Thermal Runaway Suppression of High-Energy Lithium-Ion Batteries by Designing the Stable Interphase
Changjun Wu, Yu Wu, Xinying Yang, Tianjiao Xin, Siqi Chen, Min Yang, Yong Peng, Hui Xu, Yanli Yin, Tao Deng, Xuning Feng
Abstract
Battery thermal runaway (TR) hinders the safe application of high-energy lithium-ion batteries with high-nickel cathodes. The use of non-flammable perfluorinated electrolytes is a promising alternative for enhancing the thermal stability of the battery and inhibiting the occurrence of TR. Herein, the electrochemical and thermal performances of single-crystal LiNi0.8Co0.1Mn0.1O2 (SC-NCM811) cathode cells based on a perfluorinated electrolyte were investigated. A conventional electrolyte was selected for comparison. It was found that the capacity of the battery cycling in the perfluorinated electrolyte was as high as 110.12% after 200 cycles. In addition, the test results demonstrate that the perfluorinated electrolyte can increase the trigger temperature of TR by 12.5 °C, decrease the highest temperature of TR by 41.2 °C, and reduce the oxygen release and crack formation. After characterizing the single-crystal cathode in a fully charged state, it can be confirmed that a uniform F, B-rich cathode electrolyte interphase can enhance the battery performance to some extent. This study provides a novel direction for addressing the thermal safety issues of high-nickel lithium-ion batteries.