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Title: Adaptive Cation Pillar Effects Achieving High Capacity in Li-Rich Layered Oxide, Li₂MnO₃-LiMeO₂ (Me = Ni, Co, Mn)
Authors: Hiroi, Satoshi
Oishi, Masatsugu
Ohara, Koji
Shimoda, Keiji
Kabutan, Daiki
Uchimoto, Yoshiharu  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0002-1491-2647 (unconfirmed)
Author's alias: 廣井, 慧
大石, 昌嗣
尾原, 幸治
下田, 景士
株丹, 大輝
内本, 喜晴
Keywords: adaptive pillars
cation mixing
Li-rich layered oxides
lithium-ion batteries
pair distribution function
positive electrode materials
X-ray total scattering measurements
Issue Date: 20-Oct-2022
Publisher: Wiley
Journal title: Small
Volume: 18
Issue: 42
Thesis number: 2203412
Abstract: Intensive research is underway to further enhance the performance of lithium-ion batteries (LIBs). To increase the capacity of positive electrode materials, Li-rich layered oxides (LLO) are attracting attention but have not yet been put to practical use. The structural mechanisms through which LLO materials exhibit higher capacity than conventional materials remain unclear because their disordered phases make it difficult to obtain structural information by conventional analysis. The X-ray total scattering analysis reveals a disordered structure consisting of metal ions in octahedral and tetrahedral sites of Li layers as a result of cation mixing after the extraction of Li ions. Metal ions in octahedral sites act as rigid pillars. The metal ions move to the tetrahedral site of the Li layer, which functions as a Li-layer pillar during Li extraction, and returns to the metal site during Li insertion, facilitating Li diffusion as an adaptive pillar. Adaptive pillars are the specific structural features that differ from those of the conventional layered materials, and their effects are responsible for the high capacity of LLO materials. An essential understanding of the pillar effects will contribute to design guidelines for intercalation-type positive electrodes for next-generation LIBs.
Description: リチウムイオン電池正極の低結晶層状構造を支える2種類の支柱. 京都大学プレスリリース. 2022-09-05.
Rights: © 2022 The Authors. Small published by Wiley-VCH GmbH
This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
URI: http://hdl.handle.net/2433/276824
DOI(Published Version): 10.1002/smll.202203412
PubMed ID: 36052573
Related Link: https://www.kyoto-u.ac.jp/ja/research-news/2022-09-05-1
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