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New Lithium Salt Forms Interphases Suppressing Both Li Dendrite and Polysulfide Shuttling
Author(s) -
Xiao Yinglin,
Han Bing,
Zeng Yi,
Chi ShangSen,
Zeng Xianzhe,
Zheng Zijian,
Xu Kang,
Deng Yonghong
Publication year - 2020
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201903937
Subject(s) - anode , polysulfide , cathode , electrolyte , materials science , electrochemistry , lithium (medication) , salt (chemistry) , dissolution , inorganic chemistry , lithium metal , chemical engineering , electrode , nanotechnology , chemistry , organic chemistry , medicine , engineering , endocrinology
Lithium–sulfur batteries (LSBs) are considered promising candidates for the next‐generation energy‐storage systems due to their high theoretical capacity and prevalent abundance of sulfur. Their reversible operation, however, encounters challenges from both the anode, where dendritic and dead Li‐metal form, and the cathode, where polysulfides dissolve and become parasitic shuttles. Both issues arise from the imperfection of interphases between electrolyte and electrode. Herein, a new lithium salt based on an imide anion with fluorination and unsaturation in its structure is reported, whose interphasial chemistries resolve these issues simultaneously. Lithium 1, 1, 2, 2, 3, 3‐hexafluoropropane‐1, 3‐disulfonimide (LiHFDF) forms highly fluorinated interphases at both anode and cathode surfaces, which effectively suppress formation of Li‐dendrites and dissolution/shuttling of polysulfides, and significantly improves the electrochemical reversibility of LSBs. In a broader context, this new Li salt offers a new perspective for diversified beyond Li‐ion chemistries that rely on a Li‐metal anode and active cathode materials.