Electrochemical Performance of Recycled LiMn_1/3Ni_1/3Co_1/3O₂ Reacted with Molybdenite in Lithium-ion Battery

摘要

The electrochemical performance of as-recovered LiNi_1/3Co_1/3Mn_1/3O₂ containing varying percentage weights of MoS₂ and effect of preparing the powder obtained with dimethyl sulfoxide (DMSO) was investigated. All the powders were calcined at 650 ℃. The SEM images and XRD patterns analysis showed that the powders have well-crystallized particles. From the results, highest electrochemical performance was recorded for powder with 0.4 wt. % MoS₂. Sample pressed before fabrication delivered discharge capacity of 201 mAhg^-1 in the first cycle before sudden drop to 172 mAhg^-1 in the second cycle at a discharge rate of 0.1 C (27.5 mAg^-1). After twenty cycles, it delivered 146 mAhg^-1 with efficiency ratio of 96.6%. For sample fabricated without pressing the slurry after drying, the capacities delivered revealed similar trends as recorded in pressed slurries. Highest charge-transfer resistance was recorded for powder with 0.4 wt. % MoS₂ during AC impedance analysis. The performance recorded revealed that relatively cheap and environmentally compatible DMSO could replace N-methylpyrrolidone in lithium-ion battery formulation.