journal article·2024-05-13

Enhancing the Structural Stability of LiCoO2 at Elevated Voltage via High-Valence Sb Doping

Zhanyi Jia, Peichen Yang, Yongqi Li, Denglei Gao, Jing Xia, Yijun Yang, Xi Wang, Yongan Yang

ACS Applied Energy Materials· Volume 7· Issue 9
Publisher page

Abstract

Elevating the charging cutoff voltage of lithium cobalt oxide (LiCoO 2 ) batteries to 4.6 V (vs Li/Li + ) enables the attainment of an impressive specific capacity; however, this advancement is hampered by severe structural degradation above 4.45 V attributed to unfavorable phase transitions and the occurrence of undesirable side reactions. Herein, we introduce high-valence Sb 5+ into LiCoO 2, suppressing the O3 to H1–3 phase transition and thereby enhancing the structural stability of LiCoO 2 . The stable structure not only enables the formation of a more stable cathode-electrolyte interphase film on the surface of LiCoO 2 but also suppresses the dissolution of Co, reducing surface side reactions. As a result, Sb-doped LiCoO 2, serving as a 4.6 V anode, exhibited a remarkable specific capacity of 169.2 mAh g –1 at a current density of 1C, with a durable capacity retention of 83.2% after 100 cycles. This study offers a structural modulation strategy for the further advancement of high-voltage LiCoO 2 cathodes.
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Research context

OpenAlex topics: Advancements in Battery Materials · Semiconductor materials and interfaces · Advanced Battery Materials and Technologies

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, P. R. China

Institute of Molecular Plus, Tianjin University, Tianjin 300072, P. R. China

College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, P. R. China

Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province (IKKEM), Xiamen 361102, P. R. China

Key Laboratory of Luminescence and Optical Information, Ministry of Education, School of Physical Science and Engineering, Beijing Jiaotong University, Beijing 100044, P. R. China

Funding

Science and Technology Planning Project of Guangdong Province · Ministry of Science and Technology of the People's Republic of China · China Postdoctoral Science Foundation · Fundamental Research Funds for the Central Universities

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