Pan Zhou, Haiyu Zhou, Yingchun Xia, Qingqing Feng, Xian Kong, Wenhui Hou, Yu Ou, Xuan Song, Hang-Yu Zhou, Weili Zhang, Yang Lu, Fengxiang Liu, Qingbin Cao, Hao Liu, Shuaishuai Yan, Kai Liu
The electrolytes for lithium metal batteries (LMBs) are plagued by a low Li+ transference number (T+) of conventional lithium salts and inability to form a stable solid electrolyte interphase (SEI). Here, we synthesized a self-folded lithium salt, lithium 2-[2-(2-methoxyethoxy)ethoxy]ethanesulfonyl(trifluoromethanesulfonyl) imide (LiETFSI), and comparatively studied with its structure analogue, lithium 1,1,1-trifluoro-N-[2-[2-(2-methoxyethoxy)ethoxy)]ethyl]methanesulfonamide (LiFEA). The special anion chemistry imparts the following new characteristics: i) In both LiFEA and LiETFSI, the ethylene oxide moiety efficiently captures Li+, resulting in a self-folded structure and high T+ around 0...
March 13, 2024: Angewandte Chemie