High capacity surface-modified LiCoO2 cathodes for lithium-ion batteries

A. M. Kannan; L. Rabenberg; A. Manthiram

doi:10.1149/1.1526782

High capacity surface-modified LiCoO₂ cathodes for lithium-ion batteries

A. M. Kannan, L. Rabenberg, A. Manthiram

Research output: Contribution to journal › Article › peer-review

145 Scopus citations

Abstract

The surface of LiCoO₂ cathodes was modified with Al₂O₃, TiO₂, and ZrO₂ by a chemical processing procedure followed by heat treatment at 300°C in air for 4 h. The surface-modified LiCoO₂ samples show much better capacity retention at both 25 and 60°C than the unmodified LiCoO₂ cathode to higher cutoff charge voltages of as high as 4.7 V vs. lithium. For example, Al₂O₃-modified LiCoO₂ shows approximately 180 mAh/g at 4.5 to 3.2 V with a capacity fade of only 8% in 100 cycles, compared to 32% for the unmodified LiCoO₂. Transmission electron microscopic studies reveal that the guest materials are present as loose oxides (Al₂O₃ and ZrO₂) or as monolayers (TiO₂) on the surface of LiCoO₂ particles. The improved capacity retention and the higher reversible capacity (180 mAh/g) of the surface-modified LiCoO₂ compared to the unmodified LiCoO₂ (140 mAh/g) could be due to a suppression of the chemical and structural instabilities of the charged Li_1-xCoO₂ cathodes and/or reduction of interparticle stresses and strains.

Original language	English (US)
Pages (from-to)	A16-A18
Journal	Electrochemical and Solid-State Letters
Volume	6
Issue number	1
DOIs	https://doi.org/10.1149/1.1526782
State	Published - Jan 1 2003
Externally published	Yes

ASJC Scopus subject areas

Chemical Engineering(all)
Materials Science(all)
Physical and Theoretical Chemistry
Electrochemistry
Electrical and Electronic Engineering

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title = "High capacity surface-modified LiCoO2 cathodes for lithium-ion batteries",

abstract = "The surface of LiCoO2 cathodes was modified with Al2O3, TiO2, and ZrO2 by a chemical processing procedure followed by heat treatment at 300°C in air for 4 h. The surface-modified LiCoO2 samples show much better capacity retention at both 25 and 60°C than the unmodified LiCoO2 cathode to higher cutoff charge voltages of as high as 4.7 V vs. lithium. For example, Al2O3-modified LiCoO2 shows approximately 180 mAh/g at 4.5 to 3.2 V with a capacity fade of only 8% in 100 cycles, compared to 32% for the unmodified LiCoO2. Transmission electron microscopic studies reveal that the guest materials are present as loose oxides (Al2O3 and ZrO2) or as monolayers (TiO2) on the surface of LiCoO2 particles. The improved capacity retention and the higher reversible capacity (180 mAh/g) of the surface-modified LiCoO2 compared to the unmodified LiCoO2 (140 mAh/g) could be due to a suppression of the chemical and structural instabilities of the charged Li1-xCoO2 cathodes and/or reduction of interparticle stresses and strains.",

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AB - The surface of LiCoO2 cathodes was modified with Al2O3, TiO2, and ZrO2 by a chemical processing procedure followed by heat treatment at 300°C in air for 4 h. The surface-modified LiCoO2 samples show much better capacity retention at both 25 and 60°C than the unmodified LiCoO2 cathode to higher cutoff charge voltages of as high as 4.7 V vs. lithium. For example, Al2O3-modified LiCoO2 shows approximately 180 mAh/g at 4.5 to 3.2 V with a capacity fade of only 8% in 100 cycles, compared to 32% for the unmodified LiCoO2. Transmission electron microscopic studies reveal that the guest materials are present as loose oxides (Al2O3 and ZrO2) or as monolayers (TiO2) on the surface of LiCoO2 particles. The improved capacity retention and the higher reversible capacity (180 mAh/g) of the surface-modified LiCoO2 compared to the unmodified LiCoO2 (140 mAh/g) could be due to a suppression of the chemical and structural instabilities of the charged Li1-xCoO2 cathodes and/or reduction of interparticle stresses and strains.

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High capacity surface-modified LiCoO₂ cathodes for lithium-ion batteries

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