废旧锂电池因其具有极高的资源性和危害性成为研究的热点,湿法回收是目前处理废旧锂电正极材料的主要方法,而从废旧正极材料浸出液中回收有价金属元素已成为湿法回收的关键。因此,以废旧锂电池高锰正极材料苹果酸浸出液为原料,通过臭氧...废旧锂电池因其具有极高的资源性和危害性成为研究的热点,湿法回收是目前处理废旧锂电正极材料的主要方法,而从废旧正极材料浸出液中回收有价金属元素已成为湿法回收的关键。因此,以废旧锂电池高锰正极材料苹果酸浸出液为原料,通过臭氧氧化沉淀镍、钴、锰得到最佳沉淀条件,并制备出高锰基前驱体。研究发现:在最佳沉淀条件下,镍、钴、锰的沉淀率分别为18.2%、41.5%、85.8%;臭氧沉淀渣中的镍、钴、锰含量分别为0.85%、1.63%、41.30%。可以看出,该臭氧氧化沉淀渣为高锰基前驱体,前驱体经补锂再生为LiMn_(2)O_(4)正极材料,该正极材料的首次放电比容量为95.4 m A·h/g,首次充放电效率为84%,高倍率下的放电比容量保持率为67.4%,100次循环后的放电比容量保持率为80%。展开更多
A uniform Al-doped LiNi_(0.5)Co_(0.2)Mn_(0.3)O_(2) cathode material was prepared using a coprecipitation method to take advantage of the positive effect of Al on regenerated NCM(Ni,Co,Mn)cathode materials and ameliora...A uniform Al-doped LiNi_(0.5)Co_(0.2)Mn_(0.3)O_(2) cathode material was prepared using a coprecipitation method to take advantage of the positive effect of Al on regenerated NCM(Ni,Co,Mn)cathode materials and ameliorate cumbersome and high-cost impurity removal processes during lithium-ion battery recycling.When the Al^(3+) content in the leachate was 1 at.%with respect to the total amount of transition metals(Ni,Co,and Mn),the produced Al-doped NCM cathode material increased concentrations of lattice oxygen and Ni^(2+).The initial specific capacity at 0.1C was 167.4 mA·h/g,with a capacity retention of 79.1%after 400 cycles at 1C.Further,this Al-doped sample showed improved rate performance and a smaller electrochemical impedance.These findings provide a reference for developing industrial processes to resynthesize cathode materials with improved electrochemical performance by incorporating Al^(3+) impurities produced during lithium-ion battery recycling.展开更多
文摘废旧锂电池因其具有极高的资源性和危害性成为研究的热点,湿法回收是目前处理废旧锂电正极材料的主要方法,而从废旧正极材料浸出液中回收有价金属元素已成为湿法回收的关键。因此,以废旧锂电池高锰正极材料苹果酸浸出液为原料,通过臭氧氧化沉淀镍、钴、锰得到最佳沉淀条件,并制备出高锰基前驱体。研究发现:在最佳沉淀条件下,镍、钴、锰的沉淀率分别为18.2%、41.5%、85.8%;臭氧沉淀渣中的镍、钴、锰含量分别为0.85%、1.63%、41.30%。可以看出,该臭氧氧化沉淀渣为高锰基前驱体,前驱体经补锂再生为LiMn_(2)O_(4)正极材料,该正极材料的首次放电比容量为95.4 m A·h/g,首次充放电效率为84%,高倍率下的放电比容量保持率为67.4%,100次循环后的放电比容量保持率为80%。
基金supported by Anhui Province Research and Development Innovation Project for Automotive Power Battery Efficient Recycling System, China
文摘A uniform Al-doped LiNi_(0.5)Co_(0.2)Mn_(0.3)O_(2) cathode material was prepared using a coprecipitation method to take advantage of the positive effect of Al on regenerated NCM(Ni,Co,Mn)cathode materials and ameliorate cumbersome and high-cost impurity removal processes during lithium-ion battery recycling.When the Al^(3+) content in the leachate was 1 at.%with respect to the total amount of transition metals(Ni,Co,and Mn),the produced Al-doped NCM cathode material increased concentrations of lattice oxygen and Ni^(2+).The initial specific capacity at 0.1C was 167.4 mA·h/g,with a capacity retention of 79.1%after 400 cycles at 1C.Further,this Al-doped sample showed improved rate performance and a smaller electrochemical impedance.These findings provide a reference for developing industrial processes to resynthesize cathode materials with improved electrochemical performance by incorporating Al^(3+) impurities produced during lithium-ion battery recycling.
