A safe composite cellulose membrane for quasi-solid-state lithium-ion batteries

• DOI: 10.1016/j.nxmate.2024.100266
• Publication Date: 2024-06-07T13:51:51Z
• Authors: Maige Chen; Yuanjian Xu; Mingwen Dong; Keding Chen; Zidong Zhang; Li Yang; Jingchao Chai; Yun Zheng; Yuyu Li; Zhihong Liu; Ming Xie; Wei Zhang
• Keywords: Lithium-ion batteries; Technology; Quasi-solid-state; T; PVDF-HFP; Membrane; Cellulose; 01 natural sciences; LATP; 0104 chemical sciences

Cellulose has advantages of easy availability, low price, renewability and biodegradability, making it a very promising substitute for fossil-based materials. A safe composite cellulose membrane for quasi-solid-state lithium ion batteries has been developed by coating cellulose separators with poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) and lithium aluminum titanium phosphate (LATP). This membrane exhibits excellent electrochemical performance, with an ionic conductivity as high as 2.1 mS cm−1, and a lithium-ion transference number of 0.57. The membrane shows good electrolyte wetting properties, with porosity and liquid electrolyte uptake of 47.2 % and 401.7 %, respectively. It has good thermal stability and can maintain its dimensional stability even at 200 ℃. The capacity retention of the quasi-solid-state LiFePO4/Li battery assembled with this membrane after 200 cycles at 0.2 C is about 86.7 %. The quasi-solid-state battery has good thermal stability and is not prone to thermal runaway.