A graphene/PVDF/PP multilayer composite separator for long-life and high power lithium-ion batteries

BU Ai-xiu; TAN Yong; FANG Ruo-pian; LI Feng; PEI Song-feng; REN Wen-cai

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Article Navigation > New Carbon Mater. > 2017 > 32(1): 63-70

BU Ai-xiu, TAN Yong, FANG Ruo-pian, LI Feng, PEI Song-feng, REN Wen-cai. A graphene/PVDF/PP multilayer composite separator for long-life and high power lithium-ion batteries. New Carbon Mater., 2017, 32(1): 63-70.

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A graphene/PVDF/PP multilayer composite separator for long-life and high power lithium-ion batteries

1.
Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110010, China;
2.
Shenyang Ligong University, Shenyang 110159, China

Received Date: 2016-10-20
Accepted Date: 2017-02-25
Rev Recd Date: 2016-12-30
Publish Date: 2017-02-28

Abstract

Abstract

The separator is an important part of lithium-ion batteries and its optimization from both material and structural considerations can improve the performance of the battery. We prepared multilayer separators by coating a slurry containing graphene and PVDF in N-methylpyrrolidone on one side of a commercial polypropylene (PP) separator, followed by water treatment at 60℃ for 6 h and vacuum drying at 60℃ for 12 h to manipulate the pore structure of the composite layer. Results indicate that the discharge capacities of batteries using PP and the composite separator were nearly the same at a low rate of 0.5 C. However, the capacity of the former at a high rate of 5 C fades quickly while that of the latter remains almost unchanged after 600 cycles. The composite separators have a high absorption and wettability of the electrolyte, resulting in an improved conductivity.
- Lithium-ion battery,
- Composite separator,
- Graphene/PVDF coating,
- Pore structure manipulation,
- Ionic conductivity

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References(35)

References

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