File Download

There are no files associated with this item.

  • Find it @ UNIST can give you direct access to the published full text of this article. (UNISTARs only)
Related Researcher

김영식

Kim, Youngsik
YK Research
Read More

Views & Downloads

Detailed Information

Cited time in webofscience Cited time in scopus
Metadata Downloads

A novel surface treatment method and new insight into discharge voltage deterioration for high-performance 0.4Li2MnO3-0.6LiNi1/3Co1/3Mn1/3O2 Cathode Materials

Author(s)
Oh, PilgunKo, MinseongMyeong, SeungjunKim, YoungsikCho, Jaephil
Issued Date
2014-11
DOI
10.1002/aenm.201400631
URI
https://scholarworks.unist.ac.kr/handle/201301/5142
Fulltext
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=84911401289
Citation
ADVANCED ENERGY MATERIALS, v.4, no.16, pp.1400631
Abstract
The Li-rich cathode materials have been considered as one of the most promising cathodes for high energy Li-ion batteries. However, realization of these materials for use in Li-ion batteries is currently limited by their intrinsic problems. To overcome this barrier, a new surface treatment concept is proposed in which a hybrid surface layer composed of a reduced graphene oxide (rGO) coating and a chemically activated layer is created. A few layers of GO are first coated on the surface of the Li-rich cathode material, followed by a hydrazine treatment to produce the reducing agent of GO and the chemical activator of the Li2MnO3 phase. Compared to previous studies, this surface treatment provides substantially improved electrochemical performance in terms of initial Coulombic effiency and retention of discharge voltage. As a result, the surface-treated 0.4Li-2MnO3-0.6LiNi1/3Co1/3Mn1/3O2 exhibits a high capacity efficiency of 99.5% during the first cycle a the discharge capacity of 250 mAh g-1 (2.0-4.6 V under 0.1C), 94.6% discharge voltage retention during 100 cycles (1C) and the superior capacity retention of 60% at 12C at 24 °C.
Publisher
WILEY-V C H VERLAG GMBH
ISSN
1614-6832

qrcode

Items in Repository are protected by copyright, with all rights reserved, unless otherwise indicated.