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Improving the Cyclic Stability of LiNi 0.5 Mn 1.5 O 4 Cathode by Modifying the Interface Film with 8‐Hydroxyquinoline
Author(s) -
Shang Huimin,
Zhou Hanxiao,
Jingjing Gao,
Zhang Huan,
Li Tianhui,
Qiao Yingjun,
Niu Wenchao,
Qu Meizhen,
Xie Zhengwei,
Peng Gongchang
Publication year - 2021
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.202100754
Subject(s) - electrolyte , cathode , bifunctional , electrochemistry , polarization (electrochemistry) , dissolution , materials science , electrode , thermal stability , chemical engineering , ion , inorganic chemistry , chemistry , biochemistry , organic chemistry , engineering , catalysis
8‐Hydroxyquinoline (8‐HDQN) is used as a bifunctional film‐forming additive to improve the capacity retention of Li/LiNi 0.5 Mn 1.5 O 4 (LNMO) cell. Electrochemical analysis and ex‐situ analysis prove that 8‐HDQN can preferentially oxidize on the surface LNMO cathode to modify the Cathode Electrolyte Interface (CEI) film. The modified film effectively reduces the oxidation reaction of the electrolyte and the increase of polarization during the cycle. The CEI film derived from 8‐HDQN also inhibits the dissolution of transition metals ions from the LNMO electrode, and reduces the self‐discharge of the Li/ LNMO cell. Moreover, 8‐HDQN can also reduce the side reaction of PF 5 by coordination with PF 5 to improve the thermal stability of the electrolyte.