Nitrogen-doped CMK-3@graphene hybrids as a sulfur host material for use in lithium-sulfur batteries

TANG Xiao-nan; SUN Zhen-hua; ZHUO Shu-ping; LI Feng

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Article Navigation > New Carbon Mater. > 2017 > 32(6): 535-541

TANG Xiao-nan, SUN Zhen-hua, ZHUO Shu-ping, LI Feng. Nitrogen-doped CMK-3@graphene hybrids as a sulfur host material for use in lithium-sulfur batteries. New Carbon Mater., 2017, 32(6): 535-541.

Citation:

TANG Xiao-nan, SUN Zhen-hua, ZHUO Shu-ping, LI Feng. Nitrogen-doped CMK-3@graphene hybrids as a sulfur host material for use in lithium-sulfur batteries. New Carbon Mater., 2017, 32(6): 535-541.

TANG Xiao-nan, SUN Zhen-hua, ZHUO Shu-ping, LI Feng. Nitrogen-doped CMK-3@graphene hybrids as a sulfur host material for use in lithium-sulfur batteries. New Carbon Mater., 2017, 32(6): 535-541.

Citation:

TANG Xiao-nan, SUN Zhen-hua, ZHUO Shu-ping, LI Feng. Nitrogen-doped CMK-3@graphene hybrids as a sulfur host material for use in lithium-sulfur batteries. New Carbon Mater., 2017, 32(6): 535-541.

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Nitrogen-doped CMK-3@graphene hybrids as a sulfur host material for use in lithium-sulfur batteries

1.
School of Chemical Engineering, Shandong University of Technology, Zibo 255049, China;
2.
Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

Funds: Natural Science Foundation of Shandong Province (2015ZRB01765).

Received Date: 2017-10-25
Accepted Date: 2017-12-28
Rev Recd Date: 2017-12-05
Publish Date: 2017-12-28

Abstract

Abstract

Sulfur as a cathode material has the advantages of low cost, high theoretical energy density and safety. However, the capacity decay and a shuttle effect are major problems that cause poor coulombic efficiency and a short cycling life. An ordered mesoporous carbon, CMK-3 was oxidized by 67% HNO₃, added to a graphene oxide suspension, sonicated, freeze-dried and annealed in NH₃ to obtain a nitrogen-doped CMK-3@graphene hybrid, which was melt-infiltrated with sulfur to prepare a cathode material for lithium-sulfur batteries. Results indicate that the CMK-3 particles are uniformly dispersed in graphene sheets and their surfaces are coated with graphene. The N-(CMK-3@G)/S has a reversible discharge capacity of 867.3 mAh·g^-1 after 300 cycles at a current density of 335 mA·g^-1 with a capacity retention of 82%. Compared with N-CMK-3/S and N-G/S cathodes, the rate performance and polarization characteristics are also improved. The graphene coating on CMK-3 traps soluble polysulfides during the charge/discharge process and nitrogen doping facilitates chemical adsorption of polysulfides to inhibit the shuttle effect, which together improve the performance of the battery.
- Complementary functions,
- CMK-3,
- Graphene,
- Physical adsorption,
- Chemical adsorption

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References(32)

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