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Electrochemically induced catalytic adsorption sites in spent lithium-ion battery cathodes for high-rate vanadium redox flow batteries
Journal of Materials Chemistry A ( IF 11.9 ) Pub Date : 2022-08-11 , DOI: 10.1039/d2ta03950h
Jeongmok Park, Hongsoo Jin, Minseong Kim, Haeseong Jang, Minseong Ko

The vanadium redox flow battery (VRFB) is an effective energy storage system that assists a smart grid connected to a renewable energy source. However, the low kinetic reversibility of carbon–based electrodes reduces the activity of VRFB redox reactions, resulting in difficulties in functioning with variable electric power demand. Cathode active materials in spent lithium (Li)-ion batteries (LIBs) through numerous cycles are adopted as electrocatalysts to achieve high-rate VRFBs by improving the electrochemical activity of carbon-based electrodes. Cathode active materials are transition metal oxides that exhibit desirable characteristics for electrochemical reactions through several oxidation states of transition metals and oxygen vacancies. The intrinsic catalytic activity of cathode active materials in spent LIBs is activated by a change in the electronic structure and an increase in the number of oxygen vacancies as active sites. The VRFB single cell with the spent LiFePO4 (SLFP) electrocatalyst operated for 1000 cycles, while that with graphite felt (GF) sharply decreased in capacity after 281 cycles at 300 mA cm−2. This confirmed the high-rate capability of the electrocatalyst. The cathode active materials in spent LIBs exhibited recyclability properties as electrocatalysts, and the catalytic effect was ascribed to internal changes, and may be a feasible strategy for designing electrocatalysts.

中文翻译:

用于高倍率钒氧化还原液流电池的废锂离子电池阴极中的电化学诱导催化吸附位点

钒氧化还原液流电池 (VRFB) 是一种有效的储能系统,可帮助连接到可再生能源的智能电网。然而,碳基电极的低动力学可逆性降低了 VRFB 氧化还原反应的活性,导致在变化的电力需求下难以发挥作用。通过多次循环将废锂 (Li) 离子电池 (LIB) 中的正极活性材料用作电催化剂,通过提高碳基电极的电化学活性来实现高倍率 VRFB。阴极活性材料是过渡金属氧化物,它们通过过渡金属的几种氧化态和氧空位表现出电化学反应所需的特性。废LIB中正极活性材料的内在催化活性是通过电子结构的变化和作为活性位点的氧空位数量的增加来激活的。含废 LiFePO 的 VRFB 单电池4 (SLFP) 电催化剂运行 1000 次循环,而石墨毡 (GF) 电催化剂在 300 mA cm -2下循环 281 次后容量急剧下降。这证实了电催化剂的高倍率性能。废锂离子电池中的正极活性材料作为电催化剂表现出可回收性,催化效果归因于内部变化,可能是设计电催化剂的可行策略。
更新日期:2022-08-11
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