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Mediator Catalyst for Lithium Fluoride Decomposition for Lithium Recovery
ACS Sustainable Chemistry & Engineering ( IF 8.4 ) Pub Date : 2020-01-28 , DOI: 10.1021/acssuschemeng.9b06439
Tohru Shiga 1 , Hiroki Kondo 1 , Yuichi Kato 1 , Keiko Fukumoto 1 , Yoko Hase 1
Affiliation  

A catalyst to electrochemically decompose lithium fluoride (LiF), which is abound in the electrode of the spent LiBs, was studied to develop a Li reproduction technology. Since the oxidizing activity of halogen I2, Br2, Cl2, or F2, increases, the reaction I2 + 2LiF → F2 + 2LiI cannot proceed. We examined the catalytic activity of interhalogens such as iodine monobromide (IBr) and iodine chloride (ICl) for LiF decomposition in specific organic solvents. We observed the chemical decomposition of LiF in IBr and ICl dimethyl sulfoxide (DMSO) solutions. This decomposition was induced by an increase in solution acidity, accompanied by a large deviation in the electric charge between two halogen elements due to the complex formation of interhalogen with DMSO. A double-chamber-type cell for Li recovery from LiF was constructed by combining this LiF decomposition behavior with redox coupling of IBr or ICl operated by electrical charging. The cell was first demonstrated to be chargeable due to the continuous decomposition of LiF.

中文翻译:

氟化锂分解回收锂的介体催化剂

研究了一种用于电化学分解废LiBs电极中大量存在的氟化锂(LiF)的催化剂,以开发Li再生技术。由于卤素I 2,Br 2,Cl 2或F 2的氧化活性增加,因此反应I 2 + 2LiF→F 2+ 2LiI无法继续。我们检查了卤素间化合物如一溴化碘(IBr)和氯化碘(ICl)在特定有机溶剂中对LiF分解的催化活性。我们观察到LiF在IBr和ICl二甲基亚砜(DMSO)溶液中的化学分解。这种分解是由于溶液酸度的增加而引起的,这归因于卤素与DMSO的复杂形成,两个卤素元素之间的电荷存在较大偏差。通过将这种LiF分解行为与通过充电操作的IBr或ICl的氧化还原偶联相结合,构建了用于从LiF中回收Li的双室型电池。由于LiF的连续分解,首次证明该电池可充电。
更新日期:2020-01-29
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