稀释剂
溶剂化
钠
化学
金属
无机化学
化学工程
组合化学
有机化学
分子
工程类
作者
Jiaxin Li,Simi Sui,Xunzhu Zhou,Kaixiang Lei,Qiong Yang,Shenxu Chu,Lin Li,Yaohua Zhao,Mei Lin Gu,Shulei Chou,Shijian Zheng
标识
DOI:10.1002/anie.202400406
摘要
Diluents have been extensively employed to overcome the disadvantages of high viscosity and sluggish kinetics of high-concentration electrolytes, but generally do not change the pristine solvation structure. Herein, a weakly coordinating diluent, hexafluoroisopropyl methyl ether (HFME), is applied to regulate the coordination of Na+ with diglyme and anion and form a diluent-participated solvate. This unique solvation structure promotes the accelerated decomposition of anions and diluents, with the construction of robust inorganic-rich electrode-electrolyte interphases. In addition, the introduction of HFME reduces the desolvation energy of Na+, improves ionic conductivity, strengthens the antioxidant, and enhances the safety of the electrolyte. As a result, the assembled Na||Na symmetric cell achieves a stable cycle of over 1800 h. The cell of Na||P'2-Na0.67MnO2 delivers a high capacity retention of 87.3 % with a high average Coulombic efficiency of 99.7 % after 350 cycles. This work provides valuable insights into solvation chemistry for advanced electrolyte engineering.
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