Implications of cation-disordered grain boundaries on the electrochemical performance of the LiNi0.5Co0.2Mn0.3O2 cathode material for lithium ion batteries

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Title
Implications of cation-disordered grain boundaries on the electrochemical performance of the LiNi0.5Co0.2Mn0.3O2 cathode material for lithium ion batteries
Author(s)
Jae-Hyun Shim; Jong-San Im; Hyosik Kang; Namchul Cho; Young-Min Kim; Sanghun Lee
Publication Date
2018-09
Journal
JOURNAL OF MATERIALS CHEMISTRY A, v.6, no.33, pp.16111 - 16120
Publisher
ROYAL SOC CHEMISTRY
Abstract
Although lithium-mixed transition metal oxides (LiTM) have promising properties suitable for practical applications, unavoidable cation disorder in their structure during their synthesis or their operation leads to complex effects on their electrochemical performance. The microscopic mechanism of the cation disorder remains elusive owing to the lack of information on the atomic structures with specific chemical identities. In this study, the Li-content-dependent cation disorder phenomenon near the grain boundary of LiNi0.5Co0.2Mn0.3O2 particles is uncovered using atom-resolved chemical and valence mapping techniques. LiTM with 1% excess Li (LiTM101) shows outstanding electrical conductivity at the grain boundary, whereas no enhancement in the electrical conductivity is manifested in LiTM with 7% excess Li. Remarkably, this superior property of LiTM101 is coupled to the combined cation disorder of Ni and Co in the Li layer with their increased valences, while the Mn ions in both samples are not labile to migrate. This work highlights the hitherto hidden role of highly oxidized Co ions in the Li layer as a key agent for enhancing the electrochemical performance, together with Ni ions acting as pillars to stabilize the layered structure, thus providing a new insight for engineering stable and durable cathode materials with high performance. © The Royal Society of Chemistry 2018
URI
https://pr.ibs.re.kr/handle/8788114/5197
ISSN
2050-7488
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > Journal Papers (저널논문)
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