期刊
JOURNAL OF POWER SOURCES
卷 342, 期 -, 页码 816-824出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2017.01.006
关键词
Li-metal anode; Hybrid coating; Li+ ion transference number; Ionic conductivity
资金
- National Natural Science Foundation of China [21503131]
- Shanghai Municipal Science and Technology Committee [14520722200, 14520500200, 15DZ1201002]
- National Key Technology Research and Development Program of the Ministry of Science and Technology of China [2014BAE12B02]
Low Li+ ion transference number is one fatal defect of the liquid LiPF6 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%. (C) 2017 Elsevier B.V. All rights reserved.
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