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The recovery of valuable components from waste ternary lithium batteries and the regeneration of electrode materials were systematically studied. The recovery of valuable components such as Ni, Co, Mn and Li was carried out by using the route of acid leaching—impurity removal—co-precipitation—high temperature solid phase synthesis. The effects of H2SO4 concentration and H2O2 adding dosage on acid leaching were investigated. The pH of the leaching solution was adjusted by NaOH to remove Fe2+ and Al3+ impurities, and then the cathode material precursor of ternary lithium battery was synthesized and the active material of the precursor was regenerated, and the electrochemical properties of the regenerated cathode material were discussed. The results show that the leaching rates of Ni2+, Co2+, Mn2+ and Li+are 99.7%, 99.1%, 97.2% and 99.5%, respectively, using 0.3 mol/L H2SO4 and 8%H2O2 as acid leaching agents. Under the condition of pH=4.5~6.5, it can completely precipitate and remove impurities such as Fe2+ and Al3+, and Ni2+, Co2+ and Mn2+ can be completely precipitated to obtain precursors as the pH rises to 10.0. The cathode material can be regenerated by adding lithium source. The electrochemical performance test results show that at 1 C current density, the specific capacity of ternary lithium battery can reach 143.7 mAh/g for 1 discharge cycle. The performance is stable after 100 cycles, and the CV curve has obvious redox peaks, and the cyclic discharge performance is good at different rates.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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