废旧锂离子电池中锰的回收利用

Recycle and reuse of manganese in spent Li-ion battery

采用苹果酸-过氧化氢体系对废旧锂离子电池正极材料Li Ni_(0.5)Co_(0.2)Mn_(0.3)O_2进行浸出,用高锰酸钾溶液氧化沉锰法回收得到二氧化锰(MnO_2),并以葡萄糖为还原剂,采用还原煅烧法进行改性。采用XRD、透射电子显微镜(TEM)和电化学性能测试,研究还原煅烧对回收产物性能的影响。将质量比1∶1的MnO2与C6H12O6在600℃下煅烧3 h,所得产物为碳包覆结构,以0. 1 C倍率在0. 01～3. 00 V循环,首次充电比容量达653 m Ah/g,且具有较理想的循环和倍率性能。

The malic acid and H2O2 system was used for leaching of LiNi0.5 Co0.2Mn0.3O2 cathode materials of spent Li-ion battery, manganese dioxide(MnO2 )was recycled by the oxidation and sedimentation method with potassium permanganate solution,which was modified by the reduced calcination method,with glucose as a reducing agent.'XRD,transmission electron microscopy (TEM) and electrochemical performance tests were employed to investigate the influence of reduced calcination on the performance of recycled products.The MnO2 and C6H12 O6 with mass ratio of 1:1 was calcined 3h at 600%,which had a structure of carbon coating.When charged-discharged in 0.01 -3.00 V at 0.1 C,the initial specific charge capacity reached 653mAh/g and the reused materials showed the ideal cycle performance and rate capability.