Facile regeneration of spent lithium-ion battery cathode materials via tunable oxidization and reduction strategy  

可调控氧化还原策略直接修复再生废旧锂电池正极材料

作　　者：Xue-hu ZHONG Wen-qing QIN Jiang ZHOU Jun-wei HAN 钟雪虎;覃文庆;周江;韩俊伟(中南大学资源加工与生物工程学院,长沙410083;中南大学材料科学与工程学院,长沙410083)

机构地区：[1]School of Minerals Processing and Bioengineering,Central South University,Changsha 410083,China [2]School of Materials Science and Engineering,Central South University,Changsha 410083,China

出　　处：《Transactions of Nonferrous Metals Society of China》2025年第2期653-668,共16页中国有色金属学报(英文版)

基　　金：National Natural Science Foundation of China(Nos.52174269,52374293);Science and Technology Innovation Program of Hunan Province,China(Nos.2024CK1009,2022RC1123)。

摘　　要：A tunable oxidization and reduction strategy was proposed to directly regenerate spent LiFePO_(4)/C cathode materials by oxidizing excessive carbon powders with the addition of FePO_(4).Experimental results indicate that spent LiFePO_(4)/C cathode materials with good performance can be regenerated by roasting at 650℃ for 11 h with the addition ofLi_(2)CO_(3),FePO_(4),V_(2)O_(5),and glucose.V_(2)O_(5) is added to improve the cycle performance of regenerated cathode materials.Glucose is used to revitalize the carbon layers on the surface of spent LiFePO_(4)/C particles for improving their conductivity.The regenerated V-doped LiFePO_(4)/C shows an excellent electrochemical performance with the discharge specific capacity of 161.36 mA·h/g at 0.2C,under which the capacity retention is 97.85%after 100 cycles.提出一种通过添加FePO_(4)氧化多余碳的可调控氧化还原方法对废旧LiFePO_(4)/C正极材料进行直接修复再生。修复再生试验表明,将废旧Li FePO_(4)/C正极材料与一定量的Li_(2)CO_(3)、FePO_(4)、V_(2)O_(5)及葡萄糖混合后,将混合料在650℃下焙烧11 h修复后就能得到具有较好性能的正极材料。添加V_(2)O_(5)能够提高修复再生后LiFePO_(4)/C正极材料的循环性能,葡萄糖则通过修复LiFePO_(4)/C表面包覆碳层来提高修复再生后LiFePO_(4)/C的导电性。修复再生后钒掺杂LiFePO_(4)/C正极材料表现出优异的电化学性能,在0.2C倍率下的放电比容量为161.36 m A·h/g,100次循环后容量保持率为97.85%。

关 键 词：spent lithium-ion batteries direct regeneration cathode materials ROASTING circular economy 

分 类 号：TM9[电气工程—电力电子与电力传动]