Gel Polymer Electrolytes with High Thermal Stability for Safe Lithium Metal Batteries

被引:0
作者
Chen, Xianhui [1 ]
Wang, Xue [1 ]
Li, Xing [1 ]
Xin, Xing [1 ]
机构
[1] Ningbo Univ, Sch Mat Sci & Chem Engn, Ningbo 315211, Peoples R China
基金
中国国家自然科学基金;
关键词
gel electrolyte; thermal stability; Li dendrites; Li metal batteries; HIGH-PERFORMANCE; LIQUID;
D O I
10.3390/colloids9030030
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The poor thermal stability of polypropylene (PP) separators poses risks of electrolyte leakage and battery short-circuiting, limiting their application in lithium metal batteries (LMBs). To address these challenges, a gel polymer membrane was designed using polymer blending technology. This membrane effectively retains the electrolyte, provides a stable environment, enhances thermal stability, and significantly decreases the risk of battery explosions and side reactions between the lithium metal and the electrolyte. Compared to commercial PP separators, the developed blend-type gel polymer electrolyte (b-GPE) demonstrates a superior performance, including structural stability at temperatures up to 150 degrees C and a high lithium-ion transference number (tLi+) of 0.513. Furthermore, a cell with a LiCoO2 cathode operated at a 1 C rate retains 97.4% of its capacity after 300 cycles. After exposure to 120 degrees C, the b-GPE-120 demonstrates that its performance is comparable to that of the b-GPE, such as a tLi+ of 0.506, a high electrolyte absorption rate, and a wide electrochemical window of 5.2 V.
引用
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页数:15
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