Heat treatment of LiCoO₂ recovered from cathode scraps with solvent method

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• 作者：Dawei Song ; Xiaoqing Wang ; Hehe Nie ; Hua Shi ; Dongge Wang ; Fenxia Guo ; Xixi Shi ; Lianqi Zhang
• 关键词：Lithium ion batteries ; Cathode scraps ; Recovery ; Solvent method ; Heat treatment
• 刊名：Journal of Power Sources
• 出版年：1 March, 2014
• 年：2014
• 卷：249
• 期：Complete
• 页码：137-141
• 全文大小：1188 K

文摘

Solvent method was used to recover LiCoO₂ scrap materials, and the effects of heat treatment on the scrap materials for Li-ion battery were investigated in detail. SEM results showed that heat treatment could slightly reduce the degree agglomeration of the scrap materials. XRD results showed that the layer structure of LiCoO₂ was partly destroyed during the recovery process. Low temperature heat treatment could contribute to restore the original layer structure of LiCoO₂, however, high temperature heat treatment could lead to the further damage of the layer structure. Compared with the unheat-treated scrap materials, the discharge capacity and the cycle life of the pristine scrap materials heat-treated at 200聽掳C, 250聽掳C and 300聽掳C were obviously improved, Especially after heat-treated at 250聽掳C, the discharge capacity could reach about 154.6聽mAh聽g^鈭? and the capacity retention rate still remained at 92.0% after 360 cycles. Particle size distribution, tap density and recovery rate of scrap materials were also investigated.