废旧钴酸锂材料Mg/Se共掺直接再生研究  

Direct Regeneration of Waste Lithium Cobalt Oxide Material by Mg/Se Co-Doping

作　　者：张世玲[1] 田乐 孟奇[2] 董鹏[2] ZHANG Shiling;TIAN Le;MENG Qi;DONG Peng(Faculty of Archi tectural Engineering,Kunming Metallurgy College,Kunming 650033,China;Faculty of Metallurgy and Energy Engi neering,Kunming University of Science and Technology,National and Local Joint Engineering Laboratory for Li thium-Ion Batteries and Materials Preparation Technology,Kunming 650093,China)

机构地区：[1]昆明冶金高等专科学校建筑工程学院,昆明650033 [2]昆明理工大学冶金与能源工程学院,锂离子电池及材料制备技术国家地方联合工程研究中心,昆明650093

出　　处：《有色金属(冶炼部分)》2025年第2期185-191,共7页Nonferrous Metals(Extractive Metallurgy)

基　　金：云南省科技重大专项项目(202202AG050003)。

摘　　要：废旧锂离子电池回收利用是新能源电池产业发展的重要环节,废旧正极材料短流程高值再生是重要发展方向。提出了一种高温固相烧结以及Mg/Se共掺杂策略,来解决废旧钴酸锂材料的升级再生难题。主要是将废旧钴酸锂粉末在高温烧结补锂的同时引入掺杂元素,一同实现体相的掺杂改性。研究发现这种直接再生协同掺杂改性的方式可以有助于提高材料的导电性和结构稳定性,从而表现出优异的放电比容量和循环保持率,但并不改变材料的层状结构和颗粒形貌。再生材料在3.0~4.6 V工作电压下,可以释放194.6 mAh/g的首圈比容量,并且循环50圈的容量保持率可以高达71.58%,并且具有优异的大倍率电化学性能,有望为其他废旧正极材料提供新的再生方向。The recycling and utilization of waste lithium-ion batteries is an important part of the development of the new energy battery industry,and the short-term high-value regeneration of waste cathode materials is an important development direction.A high-temperature solid-state sintering and Mg/Se co-doping strategy was proposed to solve the problem of upgrading and regenerating waste lithium cobalt oxide materials.The main method is to introduce doping elements into the lithium supplement of waste lithium cobalt oxide powder during high-temperature sintering to achieve doping modification of the bulk phase.It is found that this direct regeneration synergistic doping modification method can help to improve the conductivity and structural stability of the material,thereby exhibiting excellent discharge specific capacity and cycle retention rate.However,this material will not change the layered structure and particle morphology of the material.The recycled materials can release a first cycle specific capacity of 194.6 mAh/g at working voltage of 3.0-4.6 V,and the capacity retention rate after 50 cycles can reach as high as 71.58%.It also has excellent high-rate electrochemical performance.This strategy is expected to provide a new direction for the regeneration of other waste positive electrode materials.

关 键 词：钴酸锂材料 高电压 结构稳定性 直接再生 掺杂改性 

分 类 号：TF803.2[冶金工程—有色金属冶金]