Title:
POSITIVE ELECTRODE ACTIVE MATERIAL FOR Li ION SECONDARY BATTERIES AND METHOD FOR PRODUCING SAME
Document Type and Number:
WIPO Patent Application WO/2024/004902
Kind Code:
A1
Abstract:
The present invention relates to a positive electrode active material for Li ion secondary batteries, the positive electrode active material being formed of an Li2RuO3 composite oxide that has a layered rock salt-type crystal structure. The Li2RuO3 composite oxide employed in the present invention satisfies the following two conditions: (i) a diffraction peak of the (003) plane of an ilmenite structure appears in the X-ray diffraction pattern after the first full charge; and (ii) 20% to 50% of Ru ions among the Ru ions that constitute the Li2RuO3 composite oxide migrate to the Li ion site after the first full charge. The above-described suitable migration of Ru ions contributes to the retention of the interlayer distance, and enables the achievement of a high cycle performance. This migration of Ru ions was found out by a crystal structure analysis on the basis of the X-ray diffraction patterns in stages of the first charging process.
Inventors:
MASAHIRO YASUSHI (JP)
YABUUCHI NAOAKI (JP)
YABUUCHI NAOAKI (JP)
Application Number:
PCT/JP2023/023469
Publication Date:
January 04, 2024
Filing Date:
June 26, 2023
Export Citation:
Assignee:
TANAKA PRECIOUS METAL IND (JP)
NAT UNIV CORP YOKOHAMA NAT UNIV (JP)
NAT UNIV CORP YOKOHAMA NAT UNIV (JP)
International Classes:
H01M4/485; C01G55/00
Foreign References:
| CN104495959A | 2015-04-08 | |||
| CN104134781A | 2014-11-05 | |||
| JP2016110817A | 2016-06-20 |
Other References:
HAN MIAO, LIU ZEPENG, SHEN XING, YANG LU, SHEN XI, ZHANG QINGHUA, LIU XIAOZHI, WANG JUNYANG, LIN HONG‐JI, CHEN CHIEN‐TE, PAO CHIH‐: "Stacking Faults Hinder Lithium Insertion in Li 2 RuO 3", ADVANCED ENERGY MATERIALS, WILEY - V C H VERLAG GMBH & CO. KGAA, DE, vol. 10, no. 48, 1 December 2020 (2020-12-01), DE , XP093122679, ISSN: 1614-6832, DOI: 10.1002/aenm.202002631
HESTENES JULIA C., ELLS ANDREW W., NAVARRO GOLDARAZ MATEO, SERGEYEV IVAN V., ITIN BORIS, MARBELLA LAUREN E.: "Reversible Deposition and Stripping of the Cathode Electrolyte Interphase on Li2RuO3", FRONTIERS IN CHEMISTRY, FRONTIERS MEDIA, LAUSANNE, vol. 8, Lausanne , XP093122681, ISSN: 2296-2646, DOI: 10.3389/fchem.2020.00681
ZHENG FENG, ZHENG SHIYAO, ZHANG PENG, ZHANG XIAOFENG, WU SHUNQING, YANG YONG, ZHU ZI-ZHONG: "Impact of Structural Transformation on Electrochemical Performances of Li-Rich Cathode Materials: The Case of Li 2 RuO 3", THE JOURNAL OF PHYSICAL CHEMISTRY C, AMERICAN CHEMICAL SOCIETY, US, vol. 123, no. 22, 6 June 2019 (2019-06-06), US , pages 13491 - 13499, XP093122683, ISSN: 1932-7447, DOI: 10.1021/acs.jpcc.9b02887
HESTENES JULIA C., ELLS ANDREW W., NAVARRO GOLDARAZ MATEO, SERGEYEV IVAN V., ITIN BORIS, MARBELLA LAUREN E.: "Reversible Deposition and Stripping of the Cathode Electrolyte Interphase on Li2RuO3", FRONTIERS IN CHEMISTRY, FRONTIERS MEDIA, LAUSANNE, vol. 8, Lausanne , XP093122681, ISSN: 2296-2646, DOI: 10.3389/fchem.2020.00681
ZHENG FENG, ZHENG SHIYAO, ZHANG PENG, ZHANG XIAOFENG, WU SHUNQING, YANG YONG, ZHU ZI-ZHONG: "Impact of Structural Transformation on Electrochemical Performances of Li-Rich Cathode Materials: The Case of Li 2 RuO 3", THE JOURNAL OF PHYSICAL CHEMISTRY C, AMERICAN CHEMICAL SOCIETY, US, vol. 123, no. 22, 6 June 2019 (2019-06-06), US , pages 13491 - 13499, XP093122683, ISSN: 1932-7447, DOI: 10.1021/acs.jpcc.9b02887
Attorney, Agent or Firm:
ORIGINATE IP (JP)
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