以废旧锂离子电池为钴源制备LiCoO_2

Cobalt recovery from spent Li-ion battery to produce LiCoO_2

采用热震法将锂离子电池正极活性物质与铝箔分离,优化热震工艺为：在空气气氛中,550℃下热处理1h后,将正极片快速投到去离子水中,正极活性物质与铝箔的分离效果良好,且铝箔的氧化较少。正极活性物质浸出最佳工艺条件为：浸出液为1.87mol/LH2SO4和0.63mol/LH2O2的混合溶液,浸出温度为75℃、时间为120min,液固比为11ml∶1g。以回收的草酸钴为钴源,LiOH·H2O为锂源制备了LiCoO2。制备的LiCoO2为标准的层状结构,以0.5C在2.8-4.3V充放电,首次和第50次循环的放电比容量分别为146mAh/g、142mAh/g,容量保持率为97%。

Thermal shock method was used to separate cathode active material from aluminum（A1） foil. The optimized processes of thermal shock method was rapidly put cathode plate into distilled water after heat treated at 550℃ for 1 h in air atmosphere. The separation effect of cathode active material from A1 foil was better and the oxidation of Al foil was very few. The optimum conditions for leaching process of cathode active material were：mixture solution of 1.87 mol/L H2SO4 and 0.63 mol/L H2O2 as leach liquor, leaching temperature was 75℃ ,leaching time was 120 min,liquid-solid ratio was 11 ml： 1 g. LiCoO2 material was refabricated by using recovered cobalt oxalate as cobalt source and LiOH. H20 as lithium source. The refabricated LiCoO2 was standard layered structure. When charged-discharged in 2. 8-4. 3 V with 0. 5 C,its specific discharge capacity in the initial and 50th cycle was 146 mAh/g. 142 mAh/g, respectivelv, the canacitv retention rate was 97%.