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Nanoscale Zirconium-Abundant Surface Layers on Lithium- and Manganese-Rich Layered Oxides for High-Rate Lithium-Ion Batteries

Cited 32 time in Web of Science Cited 32 time in Scopus
Authors
Ahn, Juhyeon; Kim, Jong Hak; Cho, Byung Won; Chung, Kyung Yoon; Kim, Sangryun; Choi, Jang Wook; Oh, Si Hyoung
Issue Date
2017-12
Citation
Nano Letters, Vol.17 No.12, pp.7869-7877
Keywords
Li- and Mn-rich layered oxidestransition metal segregationsZr-abundant surface layersrate capabilitiesnanoscalecrystallographic facets
Abstract
Battery performance, such as the rate capability and cycle stability Of lithium transition metal oxides, is strongly correlated with the surface properties of active particles. For lithium-rich layered oxides, transition metal segregation in the initial state and migration upon cycling leads to a significant structural rearrangement, which eventually degrades the electrode performance. Here, we show that a fine-tuning of surface chemistry on the particular crystal facet can facilitate ionic diffusion and thus improve the rate capability dramatically, delivering a specific capacity of similar to 110 mAh g(-1) at 30C. This high rate performance is realized by creating a nanoscale zirconium-abundant rock-salt-like surface phase epitaxially grown on the layered bulk. This surface layer is spontaneously formed on the Li+ diffusive crystallographic facets during the synthesis and is also durable upon electrochemical cycling. As a result, Li-ions can move rapidly through this nanoscale surface layer over hundreds of cycles. This study provides a promising new strategy for designing and preparing a high-performance lithium-rich layered oxide cathode material.
ISSN
1530-6984
URI
https://hdl.handle.net/10371/164666
DOI
https://doi.org/10.1021/acs.nanolett.7b04158
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Chemical and Biological Engineering (화학생물공학부)Journal Papers (저널논문_화학생물공학부)
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