Enhancing Li+ Transport in NMC811||Graphite Lithium‐Ion Batteries at Low Temperatures by Using Low‐Polarity‐Solvent Electrolytes
Bo Nan, Long Chen, Nuwanthi Dilhari Rodrigo, Oleg A. Borodin, Nan Piao, Jiale Xia, Travis P. Pollard, Singyuk Hou, Jiaxun Zhang, Xiao Yuan Ji, Feng Xu, Xiyue Zhang, Lin Ma, Xinzi He, Sufu Liu, Hongli Wan, Enyuan Hu, Weiran Zhang, Kang Xu, Xiao‐Qing Yang, Brett L. Lucht, Chunsheng Wang
Angewandte Chemie International Edition · 2022 · 인용 219
Abstract LiNixCoyMnzO2 (x+y+z=1)||graphite lithium‐ion battery (LIB) chemistry promises practical applications. However, its low‐temperature (≤ −20 °C) performance is poor because the increased resistance encountered by Li+ transport in and across the bulk electrolytes and the electrolyte/electrode interphases induces capacity loss and battery failures. Though tremendous efforts have been made, there is still no effective way to reduce the charge transfer resistance (Rct) which dominates low‐temperature LIBs performance.
Herein, we propose a strategy of using low‐polarity‐solvent electrolytes which have weak interactions between the solvents and the Li+ to reduce Rct, achieving facile Li+ transport at sub‐zero temperatures. The exemplary electrolyte enables LiNi0.8Mn0.1Co0.1O2||graphite cells to deliver a capacity of ≈113 mAh g−1 (98 % full‐cell capacity) at 25 °C and to remain 82 % of their room‐temperature capacity at −20 °C without lithium plating at 1/3C. They also retain 84 % of their capacity at −30 °C and 78 % of their capacity at −40 °C and show stable cycling at 50 °C.