Continuous Decomposition of Cobalt Oxides by Iodine-Trimethyl Phosphate Complex during Electrochemical Charge toward Cobalt Recovery,ACS Sustainable Chemistry & Engineering

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Continuous Decomposition of Cobalt Oxides by Iodine-Trimethyl Phosphate Complex during Electrochemical Charge toward Cobalt Recovery
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2021-06-20 , DOI: 10.1021/acssuschemeng.1c01151
Tohru Shiga ₁ , Hiroki Kondo ₁ , Yuichi Kato ₁

Affiliation

Cobalt oxides (CoO and Co₃O₄) are observed in the electrode of spent Li-ion batteries that employ LiCoO₂ as the cathode active material. In this work, a catalytic system to electrochemically decompose CoO and Co₃O₄ was examined to develop a Co reproduction technology. The redox couples for I₂ appear at 3.0 and 3.5 V versus Li⁺/Li; therefore, iodine cannot decompose these cobalt oxides, which have decomposition potentials of 3.874 V for CoO and 3.767 V for Co₃O₄. However, we have previously observed an anomalously high redox couple of I₂ in trimethyl phosphate (TMP). We examined the chemical decomposition of CoO and Co₃O₄ with this iodine species in TMP solution. The decomposition of CoO and Co₃O₄ was successfully demonstrated, which was caused by an increase in the solution acidity, accompanied by balance loss for electric charge between the two iodine atoms due to complexion with a TMP molecule. A double-chamber type cell for Co recovery from CoO or Co₃O₄ was constructed by a combination of CoO or Co₃O₄ decomposition behavior with electrical charging. The cell was first demonstrated to be chargeable by the repeatable decomposition of CoO. However, in contrast, Co₃O₄ powder was not effectively decomposed.

中文翻译：

碘-磷酸三甲酯络合物在电化学充电过程中连续分解钴氧化物以回收钴

在使用 LiCoO ₂作为阴极活性材料的废锂离子电池的电极中观察到钴氧化物（CoO 和 Co ₃ O ₄）。在这项工作中，研究了电化学分解 CoO 和 Co ₃ O ₄的催化系统，以开发 Co 再生技术。I ₂的氧化还原对出现在 3.0 和 3.5 V 与 Li ⁺ /Li 之间；因此，碘不能分解这些钴氧化物，其具有3.874 V代表CoO和3.767 V代表的Co分解电位₃ Ò ₄。然而，我们之前已经观察到异常高的 I ₂氧化还原对在磷酸三甲酯 (TMP) 中。我们检查了 CoO 和 Co ₃ O ₄在 TMP 溶液中用这种碘物质的化学分解。成功证明了 CoO 和 Co ₃ O ₄的分解，这是由溶液酸度的增加引起的，同时由于与 TMP 分子的络合导致两个碘原子之间的电荷平衡损失。从的CoO或Co钴回收的双室型电池₃ ö ₄中的CoO或Co的组合构成₃ ö ₄带电分解行为。该电池首先通过 CoO 的可重复分解被证明是可充电的。然而，相比之下，Co ₃ O ₄粉末没有被有效分解。

更新日期：2021-07-05

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