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- Title
Simultaneous Stabilization of Lithium Anode and Cathode using Hyperconjugative Electrolytes for High‐voltage Lithium Metal Batteries.
- Authors
Zhang, Haikuo; Li, Ruhong; Chen, Long; Fan, Yingzhu; Zhang, Hao; Zhang, Ruixin; Zheng, Lei; Zhang, Junbo; Ding, Shouhong; Wu, Yongjian; Ma, Baochen; Zhang, Shuoqing; Deng, Tao; Chen, Lixin; Shen, Yanbin; Fan, Xiulin
- Abstract
Although great progress has been made in new electrolytes for lithium metal batteries (LMBs), the intrinsic relationship between electrolyte composition and cell performance remains unclear due to the lack of valid quantization method. Here, we proposed the concept of negative center of electrostatic potential (NCESP) and Mayer bond order (MBO) to describe solvent capability, which highly relate to solvation structure and oxidation potential, respectively. Based on established principles, the selected electrolyte with 1.7 M LiFSI in methoxytrimethylsilane (MOTMS)/ (trifluoromethyl)trimethylsilane (TFMTMS) shows unique hyperconjugation nature to stabilize both Li anode and high‐voltage cathode. The 4.6 V 30 μm Li||4.5 mAh cm−2 lithium cobalt oxide (LCO) (low N/P ratio of 1.3) cell with our electrolyte shows stable cycling with 91 % capacity retention over 200 cycles. The bottom‐up design concept of electrolyte opens up a general strategy for advancing high‐voltage LMBs.
- Subjects
LITHIUM cells; HIGH voltages; ELECTROLYTES; LITHIUM cobalt oxide; CATHODES; LITHIUM
- Publication
Angewandte Chemie, 2023, Vol 135, Issue 11, p1
- ISSN
0044-8249
- Publication type
Article
- DOI
10.1002/ange.202218970