期刊
JOURNAL OF MEMBRANE SCIENCE
卷 592, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.memsci.2019.117364
关键词
Lithium-ion battery; Sandwich separator; SiO2 particles; Glass fiber fabric; PVDF-HFP membrane
资金
- Fundamental Research Funds for the Central Universities [2232019G-01]
- National Science Foundation of China [51777208]
The close relationship between separators and the performances of lithium-ion batteries (LIBs) has motivated considerable R&D passions. However, commercial polyolefin-based separators are often limited by their inferior electrolyte wettability and poor thermal stability, whilst advanced polymeric/inorganic separators are confined in laboratory due to the use of expensive starting materials and complicated manufacture process. Here we report a sandwich separator fabricated by continuously sandwiching a glass fiber fabric with two layers of polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP) microporous membranes. SiO2 powders are incorporated in the middle layer to improve thermal stability and suppress dendrite growth. The separator inherits not only robust mechanical strength (>= 20 MPa) and thermal stability (against both long-term heating and combustion) from inorganic fabric, but also high porosity and electrolyte affinity (electrolyte uptake similar to 369%) from polymeric membrane, thus possessing extraordinary electrochemical performances. The existence of SiO2 powders further extends the service life of LIB, in that the discharge capacity retains at 157.7 mA hg(-1) after 100 cycles at 1.0C. More attractively, fabrication of such separators does not require a tedious procedure or sophisticated equipment, and all materials involved are of affordable price, making us anticipate the great commercial potential of this sandwich separator.
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