Study on annealing treatment of spinel LiNi0.5Mn1.5O4 as cathode materials for high‐voltage lithium‐ion batteries. (1st August 2022)

• Record Type: Journal Article
• Authors: Yang, Wei; Chang, Longjiao; Luo, Shaohua; Bi, Xiaolong; Cao, Shiyuan; Wei, Anlu; Liu, Jianan; Zhang, Fusheng
• Is Part Of: International journal of energy research. Volume 46:Number 13(2022)
• Page Start: 18495
• Page End: 18510
• Publication Date: 2022-08-01
• Subjects: 4.1 V voltage platform -- annealing treatment -- high‐temperature solid‐phase method -- LiNi0.5Mn1.5O4 -- Lithium‐ion batteries; Power resources -- Periodicals; Power (Mechanics) -- Periodicals; Power resources -- Research -- Periodicals; 621.042
• DOI: 10.1002/er.8461
• Languages: English
• ISSNs: 0363-907X

Abstract

Summary: The cathode material LiNi0.5 Mn1.5 O4 has drawn considerable attention for the high‐voltage discharge platform, high power density, and environmental friendliness. However, Mn 3+ inside the material leads to the generation of Ni‐O impurities, which contributes to a 4.1 V voltage platform in the charge‐discharge process. To overcome this phenomenon, spinel LiNi0.5 Mn1.5 O4 was prepared by a high‐temperature solid‐phase method in this article, and samples were annealed after that. Impacts of annealing treatment on properties of LiNi0.5 Mn1.5 O4 were studied and an effective annealing treatment method was proposed. The charge and discharge test shows that the sample treated by annealing at 600°C for 8 h has the highest capacity (121 mAh/g) and the best cycle capacity retention rate (93.4%). XPS tests showed that the treatment by the annealing process significantly reduced the Mn 3+ in the material and eliminated the 4.1 V voltage plateau, which indicates the best annealing process is treating at 600°C for 8 h. Abstract : In this paper, spinel LiNi0.5 Mn1.5 O4 was successfully prepared by high‐temperature solid‐phase method, and the effect of annealing treatment on eliminating the 4.1V voltage plateau of LiNi0.5 Mn1.5 O4 was systematically investigated. The results demonstrate that treatment at 600°C for 8 hours can effectively reduce the content of Mn 3+ in the material, which enhance its electrochemical performance.