Interface Engineering via Manipulating Solvation Chemistry for Liquid Lithium‐Ion Batteries Operated ≥ 100 °C

溶剂化 锂(药物) 化学 离子 接口(物质) 无机化学 纳米技术 有机化学 材料科学 分子 医学 吉布斯等温线 内分泌学
作者
Peitao Xiao,Hongjing Gao,Yufang Chen,Tao Teng,Xiaoru Yun,Di Lu,Guangmin Zhou,Yun Zhao,Baohua Li,Xing Zhou,Chunman Zheng
出处
期刊:Angewandte Chemie [Wiley]
标识
DOI:10.1002/ange.202410982
摘要

High‐performance and temperature‐resistant lithium‐ion batteries (LIBs), which are able to operate at elevated temperatures (i.e., >60 °C) are highly demanded in various fields, especially in military or aerospace exploration. However, their applications were impeded by the poor electrochemical performance and unsatisfying safety issues, which was induced by the severe side reactions between electrolytes and electrodes at high temperatures. Herein, with the synergetic effects of solvation chemistry and functional additive in the elaborately designed weakly solvating electrolyte, a unique robust organic/inorganic hetero‐interphase, composed of gradient F, B‐rich inorganic components and homogeneously distributed Si‐rich organic components, was successfully constructed on both cathodes and anodes, which would effectively inhibit the constant decomposition of electrolytes and dissolution of transition metal ions. As a result, both cathodes and anodes, without compromising their low‐temperature performance, operate at temperatures ≥100 ℃, with excellent capacity retentions of 96.1 % after 500 cycles and 93.5% after ≥200 cycles, respectively, at 80 ℃. Ah‐level LiCoO2||graphite full cells with a cut‐off voltage of 4.3 V also exhibited superior temperature‐resistance with a capacity retention of 89.9% at temperature as high as 120 ℃. Moreover, the fully charged pouch cells exhibited highly enhanced safety, demonstrating their potentials in practical applications at ultrahigh temperatures.
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