长寿命及高功率锂离子电池用多孔石墨烯/聚偏氟乙烯功能层复合隔膜

步爱秀; 谭勇; 方若翩; 李峰; 裴嵩峰; 任文才

长寿命及高功率锂离子电池用多孔石墨烯/聚偏氟乙烯功能层复合隔膜

1.
中国科学院金属研究所沈阳国家材料科学国家(联合)实验室, 辽宁沈阳 110010;
2.
沈阳理工大学, 辽宁沈阳 110159

详细信息

通讯作者:
裴嵩峰.E-mail:sfpei@imr.ac.cn;谭勇.E-mail:tanyong@126.com

中图分类号: TB332
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- 被引次数: 0
出版历程
- 收稿日期: 2016-10-20
- 录用日期: 2017-02-25
- 修回日期: 2016-12-30
- 刊出日期: 2017-02-28

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

摘要

摘要: 隔膜是锂离子电池的重要组成部分，对隔膜进行材料及结构的优化可以提高锂离子电池的性能。通过在普通商用聚丙烯（PP）隔膜表面构建多孔石墨烯/聚偏氟乙烯功能层的方式获得了复合隔膜材料，通过涂布及常温液相处理的方法调控涂层的孔隙结构，使复合隔膜对电解液的吸附性能明显提高，功能层使复合隔膜具有优异的离子透过性和单侧（石墨烯层）导电性。与采用普通聚丙烯隔膜相比，功能层复合隔膜在低倍率（0.5 C）下的电极材料容量发挥相当。而在高倍率（5 C）下，功能层复合隔膜下，电池容量发挥非常突出，并且600次循环后的容量保持率接近100%，而采用常规PP隔膜，电池材料则容量快速衰减失效。
- 锂离子电池 /
- 复合隔膜 /
- 石墨烯/聚偏氟乙烯 /
- 孔隙结构调控 /
- 离子电导率
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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参考文献(35)

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