Improvement of leaching efficiency of cathode material of spent LiNixCoyMnzO2 lithium-ion battery by the in-situ thermal reduction
Improvement of leaching efficiency of cathode material of spent LiNixCoyMnzO2 lithium-ion battery by the in-situ thermal reduction
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原位热还原提高废旧LiNixCoyMnzO2锂离子电池正极材料浸出效率
DOI：
10.37190/ppmp/132762
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发表时间：
2021-01
影响因子：
1.5
通讯作者：
Zhang Jing
中科院分区：
文献类型：
--
作者：
Lu Qichang;Jiang Haidi;Xie Weining;Zhang Guangwen;He Yaqun;Duan Chenlong;Zhang Jing
绿色汽车和电子产品消耗大量的锂离子电池（LIBs），并且由于性能下降而产生了大量的废锂电池。本文提出了一种经济环保的从废锂阴极材料中回收有价金属的方法。它结合了原位热还原（由聚偏氟乙烯（PVDF）和正极材料中的残余电解液自还原）和硫酸浸出。在高温下，粘结剂（PVDF）和NCM（LiNixCoyMn1-x-yO2）材料表面残留的电解液对高价元素进行还原。利用x射线衍射（XRD）和x射线光电子能谱（XPS）分析了不同终端温度和保留时间下还原正极材料的物质类型、元素价态和含量的变化。结果表明，原位热还原的最佳终端温度为600℃，最佳保留时间为120 min。在最佳原位热还原条件下，XRD结果证实部分Ni2+转化为单质Ni， Co3+被还原为Co， Mn4+被还原为Mn2+和单质Mn。XPS分析结果表明，Ni2+的含量降至67.05%，Co3+完全还原为Co， Mn4+的含量降至Mn2+的91.41%和单质Mn的8.59%。原位热还原有利于阴极材料的浸出过程。Ni、Co和Mn的浸出效率分别从53.39%、51.95%和0.71%提高到99.04%、96.98%和97.52%。
Green cars and electronic products consume lots of lithium-ion batteries (LIBs), and massive spent LIBs are yielded due to performance degradation. This paper provides an economical and environmentally friendly approach to recover valuable metals from cathode materials of the spent LIBs. It combines the in-situ thermal reduction (self-reduction by polyvinylidene fluoride (PVDF) and residual electrolyte in cathode material) and sulfuric acid leaching. Elements of high valent are reduced by the binder (PVDF) and the residual electrolyte on the surface of NCM(LiNixCoyMn1-x-yO2) material at high temperatures. Moreover, the changes in substance type, element valency, and contents of cathode materials reduced with various terminal temperatures and retention time are analyzed by Xray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). Results show that the optimal terminal temperature for in-situ thermal reduction is 600 °C, and the optimum retention time is 120 min. Under the best in-situ thermal reduction conditions, the results from XRD confirm that part of Ni2+ is converted to simple substance Ni, Co3+ is reduced to Co, and Mn4+ is reduced to Mn2+ and elemental Mn, which are confirmed by XRD. Analyzed results by XPS indicate that the content of Ni2+ decreases to 67.05%, and Co3+ is completely reduced to Co. Mn4+ is reduced to 91.41% of Mn2+ and 8.59% of simple substance Mn. In-situ thermal reduction benefits the leaching processes of cathode materials. The leaching efficiencies of Ni, Co, and Mn increase from 53.39%, 51.95%, and 0.71% to 99.04%, 96.98%, and 97.52%, respectively.
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影响因子：
4.4
作者：
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通讯作者：
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影响因子：
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影响因子：
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作者：
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影响因子：
11.1
作者：
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影响因子：
6.4
作者：
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通讯作者：
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