During the reduction roasting of waste ternary Li-ion batteries (LIBs), a large amount of carbon reductant is introduced in the recycling process, which is not conductive to achieve the goal of carbon peaking and carbon neutrality. This research proposes to make full use of aluminum and carbon – main constituents of waste LIBs – as reductants in the roasting process. Results show that the aluminum-carbon reduction roasting method has a higher efficiency compared with the traditional carbon reduction. Lithium present in ternary materials can be almost completely transformed into soluble Li₂CO₃, while the associated Ni, Co and Mn are all converted into insoluble metal elements or their corresponding oxides at 650 °C (t = 90 min). The presence of Al decreases the carbothermal roasting temperature, while the presence of waste carbon allows Li to be converted into easily soluble lithium carbonate in preference to lithium aluminate. The optimal amount of carbon and Al in the spent LIBs were 14.7% and 7.0%, respectively. After roasting, > 97% of Li could be selectively leached by carbonated water leaching, while only < 0.5% of Al, Ni, Co, and Mn dissolved. The leach residues obtained were purified by alkali treatment with 3 mol/L NaOH at 90 °C to achieve > 99% Al separation. These results suggest that the in-situ aluminum-carbon reduction roasting, followed by selective leaching of Li and Al, mitigates several of the challenges related to battery recycling: (i) Li extraction is increased substantially above the state-of-the-art recovery efficiencies, (ii) Al - known to decrease battery metals extraction in hydrometallurgical processing - is selectively removed after making full use of its reducibility and (iii) battery metal-rich residues with low impurity levels is produced for further refining, therefore paving the way towards more economical, efficient and environmentally friendly spent LIBs recycling.

在废旧三元锂离子电池（LIBs）的还原焙烧过程中，回收过程中引入了大量的碳还原剂，不利于实现碳峰化和碳中和的目标。本研究建议充分利用铝和碳——废锂离子电池的主要成分——作为焙烧过程中的还原剂。结果表明，铝碳还原焙烧法与传统碳还原法相比具有更高的效率。三元材料中的锂几乎可以完全转化为可溶性Li ₂ CO ₃, 而伴生的 Ni、Co 和 Mn 在 650 °C (t = 90 min) 下均转化为不溶性金属元素或其相应的氧化物。Al的存在降低了碳热焙烧温度，而废碳的存在使Li优先于铝酸锂转化为易溶解的碳酸锂。废锂离子电池中碳和铝的最佳含量分别为 14.7% 和 7.0%。焙烧后，> 97% 的锂可以通过碳酸水浸出选择性地浸出，而只有 < 0.5% 的 Al、Ni、Co 和 Mn 溶解。获得的浸出残渣在 90 °C 下用 3 mol/L NaOH 进行碱处理，以实现 > 99% 的铝分离。这些结果表明，原位铝碳还原焙烧，然后选择性浸出锂和铝，