期刊
MATERIALS
卷 15, 期 14, 页码 -出版社
MDPI
DOI: 10.3390/ma15144875
关键词
composite membrane; SiO2@PZS nanoparticle; lithium-ion batteries
类别
资金
- Featured Innovation Projects of General Colleges and Universities in Guangdong Province [ZX2022002502]
- National Natural Science Foundation of China [21905097]
- enterprise innovation research program in the lithium battery industry [51414773]
In this study, composite membranes were prepared by synthesizing core-shell silica-polyphosphazene nanoparticles and coating them onto polyethylene micro-porous membranes, addressing the issues of commercial polyolefin separators. The composite membrane showed improved ionic conductivity and discharge capacity.
Commercial polyolefin separators exhibit problems including shrinkage under high temperatures and poor electrolyte wettability and uptake, resulting in low ionic conductivity and safety problems. In this work, core-shell silica-polyphosphazene nanoparticles (SiO2@PZS) with different PZS layer thicknesses were synthesized and coated onto both sides of polyethylene (PE) microporous membranes to prepare composite membranes. Compared to pure silica-coated membranes and PE membranes, the PE-SiO2@PZS composite membrane had higher ionic conductivity. With the increase in the SiO2@PZS shell thickness, the electrolyte uptake, ionic conductivity and discharge capacity gradually increased. The discharge capacity of the PE-SiO2@PZS composite membrane at 8 C rate was 129 mAh/g, which was higher than the values of 107 mAh/g for the PE-SiO2 composite membrane and 104 mAh/g for the PE membrane.
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