Syntheses of LiCoO2 Mesocrystals by Topotactic Transformation and Their Electrochemical Properties.

Synthetic routes for LiCoO2 mesocrystals with porous and single-crystalline structures through the topotactic transformation of precursor crystals are developed. Octahedral LiCoO2 frameworks of 4-6 μm in diameter, consisting of 600-800 nm subunits, are obtained from octahedral solid particles of Co2 (OH)3 Cl. Hollow LiCoO2 plates about 600 nm wide and 40 nm thick composed of 100-400 nm subunits are produced from hexagonal disks of β-Co(OH)2 . The LiCoO2 mesocrystals exhibit enhanced charge-discharge cycle stability and rate performance as a cathode material for lithium-ion batteries. The high reactive surface area, owing to the porous framework, and high lithium-ion and electron conductivities, originating from the single-crystalline nature, effectively enhance their electrochemical properties.

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