Critical Role of Cations in Lithium Sites on Extended Electrochemical Reversibility of Co-Rich Layered Oxide.

Citation data:

Advanced materials (Deerfield Beach, Fla.), ISSN: 1521-4095, Vol: 29, Issue: 21

Publication Year:
2017
Usage 3
Abstract Views 3
Captures 24
Readers 24
Citations 5
Citation Indexes 5
Repository URL:
http://scholarworks.unist.ac.kr/handle/201301/22224
PMID:
28370747
DOI:
10.1002/adma.201605578
Author(s):
Cho, Woongrae; Myeong, Seungjun; Kim, Namhyung; Lee, Sanghan; Kim, Youngki; Kim, Maengsuk; Kang, Seok Ju; Park, Noejung; Oh, Pilgun; Cho, Jaephil
Publisher(s):
Wiley; WILEY-V C H VERLAG GMBH
Tags:
Materials Science; Engineering
article description
Only a very limited amount of the high theoretical energy density of LiCoO as a cathode material has been realized, due to its irreversible deterioration when more than 0.6 mol of lithium ions are extracted. In this study, new insights into the origin of such low electrochemical reversibility, namely the structural collapse caused by electrostatic repulsion between oxygen ions during the charge process are suggested. By incorporating the partial cation migration of LiNiO , which produces a screen effect of cations in the 3b-Li site, the phase distortion of LiCoO is successfully delayed which in turn expands its electrochemical reversibility. This study elucidates the relationship between the structural reversibility and electrochemical behavior of layered cathode materials and enables new design of Co-rich layered materials for cathodes with high energy density.