1. Polyethylene separator activated by hybrid coating improving Li+ ion transference number and ionic conductivity for Li-metal battery.
- Author
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Mao, Xufeng, Shi, Liyi, Zhang, Haijiao, Wang, Zhuyi, Zhu, Jiefang, Qiu, Zhengfu, Zhao, Yin, Zhang, Meihong, and Yuan, Shuai
- Subjects
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IONIC conductivity , *ELECTRIC conductivity , *POLYETHYLENE synthesis , *LITHIUM-ion batteries , *ENERGY storage - Abstract
Low Li + ion transference number is one fatal defect of the liquid LiPF 6 electrolyte for Li-metal anode based batteries. This work aims to improve Li + ion transference number and ionic conductivity polyethylene (PE) separators. By a simple dip-coating method, the water-borne nanosized molecular sieve with 3D porous structure (ZSM-5) can be coated on PE separators. Especially, the Li + ion transference number is greatly enhanced from 0.28 to 0.44, which should be attributed to the specific pore structure and channel environment of ZSM-5 as well as the interaction between ZSM-5 and electrolyte. Compared with the pristine PE separator, the ionic conductivity of modified separators is remarkably improved from 0.30 to 0.54 mS cm −1 . As results, the C-rate capability and cycling stability are both improved. The Li-metal battery using the ZSM-5-modified PE separator keeps 94.2% capacity after 100 cycles. In contrast, the discharge capacity retention of the battery using pristine PE is only 74.7%. [ABSTRACT FROM AUTHOR]
- Published
- 2017
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