期刊
RSC ADVANCES
卷 11, 期 23, 页码 14036-14046出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1ra02641k
关键词
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资金
- National Natural Science Foundation of China [51922099, 21890760]
- Innovation Academy for Light-duty Gas Turbine, Chinese Academy of Sciences [CXYJJ20-MS-05]
- Natural Science Foundation of Hebei Province for Distinguished Young Scholars [E2020103052]
- School Level Cultivation Fund of Beijing Technology and Business University for Distinguished and Excellent Young Scholars
A sandwich gel polymer electrolyte (SGPE) with a thermal shutdown function was developed in this study to address safety issues in lithium-ion batteries. By adjusting the surface pore size, lithium dendrite growth was suppressed and the SGPE demonstrated high safety in overheating conditions. This design also allowed for effective lithium ion transport regulation, resulting in stable lithium anode and promising approach to high safety lithium metal batteries.
Lithium-ion batteries using either liquid electrolytes or solid electrolytes have been extensively studied in recent years, but both of these encounter safety risks such as flammability of liquid electrolytes and uncontrolled dendrite growth. In this study, a sandwich gel polymer electrolyte (SGPE) with a thermal shutdown function was developed to resolve the safety issues. By adjustment of surface pore size of the SGPE, lithium dendrite growth is suppressed. Due to the sandwich structure design, the SGPE can effectively respond to an overheating environment, regulate lithium ion transport and inhibit the penetration of lithium dendrite, demonstrating a remarkably high safety of the batteries, especially at high temperature or under thermal runaway circumstances. In addition, the LiFePO4/SGPE/Li battery exhibits a high reversible capacity of 135 mA h g(-1) at 1C and maintains high capacity retention (>95%) after 200 charge-discharge cycles. This study shows a great advantage to handle thermal abuse and a stable lithium anode, suggesting a promising approach to the high safety lithium metal batteries.
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