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Electrochemical process for recovery of metallic Mn from waste LiMn_(2)O_(4)-based Li-ion batteries in NaCl−CaCl_(2)melts

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International Journal of Minerals,Metallurgy and Materials 2022年第3期29卷 473-478页

作者： Jinglong Liang Dongbin Wang Le Wang Hui Li Weigang Cao Hongyan Yan College of Metallurgy and Energy North China University of Science and TechnologyTangshan 063210China

new method is proposed for the recovery of Mn via the direct electrochemical reduction of LiMn_(2)O_(4) from the waste of lithium-ion batteries in NaCl−CaCl_(2) melts at 750°C.The results show that the LiMn_(2)O_(4) reduction process by the electrochemical method on the coated electrode surface occurs in three steps:Mn(IV)→Mn(III)→Mn(II)→Mn.The products of this electro-deoxidation are CaMn2O4,MnO,(MnO)x(CaO)1−x,and Mn.Metal Mn appears when the electrolytic voltage increases to 2.6 V,which indicates that increasing the voltage may promote the deoxidation reaction process.With the advancement of the three-phase interline(3PI),electric deoxygenation gradually proceeds from the outer area of the crucible to the core.At high voltage,the kinetic process of the reduction reaction is accelerated,which generates double 3PIs at different stages.

关键词： lithium-ion-battery waste electrochemistry of melts Mn recovery electro-deoxidation lithium manganate

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Challenges and modification strategies of high-voltage cathode materials for Li-ion batteries

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Chinese Journal of Structural Chemistry 2023年第10期42卷 67-79页

作者： Yue Wang Caixia Xu Xingtao Tian Siyu Wang Yan Zhao Institute of NBC Defense PLA ArmyBeijing102205China School of Energy and Power Engineering Jiangsu UniversityZhenjiang212013China

Li-ion batteries(LIBs)have gained wide recognition as effective energy storage devices and power supply sources due to their exceptional volumetric energy density,mass energy density and cycling performance.The cathode materials,a key component of LIBs,play a crucial role in determining the electrochemical performance of these batteries.Therefore,there is an increasing demand to explore and investigate suitable high-energy electrode materials that can provide greater capacity and output voltage for the next generation of LIBs.This paper aims to provide a comprehensive overview of the latest researches on five typical high-voltage cathode materials.Specifically,this review will focus on the detailed analysis of their crystalline structures,reaction mechanisms during cycling,current research status and strategies aimed at improving or enhancing their overall electrochemical performance.Overall,the insights presented in this review will help researchers design and develop high-energy cathode materials with improved performance for the next generation of LIBs.

关键词： Research advances Li-ion batteries lithium iron phosphate Layered cathode lithium-rich oxides lithium manganate

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