In this study, a controlled carbothermic reduction followed by self-redox leaching process is developed for the stepwise recovery of metals from spent NCM battery. In the controlled carbothermic reduction step, the phase of the product can be precisely regulated simply by controlling the temperature and graphite dosage. In the self-redox leaching step, a redox reaction is carried out between Mn and Co in an H₂SO₄ solution, resulting in the reduction of Co(III) and Co(IV) to Co²⁺, and the Mn(II) is oxidized to MnO₂ solid product for separation. Under the optimized conditions of H₂SO₄ concentration of 3 mol/L, leaching temperature of 85 °C, leaching time of 3 h, and liquid-solid ratio of 6 mL/g, the leaching efficiencies of Li, Ni, and Co reached remarkable levels of 99.2%, 98.9%, and 96.4%, respectively, while Mn mostly exists in the form of a solid phase, with a leaching efficiency of only 2.7%.

在这项研究中，开发了一种受控碳热还原和自氧化还原浸出工艺，用于从废 NCM 电池中逐步回收金属。在可控碳热还原步骤中，只需控制温度和石墨用量即可精确调节产物相。_{在自氧化还原浸出步骤中，Mn 和 Co 在 H 2} SO _4溶液中发生氧化还原反应，导致 Co(III) 和 Co(IV) 还原为 Co ²⁺，而 Mn(II )被氧化成MnO ₂固体产物用于分离。_{在优化的H 2} SO ₄条件下在浓度3 mol/L、浸出温度85 °C、浸出时间3 h、液固比6 mL/g的条件下，Li、Ni、Co的浸出率分别达到99.2%、98.9%。 , 和 96.4%，而 Mn 主要以固相形式存在，浸出效率仅为 2.7%。