匣钵在煅烧制备三元正极材料LiNi x Co y Mn z O 2(LNCM)过程中易遭受电池正极材料中Li 2O等的渗透侵蚀,而镁铝尖晶石具有良好的高温性能和抗碱侵蚀性能。通过实验室混合反应法研究了镁铝尖晶石与LNCM正极材料前驱体混合试样在800~1100...匣钵在煅烧制备三元正极材料LiNi x Co y Mn z O 2(LNCM)过程中易遭受电池正极材料中Li 2O等的渗透侵蚀,而镁铝尖晶石具有良好的高温性能和抗碱侵蚀性能。通过实验室混合反应法研究了镁铝尖晶石与LNCM正极材料前驱体混合试样在800~1100℃的反应,对不同温度煅烧后混合试样的物相组成和微观结构进行了分析。探究了镁铝尖晶石作为匣钵基质的可能性。研究了加入不同质量分数(3%、6%和9%)镁铝尖晶石细粉对匣钵材料强度及抗热震性能的影响。结果表明:含镁铝尖晶石细粉的匣钵适用煅烧温度低于1000℃的LNCM正极材料的制备,加入量为6%(w)时,能够提高莫来石质匣钵材料的抗热震性能。展开更多
Substantial environmental and economic benefits can be achieved by recycling used lithium-ion batteries. Hydrometallurgy is often employed to recover waste LiNi_(x)Co_(y)Mn_(z)O_(2) cathode materials. As Ni, Co and Mn...Substantial environmental and economic benefits can be achieved by recycling used lithium-ion batteries. Hydrometallurgy is often employed to recover waste LiNi_(x)Co_(y)Mn_(z)O_(2) cathode materials. As Ni, Co and Mn are transition metals, they exhibit similar properties;therefore, separating them is difficult. Thus, most researchers have focused on leaching processes, while minimal attention has been devoted to the separation of valuable metals from waste LiNi_(x)Co_(y)Mn_(z)O_(2) cathode materials. Herein, we propose an environment-friendly, gentle process involving the usage of pyrometallurgy and hydrometallurgy to gradually leach valuable metals and effectively separate them. Interestingly, Li is recovered through a reduction roasting and water leaching process using natural graphite powder, Ni and Co are recovered through ammonia leaching and extraction processes and Mn is recovered through acid leaching and evaporation–crystallization processes. Results show that ~87% Li, 97.01% Co, 97.08% Ni and 99% Mn can be leached using water, ammonia and acid leaching processes. The result obtained using the response surface methodology shows that the concentration of (NH4)2SO3 is a notable factor affecting the leaching of transition metals. Under optimal conditions, ~97.01% Co, 97.08% Ni and 0.64% Mn can be leached out. The decomposition of LiNi_(x)Co_(y)Mn_(z)O_(2) is a two-step process. This study provides valuable insights to develop an environment-friendly, gentle leaching process for efficiently recycling valuable metals, which is vital for the lithium-ion battery recycling industry.展开更多
基金Projects(51134007,21003161,21250110060) supported by the National Natural Science Foundation of ChinaProject(11MX10) supported by Central South University Annual Mittal-Founded Innovation ProjectProject(2011ssxt086) supported by Fundamental Research Funds for the Central Universities,China
文摘匣钵在煅烧制备三元正极材料LiNi x Co y Mn z O 2(LNCM)过程中易遭受电池正极材料中Li 2O等的渗透侵蚀,而镁铝尖晶石具有良好的高温性能和抗碱侵蚀性能。通过实验室混合反应法研究了镁铝尖晶石与LNCM正极材料前驱体混合试样在800~1100℃的反应,对不同温度煅烧后混合试样的物相组成和微观结构进行了分析。探究了镁铝尖晶石作为匣钵基质的可能性。研究了加入不同质量分数(3%、6%和9%)镁铝尖晶石细粉对匣钵材料强度及抗热震性能的影响。结果表明:含镁铝尖晶石细粉的匣钵适用煅烧温度低于1000℃的LNCM正极材料的制备,加入量为6%(w)时,能够提高莫来石质匣钵材料的抗热震性能。
基金supported by supported by Yunnan Major Scientific and Technological Projects(China)(No.202202AG050003).
文摘Substantial environmental and economic benefits can be achieved by recycling used lithium-ion batteries. Hydrometallurgy is often employed to recover waste LiNi_(x)Co_(y)Mn_(z)O_(2) cathode materials. As Ni, Co and Mn are transition metals, they exhibit similar properties;therefore, separating them is difficult. Thus, most researchers have focused on leaching processes, while minimal attention has been devoted to the separation of valuable metals from waste LiNi_(x)Co_(y)Mn_(z)O_(2) cathode materials. Herein, we propose an environment-friendly, gentle process involving the usage of pyrometallurgy and hydrometallurgy to gradually leach valuable metals and effectively separate them. Interestingly, Li is recovered through a reduction roasting and water leaching process using natural graphite powder, Ni and Co are recovered through ammonia leaching and extraction processes and Mn is recovered through acid leaching and evaporation–crystallization processes. Results show that ~87% Li, 97.01% Co, 97.08% Ni and 99% Mn can be leached using water, ammonia and acid leaching processes. The result obtained using the response surface methodology shows that the concentration of (NH4)2SO3 is a notable factor affecting the leaching of transition metals. Under optimal conditions, ~97.01% Co, 97.08% Ni and 0.64% Mn can be leached out. The decomposition of LiNi_(x)Co_(y)Mn_(z)O_(2) is a two-step process. This study provides valuable insights to develop an environment-friendly, gentle leaching process for efficiently recycling valuable metals, which is vital for the lithium-ion battery recycling industry.
