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Suppressing detrimental phase transitions via tungsten doping of LiNiO2 cathode for next-generation lithium-ion batteries

Title
Suppressing detrimental phase transitions via tungsten doping of LiNiO2 cathode for next-generation lithium-ion batteries
Author
윤종승
Keywords
ELECTROCHEMICAL PROPERTIES; NI-RICH; CAPACITY; LIXNIO2
Issue Date
2019-08
Publisher
ROYAL SOC CHEMISTRY
Citation
JOURNAL OF MATERIALS CHEMISTRY A, v. 7, no. 31, Page. 18580-18588
Abstract
A series of W-doped (1.0, 1.5, and 2.0 mol%) LiNiO2 cathodes was synthesized to systematically investigate the stabilization effect of W doping. The 2 mol% W-LiNiO2 cathode delivered 195.6 mA h g(-1) even after 100 cycles at 0.5C, which was 95.5% of its initial capacity. The capacity retention of LiNiO2 cycled under the same conditions was 73.7%. In situ X-ray diffraction analysis of the cathodes during charging showed that the W doping protracted the deleterious phase transition to the extent that the two-phase reaction (H2 -> H3) merged into a single phase; thus, the phase transition proceeded through a solid-solution-like reaction. The significantly enhanced cycling stability due to W doping largely originated from the reduction of the structural stress associated with the repetitive phase transition caused by the reduction of the abrupt lattice collapse/expansion. The effect of the reduced lattice distortion together with the W-rich surface phase and cation ordering greatly stabilized the LiNiO2 structure during cycling, making W-doped LiNiO2 a candidate material for practical high-energy density cathodes.
URI
https://pubs.rsc.org/en/content/articlelanding/2019/TA/C9TA06402H#!divAbstracthttps://repository.hanyang.ac.kr/handle/20.500.11754/152092
ISSN
2050-7488; 2050-7496
DOI
10.1039/c9ta06402h
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > MATERIALS SCIENCE AND ENGINEERING(신소재공학부) > Articles
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