File Download

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

조재필

Cho, Jaephil
Nano Energy Storage Material Lab.
Read More

Views & Downloads

Detailed Information

Cited time in webofscience Cited time in scopus
Metadata Downloads

High-Performance Heterostructured Cathodes for Lithium-Ion Batteries with a Ni-Rich Layered Oxide Core and a Li-Rich Layered Oxide Shell

Author(s)
Oh, PilgunOh, Seung-MinLi, WangdaMyeong, SeunjunCho, JaephilManthiram, Arumugam
Issued Date
2016-11
DOI
10.1002/advs.201600184
URI
https://scholarworks.unist.ac.kr/handle/201301/20759
Fulltext
http://onlinelibrary.wiley.com/doi/10.1002/advs.201600184/abstract
Citation
ADVANCED SCIENCE, v.3, no.11, pp.1600184
Abstract
The Ni-rich layered oxides with a Ni content of >0.5 are drawing much attention recently to increase the energy density of lithium-ion batteries. However, the Ni-rich layered oxides suffer from aggressive reaction of the cathode surface with the organic electrolyte at the higher operating voltages, resulting in consequent impedance rise and capacity fade. To overcome this difficulty, we present here a heterostructure composed of a Ni-rich LiNi0.7Co0.15Mn0.15O2 core and a Li-rich Li1.2-xNi0.2Mn0.6O2 shell, incorporating the advantageous features of the structural stability of the core and chemical stability of the shell. With a unique chemical treatment for the activation of the Li2MnO3 phase of the shell, a high capacity is realized with the Li-rich shell material. Aberration-corrected scanning transmission electron microscopy (STEM) provides direct evidence for the formation of surface Li-rich shell layer. As a result, the heterostructure exhibits a high capacity retention of 98% and a discharge- voltage retention of 97% during 100 cycles with a discharge capacity of 190 mA h g(-1) (at 2.0-4.5 V under C/3 rate, 1C = 200 mA g(-1)).
Publisher
WILEY-BLACKWELL
ISSN
2198-3844
Keyword
VOLTAGE FADEENERGY DENSITYCAPACITYELECTRODESNICKELCHEMISTRYEVOLUTIONROLES

qrcode

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