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Lithium Nitrate Solvation Chemistry in Carbonate Electrolyte Sustains High‐Voltage Lithium Metal Batteries
Author(s) -
Yan Chong,
Yao YuXing,
Chen Xiang,
Cheng XinBing,
Zhang XueQiang,
Huang JiaQi,
Zhang Qiang
Publication year - 2018
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.201807034
Subject(s) - electrolyte , lithium nitrate , ethylene carbonate , inorganic chemistry , anode , dissolution , chemistry , lithium carbonate , dimethyl carbonate , faraday efficiency , carbonate , lithium (medication) , chemical engineering , materials science , ionic bonding , electrode , organic chemistry , ion , catalysis , medicine , engineering , endocrinology
The lithium metal anode is regarded as a promising candidate in next‐generation energy storage devices. Lithium nitrate (LiNO 3 ) is widely applied as an effective additive in ether electrolyte to increase the interfacial stability in batteries containing lithium metal anodes. However, because of its poor solubility LiNO 3 is rarely utilized in the high‐voltage window provided by carbonate electrolyte. Dissolution of LiNO 3 in carbonate electrolyte is realized through an effective solvation regulation strategy. LiNO 3 can be directly dissolved in an ethylene carbonate/diethyl carbonate electrolyte mixture by adding trace amounts of copper fluoride as a dissolution promoter. LiNO 3 protects the Li metal anode in a working high‐voltage Li metal battery. When a LiNi 0.80 Co 0.15 Al 0.05 O 2 cathode is paired with a Li metal anode, an extraordinary capacity retention of 53 % is achieved after 300 cycles (13 % after 200 cycles for LiNO 3 ‐free electrolyte) and a very high average Coulombic efficiency above 99.5 % is achieved at 0.5 C. The solvation chemistry of LiNO 3 ‐containing carbonate electrolyte may sustain high‐voltage Li metal anodes operating in corrosive carbonate electrolytes.