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New Insights into Structural Evolution of LiNiO2 Revealed by Operando Neutron Diffraction

Journal Article · · Batteries & Supercaps
LiNiO2 (LNO) represents the end member in the compositional space of the LiNi1-x-yMnxCoyO2 (as x and y approach zero) cathode system. Despite its high theoretical specific capacity (275 mAh/g), LNO suffers from phase transitions with large volume change and unfavorable reactions upon electrochemical cycling, which restricts its practical use in the application of lithium-ion batteries. While the contributing factor to the structural instability is commonly linked to the undesired volume collapse associated with the H2-H3 phase transition, detailed analysis of structural evolution following the entire route of phase transitions (H1-M-H2-H3) in real time under battery operating conditions remains a challenging task. In this work, we employ operando neutron diffraction to study the structural changes (crystal lattice, Li/Ni–O bond length, O–Ni–O bond angles, and LiO2/NiO2 layer thickness) of LNO cathode in a home-built LixNiO2 || graphite full cell during Li+ de-/intercalation. In particular, the anomalous increase(decrease) of Ni–O(Li–O) bond length at high SOC (>~85 %) in the H3 phase is discussed in the context of O2- (2p)→Ni4+(3d) negative charge transfer.
Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE; USDOE Office of Energy Efficiency and Renewable Energy (EERE), Transportation Office. Vehicle Technologies Office; USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division
Grant/Contract Number:
AC05-00OR22725; EE0008444
OSTI ID:
1831659
Alternate ID(s):
OSTI ID: 1829365
Journal Information:
Batteries & Supercaps, Journal Name: Batteries & Supercaps Journal Issue: 11 Vol. 4; ISSN 2566-6223
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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