The leaching performance and leaching kinetics of LiFePO_(4)(LFP)and Al in Al-bearing spent LFP cathode powder were systematically studied.The effects of temperature(273−368 K),stirring speed(200−950 r/min),reaction t...The leaching performance and leaching kinetics of LiFePO_(4)(LFP)and Al in Al-bearing spent LFP cathode powder were systematically studied.The effects of temperature(273−368 K),stirring speed(200−950 r/min),reaction time(0−240 min),acid-to-material ratio(0.1:1−1:1 mL/g)and liquid-to-solid ratio(3:1−9:1 mL/g)on the leaching process were investigated.The results show that the concentration of reactants and the temperature have a greater impact on the leaching of Al.Under the optimal conditions,leaching efficiencies of LFP and Al are 91.53%and 15.98%,respectively.The kinetic study shows that the leaching of LFP is kinetically controlled by mixed surface reaction and diffusion,with an activation energy of 22.990 kJ/mol;whereas the leaching of Al is only controlled by surface chemical reaction,with an activation energy of 46.581 kJ/mol.A low leaching temperature can effectively suppress the dissolving of Al during the acid leaching of the spent LFP cathode material.展开更多
基金The authors acknowledge the funding support from the Key Deployment Projects of Chinese Academy of Sciences(ZDRW_CN_2020-1)the Sino-German Cooperation Research Project under the Natural Science Foundation of China(51761135108)+1 种基金the German Research Foundation(392417756)the CAS Interdisciplinary Innovation Team.
文摘The leaching performance and leaching kinetics of LiFePO_(4)(LFP)and Al in Al-bearing spent LFP cathode powder were systematically studied.The effects of temperature(273−368 K),stirring speed(200−950 r/min),reaction time(0−240 min),acid-to-material ratio(0.1:1−1:1 mL/g)and liquid-to-solid ratio(3:1−9:1 mL/g)on the leaching process were investigated.The results show that the concentration of reactants and the temperature have a greater impact on the leaching of Al.Under the optimal conditions,leaching efficiencies of LFP and Al are 91.53%and 15.98%,respectively.The kinetic study shows that the leaching of LFP is kinetically controlled by mixed surface reaction and diffusion,with an activation energy of 22.990 kJ/mol;whereas the leaching of Al is only controlled by surface chemical reaction,with an activation energy of 46.581 kJ/mol.A low leaching temperature can effectively suppress the dissolving of Al during the acid leaching of the spent LFP cathode material.
