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Towards a High‐Performance Lithium‐Metal Battery with Glyme Solution and an Olivine Cathode
Author(s) -
Wei Shuangying,
Inoue Shoichi,
Di Lecce Daniele,
Li Zhenguang,
Tominaga Yoichi,
Hassoun Jusef
Publication year - 2020
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.202000272
Subject(s) - electrolyte , dimethyl ether , lithium (medication) , electrochemistry , materials science , triethylene glycol , lithium battery , inorganic chemistry , cathode , chemical engineering , imide , battery (electricity) , ionic bonding , electrode , chemistry , polymer chemistry , organic chemistry , methanol , ion , medicine , power (physics) , physics , quantum mechanics , engineering , endocrinology
High‐performance lithium‐metal batteries are achieved by using a glyme‐based electrolyte enhanced with a LiNO 3 additive and a LiFePO 4 cathode. An optimal electrolyte formulation is selected upon detailed analysis of the electrochemical properties of various solutions formed by dissolving respectively lithium bis(fluorosulfonyl)imide (LiFSI), lithium bis(trifluoromethanesulfonyl)imide (LiTFSI), and lithium bis(pentafluoroethanesulfonyl)imide (LiBETI) either in diethylene glycol dimethyl ether or in triethylene glycol dimethyl ether and by adding LiNO 3 . A thorough investigation shows evidence of efficient ionic transport, a wide stability window, low reactivity with lithium metal, and cathode/electrolyte interphase characteristics that are strongly dependent on the glyme chain length. The best Li/LiFePO 4 battery delivers 154 mAh g −1 at C/3 (1 C=170 mA g −1 ) without any decay after 200 cycles. Tests at 1 C and 5 C show initial capacities of about 150 and 140 mAh g −1 , a retention exceeding 70 % after 500 cycles, and suitable electrode/electrolyte interphases evolution.