Premium
Improvement of Cycleability and Rate‐Capability of LiNi 0.5 Co 0.2 Mn 0.3 O 2 Cathode Materials Coated with Lithium Boron Oxide by an Antisolvent Precipitation Method
Author(s) -
Hashigami Satoshi,
Yoshimi Kei,
Kato Yukihiro,
Yoshida Hiroyuki,
Inagaki Toru,
Haruta Masakazu,
Hashinokuchi Michihiro,
Doi Takayuki,
Inaba Minoru
Publication year - 2019
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201900874
Subject(s) - boron , materials science , electrolyte , lithium (medication) , precipitation , oxide , coating , inorganic chemistry , cathode , electrode , chemical engineering , metallurgy , chemistry , composite material , medicine , physics , organic chemistry , meteorology , engineering , endocrinology
LiNi 0.5 Co 0.2 Mn 0.3 O 2 (NCM) particles coated with lithium boron oxide were prepared by an antisolvent precipitation method. In the antisolvent precipitation method, ethanol was used to strip off the hydrated water coordinated with lithium ions and borate ions. By the antisolvent precipitation method, the NCM particles were coated with a uniform layer of LiBO 2 . The capacity fading on cycling was successfully suppressed for the lithium boron oxide‐coated samples. In addition, the rate capability was also improved by the coating. The lithium boron oxide coating effectively suppressed the increase of the electrode impedance associated with the electrolyte decomposition. Crack formation in the secondary particles after charge‐discharge cycling was greatly inhibited for lithium boron oxide‐coated NCM. It was demonstrated that the lithium boron oxide coating layer suppressed the side reactions not only on the particle surface, but also in the intergranular cracks by inhibiting the penetration of the electrolyte solution.