| Item type |
文献 / Documents(1) |
| 公開日 |
2020-12-18 |
| アクセス権 |
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アクセス権 |
open access |
| 資源タイプ |
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資源タイプ識別子 |
http://purl.org/coar/resource_type/c_6501 |
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資源タイプ |
journal article |
| 出版社版DOI |
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関連識別子 |
https://doi.org/10.1021/acs.jpcc.0c07124 |
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関連名称 |
10.1021/acs.jpcc.0c07124 |
| 出版タイプ |
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出版タイプ |
AM |
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出版タイプResource |
http://purl.org/coar/version/c_ab4af688f83e57aa |
| タイトル |
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タイトル |
Disordered Cubic Spinel Structure in the Delithiated Li2MnO3 Revealed by Difference Pair Distribution Function Analysis |
| 著者 |
大石, 昌嗣
シモダ, ケイジ
オハラ, コウジ
カブタン, ダイキ
カワグチ, トモヤ
ウチモト, ヨシハル
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| 抄録 |
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内容記述 |
An archetypical Li-rich layered oxide, Li2MnO3, shows a large initial charge capacity of ~350 mAh g-1 with little oxidation of the constituent Mn ions, yet, the crystal structure of delithiated Li2MnO3 is still unclarified because the structural disorder induced by the considerable Li extraction makes the analysis challenging. X-ray pair distribution function (PDF) analysis is a powerful tool to experimentally elucidate the structure of the disordered phase. Here, we conducted a comprehensive analysis with a focus on PDF analysis in combination with the X-ray powder diffraction (XRPD), transmission electron microscopy (TEM), and X-ray absorption spectroscopy (XAS) to reveal the disordered crystalline structure of the electrochemically delithiated Li2MnO3. The XRPD and TEM analyses clarified the formation of a low-crystallinity phase in the light of the average structure. The XAS and PDF analyses further revealed that the MnO6–based framework was rearranged with maintaining the MnO6 octahedral coordination after the initial charge. The difference pair distribution function (d-PDF) technique was therefore employed to extract the structural information of the low-crystallinity disordered phase. The delithiated phase was found to have a structure similar to the cubic spinel, LiMn2O4, rather than that of delithiated LiMn2O4 (λ-MnO2). In addition, the middle-range order of the delithiated phase deteriorated after the charge, indicating a decrease of coherent domain size to a single nm order. The composite structure formed after the first charge, therefore, consists of the disordered cubic spinel structure and unreacted Li2MnO3. The formation of the composite structure “activates” the electrode material structurally and eventually induces characteristic large capacity of this material. |
| 書誌情報 |
en : The Journal of Physical Chemistry C
巻 124,
号 44,
p. 24081-24089,
発行日 2020-10-27
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| 収録物ID |
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収録物識別子タイプ |
ISSN |
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収録物識別子 |
19327447 |
| 収録物ID |
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収録物識別子タイプ |
ISSN |
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収録物識別子 |
19327455 |
| 収録物ID |
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収録物識別子タイプ |
NCID |
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収録物識別子 |
AA1217589X |
| 収録物ID |
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収録物識別子タイプ |
NCID |
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収録物識別子 |
AA12192210 |
| 出版者 |
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出版者 |
ACS Publications |
| 権利情報 |
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|
権利情報 |
This document is the Accepted Manuscript version of a Published Work that appeared in final form in The Journal of Physical Chemistry C, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acs.jpcc.0c07124. |
| EID |
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|
識別子 |
372350 |
| 言語 |
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|
言語 |
eng |
jpcc_124_44_24081.pdf (1.23 MB)
