [New Carbon Materials 2014, 29(4): 280–286] [New Carbon Materials 2014, 29(4): 295–300] http://dx.doi.org/10.1016/j.carbon.2014.08.033 http://dx.doi.org/10.1016/j.carbon.2014.08.035 Carbon nanotube-modified LiFePO4 for high rate lithium ion batteries

Morphology-controlled synthesis of Fe3O4/carbon nanostructures

Wen-bin Luoa,b, Lei Wena, Hong-ze Luoc, Ren-sheng Songa, Yu-

for lithium ion batteries

chun Zhaib, Chang Liua, Feng Lia

Hong-gui Denga, Shuang-ling Jinb, Liang Zhana, Ming-lin Jinb, Li-

a

cheng Linga

Shenyang National Laboratory for Materials Science, Institute of Metal

Research, Chinese Academy of Sciences, Shenyang 110004, China

a

b

Science and Technology, Shanghai 200237, China

School of Materials and Metallurgy, Northeastern University, Shenyang

State Key Laboratory of Chemical Engineering, East China University of

110004, China

b

c

Technology, Shanghai 201418, China

Council for Scientific and Industrial Research, Pretoria 0001, South

Africa

School of Materials Science and Engineering, Shanghai Institute of

Morphology-controlled Fe3O4/carbon nanocomposites were

A hybrid cathode material for high rate lithium ion batteries

synthesized by a solvothermal reaction followed by calcination

was prepared by ball-milling and spray-drying a slurry contain-

under a nitrogen atmosphere. Flower-like structures, dispersed

ing LiFePO4 nanoparticles, glucose and carbon nanotubes (CNTs)

nanoflakes and hollow microspheres could be readily obtained

in water, followed by pyrolysis at 600 °C for 6 h under a gas

by adjusting the concentrations of the reactants. Based on the

mixture of 5% H2in Ar. CNTs with a large aspect ratio form a

time-dependent structure evolution, a possible mechanism for

continuous conductive network connecting the LiFePO4 nano-

the formation of the different morphologies under various condi-

particles and amorphous carbon, which significantly reduces

tions was discussed. The lithium storage properties of the differ-

the electrical resistance of the cathode. The hybrid material

ent Fe3O4/carbon composites were compared. The flower-like

can deliver a specific capacity of 99 mAh/g at a 50 C charge/

sample shows the best electrochemical performance with the

discharge rate. An excellent cycling performance was also

highest specific capacity of 227 mAh/g at a current rate of 5 C

demonstrated, with a capacity loss of less than 10% after 450

while hollow microspheres and dispersed nanoflakes have spe-

cycles at a 10 C rate.

cific capacities of only 45 and 10 mAh/g, respectively.

[New Carbon Materials 2014, 29(4): 287–294]

[New Carbon Materials 2014, 29(4): 301–308]

http://dx.doi.org/10.1016/j.carbon.2014.08.034

http://dx.doi.org/10.1016/j.carbon.2014.08.036

Preparation and lithium storage performance of a carbon-coated

Preparation and electrochemical performance of a graphene-

Si/graphene nanocomposite

wrapped carbon/sulphur composite cathode

Hai Lia,b, Chun-xiang Lua

Fang-fei Lia,b, Wei Lua, Shu-zhang Niua,b, Bao-hua Lia

a

a

National Engineering Laboratory for Carbon Fiber Technology, Institute

Engineering Laboratory for Next Generation Power and Energy Storage

of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China

Batteries, Engineering Laboratory for Functionalized Carbon Materials,

b

Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055,

University of Chinese Academy of Sciences, Beijing 100049, China

China b

A carbon-coated Si/graphene ([email protected]/G) nanocomposite was prepared by dispersing a mixture containing graphene, citric acid,

Laboratory of Advanced Materials, School of Materials, Tsinghua

University, Beijing 100084, China

and Si nanoparticles in ethanol, followed by drying and carbon-

Graphene is used as a barrier film to suppress the “shuttle

ization at 800 °C for 1 h. Transmission electron microscopy

effect” and to improve the performance of activated carbon–sul-

revealed that a carbon layer with a uniform thickness of ca.

phur hybrid cathode materials in a lithium-sulphur battery by

2 nm was formed on the surface of the Si nanoparticles. The

forming a core–shell structure. Graphene wraps around the acti-

[email protected] nanoparticles were supported by graphene sheets with a

vated carbon–sulphur hybrid to form a core–shell structure, in

strong interaction between them. However, the carbon layer on

which the porous carbon framework stores most of the sulphur

the [email protected] nanoparticles without the graphene addition was not

and the graphene layer suppresses the movement of the soluble