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Origin of Performance Differences of Nickel‐Rich LiNi 0.9 Mn 0.1 O 2 Cathode Materials Synthesized in Oxygen and Air
Author(s) -
Zhang Jiangtao,
Tan Xinghua,
Guo Limin,
Jiang Yi,
Liu Shengnan,
Wang Hanfu,
Kang Xiaohong,
Chu Weiguo
Publication year - 2019
Publication title -
energy technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.91
H-Index - 44
eISSN - 2194-4296
pISSN - 2194-4288
DOI - 10.1002/ente.201800752
Subject(s) - nickel , cobalt , materials science , oxygen evolution , cathode , oxygen , chemical engineering , electrode , electrochemistry , nanotechnology , inorganic chemistry , metallurgy , chemistry , organic chemistry , engineering
Surface state and/or bulk structure, which are determined by different synthesis conditions, have a significant effect on the performance of an electrode material. Distinguishing their individual roles in the performance can provide guidance for the synthesis of high‐performance electrode materials. Cobalt‐free and nickel‐rich LiNi 0.9 Mn 0.1 O 2 , a promising cathode material, is synthesized in air and oxygen to show remarkable differences in both surface state and structure using a facile sol–gel method. Li 2 CO 3 formed at the surface during the synthesis in air results in much poorer performance than in oxygen, which can be significantly improved by the effective removal of Li 2 CO 3 through ultrasonic treatments without changing the bulk structure, morphology, and size. The surface state, instead of bulk structure, morphology, and size‐related elements like more severe cationic mixing and larger secondary particles, is predominantly responsible for the performance difference between the samples synthesized in air and oxygen, which is beyond the conventional viewpoints on layered compounds. This study provides a new perspective for exploring novel synthesis approaches of high‐performance cobalt‐free and nickel‐rich layered compounds.