Enhancing Li+ Transport in NMC811||Graphite Lithium‐Ion Batteries at Low Temperatures by Using Low‐Polarity‐Solvent Electrolytes. (20th July 2022)

• Record Type: Journal Article
• Authors: Nan, Bo; Chen, Long; Rodrigo, Nuwanthi D.; Borodin, Oleg; Piao, Nan; Xia, Jiale; Pollard, Travis; Hou, Singyuk; Zhang, Jiaxun; Ji, Xiao; Xu, Jijian; Zhang, Xiyue; Ma, Lin; He, Xinzi; Liu, Sufu; Wan, Hongli; Hu, Enyuan; Zhang, Weiran; Xu, Kang; Yang, Xiao‐Qing; Lucht, Brett; Wang, Chunsheng
• Is Part Of: Angewandte Chemie. Volume 134:Number 35(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-07-20
• Subjects: Inorganic-Rich EEIs -- Li-Plating Free -- Low-Temperature Electrolyte -- NMC811||Graphite -- Weak Ion-Dipole Interactions; Chemistry -- Periodicals; 540
• DOI: 10.1002/ange.202205967
• Languages: English
• ISSNs: 0044-8249

Abstract

Abstract: LiNi x Co y Mn z O2 ( 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 ( R ct ) 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 R ct, achieving facile Li + transport at sub‐zero temperatures. The exemplary electrolyte enables LiNi0.8 Mn0.1 Co0.1 O2 ||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. Abstract : Low‐polarity‐solvent electrolytes (LPSEs) 1) enable the formation of the anion‐derived interphases on both electrodes and 2) have weak interactions between the solvent molecules and Li +, which provide fast Li + transport kinetics and reduced resistance in both charge transfer process and Li + transport in electrode/electrolyte interphases, achieving excellent battery performance under both fast‐charge and low‐temperature conditions.