Resynthesis of LiCo1−xMnxO2 as a cathode material for lithium secondary batteries

• Published in: Metals and materials international Vol. 18; no. 2; pp. 321 - 326
• Main Authors: Kim, Soo-Kyung, Yang, Dong-Hyo, Sohn, Jeong-Soo, Jung, Yong-Chan
• Format: Journal Article
• Language: English
• Published: Springer The Korean Institute of Metals and Materials 01.04.2012; 대한금속·재료학회
• Subjects: Characterization and Evaluation of Materials; Chemistry and Materials Science; Engineering Thermodynamics; Heat and Mass Transfer; Machines; Magnetic Materials; Magnetism; Manufacturing; Materials Science; Metallic Materials; Processes; Solid Mechanics; 재료공학; recycling; energy storage materials; spent lithium ion batteries; transmission electron microscopy; electrochemistry
• ISSN: 1598-9623; 2005-4149
• DOI: 10.1007/s12540-012-2016-4

A recycling process involving chemical, mechanical, and electrochemical steps has been applied to recover cobalt from spent lithium ion batteries and resynthesize cathode active materials. LiCo 1−x Mn x O 2 powders using Co salt including Mn from the leach liquor were resynthesized by solid-state reaction as cathode active materials. When the powder mixture with added Li salt was calcined at 950 °C for 8 hours, well crystallined LiCo 1−x Mn x O 2 was successfully obtained. The LiCo 1−x Mn x O 2 powders with a ratio of Co:Mn=10:1 has a discharge capacity of 156.3 mAh/g at a rate of 20 mA/g with no perceptible capacity loss, in sharp contrast to the pure LiCoO 2 as active materials. The resynthesized LiCo 1−x Mn x O 2 was proven to have good characteristics as cathode active materials in charge/discharge capacity and cyclic performance.