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- Title
Reduction‐Tolerance Electrolyte Design for High‐Energy Lithium Batteries.
- Authors
Sun, Chuangchao; Li, Ruhong; Weng, Suting; Zhu, Chunnan; Chen, Long; Jiang, Sen; Li, Long; Xiao, Xuezhang; Liu, Chengwu; Chen, Lixin; Deng, Tao; Wang, Xuefeng; Fan, Xiulin
- Abstract
Lithium batteries employing Li or silicon (Si) anodes hold promise for the next‐generation energy storage systems. However, their cycling behavior encounters rapid capacity degradation due to the vulnerability of solid electrolyte interphases (SEIs). Though anion‐derived SEIs mitigate this degradation, the unavoidable reduction of solvents introduces heterogeneity to SEIs, leading to fractures during cycling. Here, we elucidate how the reductive stability of solvents, dominated by the electrophilicity (EPT) and coordination ability (CDA), delineates the SEI formed on Li or Si anodes. Solvents exhibiting lower EPT and CDA demonstrate enhanced tolerance to reduction, resulting in inorganic‐rich SEIs with homogeneity. Guided by these criteria, we synthesized three promising solvents tailored for Li or Si anodes. The decomposition of these solvents is dictated by their EPTs under similar solvation structures, imparting distinct characteristics to SEIs and impacting battery performance. The optimized electrolyte, 1 M lithium bis(fluorosulfonyl)imide (LiFSI) in N‐Pyrrolidine‐trifluoromethanesulfonamide (TFSPY), achieves 600 cycles of Si anodes with a capacity retention of 81 % (1910 mAh g−1). In anode‐free Cu||LiNi0.5Co0.2Mn0.3O2 (NCM523) pouch cells, this electrolyte sustains over 100 cycles with an 82 % capacity retention. These findings illustrate that reducing solvent decomposition benefits SEI formation, offering valuable insights for the designing electrolytes in high‐energy lithium batteries.
- Subjects
LITHIUM cells; ENERGY storage; ELECTRIC batteries; ELECTROLYTES; SOLID electrolytes
- Publication
Angewandte Chemie, 2024, Vol 136, Issue 19, p1
- ISSN
0044-8249
- Publication type
Article
- DOI
10.1002/ange.202400761