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Lithium Nitrate Regulated Sulfone Electrolytes for Lithium Metal Batteries
Author(s) -
Fu Jiale,
Ji Xiao,
Chen Ji,
Chen Long,
Fan Xiulin,
Mu Daobin,
Wang Chunsheng
Publication year - 2020
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.202009575
Subject(s) - electrolyte , sulfolane , cathode , lithium (medication) , anode , lithium nitrate , faraday efficiency , inorganic chemistry , solvation , chemistry , electrochemistry , materials science , ion , chemical engineering , solvent , organic chemistry , ionic bonding , electrode , medicine , engineering , endocrinology
Abstract The electrolytes in lithium metal batteries have to be compatible with both lithium metal anodes and high voltage cathodes, and can be regulated by manipulating the solvation structure. Herein, to enhance the electrolyte stability, lithium nitrate (LiNO 3 ) and 1,1,2,2‐tetrafuoroethyl‐2′,2′,2′‐trifuoroethyl(HFE) are introduced into the high‐concentration sulfolane electrolyte to suppress Li dendrite growth and achieve a high Coulombic efficiency of >99 % for both the Li anode and LiNi 0.8 Mn 0.1 Co 0.1 O 2 (NMC811) cathodes. Molecular dynamics simulations show that NO 3 − participates in the solvation sheath of lithium ions enabling more bis(trifluoromethanesulfonyl)imide anion (TFSI − ) to coordinate with Li + ions. Therefore, a robust LiN x O y −LiF‐rich solid electrolyte interface (SEI) is formed on the Li surface, suppressing Li dendrite growth. The LiNO 3 ‐containing sulfolane electrolyte can also support the highly aggressive LiNi 0.8 Mn 0.1 Co 0.1 O 2 (NMC811) cathode, delivering a discharge capacity of 190.4 mAh g −1 at 0.5 C for 200 cycles with a capacity retention rate of 99.5 %.