Direct Electrochemical Leaching Method for High-Purity Lithium Recovery from Spent Lithium Batteries,Environmental Science & Technology

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Direct Electrochemical Leaching Method for High-Purity Lithium Recovery from Spent Lithium Batteries
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2023-03-07 , DOI: 10.1021/acs.est.3c00287
Liming Yang _{1,

2} , Zhe Gao _{1,

2} , Tian Liu ₃ , Meiting Huang _{1,

2} , Guangzhen Liu _{1,

2} , Yufa Feng _{1,

2} , Penghui Shao _{1,

2} , Xubiao Luo _{1,

2}

Affiliation

Recovering lithium from lithium batteries (LIBs) is a promising approach for sustainable ternary lithium battery (T-LIB) development. Current lithium recovery methods from spent T-LIBs mainly concentrated on chemical leaching methods. However, chemical leaching relying on the additional acid seriously threatens the global environment and nonselective leaching also leads to low Li recovery purity. Here, we first reported a direct electro-oxidation method for lithium leaching from spent T-LIBs (Li_0.8Ni_0.6Co_0.2Mn_0.2O₂); 95.02% of Li in the spent T-LIBs was leached under 2.5 V in 3 h. Meanwhile, nearly 100% Li recovery purity was also achieved, attributed to no other metal leaching and additional agents. We also clarified the relationship between lithium leaching and other metals during the electro-oxidation of spent T-LIBs. Under the optimized voltage, Ni and O maintain the electroneutrality in the structure assisting Li leaching, while Co and Mn maintain their valence states. A direct electro-oxidation Li leaching approach achieves high Li recovery purity and meanwhile overcomes the secondary pollution problem.

中文翻译：

直接电化学浸出法从废旧锂电池中回收高纯锂

从锂电池 (LIB) 中回收锂是可持续发展三元锂电池 (T-LIB) 的一种很有前途的方法。目前从废T-LIBs中回收锂的方法主要集中在化学浸出法。然而，依赖额外酸的化学浸出严重威胁着全球环境，非选择性浸出也导致锂回收纯度低。在这里，我们首先报道了一种从废 T-LIBs (Li _0.8 Ni _0.6 Co _0.2 Mn _0.2 O _{2 )中浸出锂的直接电氧化方法}); 在 2.5 V 电压下 3 小时内，用过的 T-LIB 中 95.02% 的锂被浸出。同时，由于没有其他金属浸出和额外的试剂，也实现了近 100% 的 Li 回收纯度。我们还阐明了废 T-LIBs 电氧化过程中锂浸出与其他金属之间的关系。在优化的电压下，Ni 和 O 在结构中保持电中性，有助于 Li 浸出，而 Co 和 Mn 保持其价态。直接电氧化锂浸出方法实现了高锂回收纯度，同时克服了二次污染问题。

更新日期：2023-03-07

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