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Mitigating Swelling of the Solid Electrolyte Interphase using an Inorganic Anion Switch for Low‐temperature Lithium‐ion Batteries

2023; Wiley; Volume: 62; Issue: 16 Linguagem: Inglês

10.1002/anie.202300384

1521-3773

Jia‐Yan Liang, Yanyan Zhang, Sen Xin, Shuang‐Jie Tan, Xin‐Hai Meng, Wenpeng Wang, Ji‐Lei Shi, Zhen‐Bo Wang, Fuyi Wang, Li‐Jun Wan, Yu‐Guo Guo,

Advanced Battery Technologies Research

In overcoming the Li+ desolvation barrier for low-temperature battery operation, a weakly-solvated electrolyte based on carboxylate solvent has shown promises. In case of an organic-anion-enriched primary solvation sheath (PSS), we found that the electrolyte tends to form a highly swollen, unstable solid electrolyte interphase (SEI) that shows a high permeability to the electrolyte components, accounting for quickly declined electrochemical performance of graphite-based anode. Here we proposed a facile strategy to tune the swelling property of SEI by introducing an inorganic anion switch into the PSS, via LiDFP co-solute method. By forming a low-swelling, Li3 PO4 -rich SEI, the electrolyte-consuming parasitic reactions and solvent co-intercalation at graphite-electrolyte interface are suppressed, which contributes to efficient Li+ transport, reversible Li+ (de)intercalation and stable structural evolution of graphite anode in high-energy Li-ion batteries at a low temperature of -20 °C.