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Title: Discovery of a high-pressure phase of rutile-like CoO2 and its potential as a cathode material

Journal Article · · Journal of Materials Chemistry. A
DOI:https://doi.org/10.1039/c8ta05840g· OSTI ID:1610321

Due to the structural failure of layered CoO2, there has been considerable effort to improve the reversible capacity of commercial LiCoO2 cathode materials. Using a global structural search, we have discovered a rutile-like CoO2 phase as the ground state at 50 GPa. The material is thermally, mechanically and dynamically stable, even after removing the pressure. We show that, when lithiated, this LiCoO2 material can serve as an improved cathode material for Li-ion batteries. Its many advantages include good structural stability against transition metal migration and oxygen loss, one-dimensional channels for Li ion diffusion with variable energy barriers (0.36–0.86 eV), enhanced ionic mobility, and good intrinsic electronic conductivity brought about by its metallic band structure. Furthermore, with a voltage platform of 3.2–3.8 V, it provides better stability against conventional carbonate solvents than conventional layered cathode materials (>4.0 V). All these features demonstrate that the non-layered CoO2 phase synthesized at high pressure would be a promising cathode material, providing a performance beyond that of the currently used layered phase.

Research Organization:
Virginia Commonwealth Univ., Richmond, VA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
FG02-96ER45579
OSTI ID:
1610321
Alternate ID(s):
OSTI ID: 1466069
Journal Information:
Journal of Materials Chemistry. A, Vol. 6, Issue 38; ISSN 2050-7488
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 7 works
Citation information provided by
Web of Science

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Cited By (2)

A high-pressure induced stable phase of Li 2 MnSiO 4 as an effective poly-anion cathode material from simulations journal January 2019
Diversities of stoichiometry and electrical conductivity in sodium sulfides journal January 2019

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