Author:
Kannan A. M.,Rabenberg L.,Manthiram A.
Abstract
The surface of
LiCoO
2
cathodes was modified with
Al
2
O
3
,
TiO
2
,
and
ZrO
2
by a chemical processing procedure followed by heat treatment at 300°C in air for 4 h. The surface-modified
LiCoO
2
samples show much better capacity retention at both 25 and 60°C than the unmodified
LiCoO
2
cathode to higher cutoff charge voltages of as high as 4.7 V vs. lithium. For example,
Al
2
O
3
-modified
LiCoO
2
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
LiCoO
2
.
Transmission electron microscopic studies reveal that the guest materials are present as loose oxides
(
Al
2
O
3
and
ZrO
2
)
or as monolayers
(
TiO
2
)
on the surface of
LiCoO
2
particles. The improved capacity retention and the higher reversible capacity (180 mAh/g) of the surface-modified
LiCoO
2
compared to the unmodified
LiCoO
2
(140 mAh/g) could be due to a suppression of the chemical and structural instabilities of the charged
Li
1
−
x
CoO
2
cathodes and/or reduction of interparticle stresses and strains. © 2003 The Electrochemical Society. All rights reserved.
Publisher
The Electrochemical Society
Subject
Electrical and Electronic Engineering,Electrochemistry,Physical and Theoretical Chemistry,General Materials Science,General Chemical Engineering
Cited by
164 articles.
订阅此论文施引文献
订阅此论文施引文献，注册后可以免费订阅5篇论文的施引文献，订阅后可以查看论文全部施引文献