以废旧锰酸锂正极为原料制备Li0.25Na0.6MnO2钠离子电池正极材料的研究  

Using spent lithium manganate to prepare Li0.25Na0.6MnO2 as cathode material in sodium-ion batteries

作　　者：聂雪娇 郭晋芝[2] 王美怡 谷振一 赵欣欣 杨旭 梁皓杰 吴兴隆[1,2] NIE Xuejiao;GUO Jinzhi;WANG Meiyi;GU Zhenyi;ZHAO Xinxin;YANG Xu;LIANG Haojie;WU Xinglong(Faculty of Chemistry,Northeast Normal University,Changchun 130024,Jilin,China;Key Laboratory for UV Light-Emitting Materials and Technology of Ministry of Education,Northeast Normal University,Changchun 130024,Jilin,China)

机构地区：[1]东北师范大学化学学院,吉林长春130024 [2]东北师范大学紫外光发射材料与技术教育部重点实验室,吉林长春130024

出　　处：《储能科学与技术》2020年第5期1402-1409,共8页Energy Storage Science and Technology

基　　金：国家自然科学基金重大研究计划(91963118)。

摘　　要：随着锂离子电池(lithium-ion batteries,LIBs)在众多储能领域更大规模的广泛应用,废旧LIBs正在大量地产生,若不进行任何处理而随意丢弃,必将给人类赖以生存的生活环境造成极大的危害,而且也是一种资源浪费。本课题组对废旧LIBs中的锰酸锂正极进行回收和收集,并以此为主要原料,通过球磨和高温烧结相结合的过程,成功合成了钠离子电池(sodium-ion batteries,SIBs)正极材料Li0.25Na0.6MnO2(LNMO),并对其的电化学性能、动力学特性和离子脱嵌导致的相变过程进行了研究。结果显示,LNMO表现出较高的比容量(131.5 mA·h/g)以及优异的倍率性能(容量保持率97.9%),该电极的表观离子扩散系数为10^-12 cm^2/s数量级,表现出快的离子脱嵌能力和动力学过程,是它表现出优异倍率性能的主要原因之一。对废旧锰酸锂材料回收并应用于下一代低成本SIBs中,具有同时实现“废旧LIBs有效回收”和“解决SIBs原料来源”的重要意义。With the widespread application of lithium-ion batteries(LIBs)in many energy storage fields,spent LIBs are being produced in large quantities.Discarding LIBs without any treatment causes great harm to the natural environment on which human beings rely for survival and is a waste of resources.In this paper,we collect lithium manganate cathodes from spent LIBs as the main raw materials.Via a combination of ball milling and high temperature sintering,the sodium-ion battery(SIB)cathode material Li0.25Na0.6MnO2(LNMO)is successfully synthesized;its electrochemical performance,kinetic characteristics,and the phase transition process caused by ion de-insertion are then studied.The results show that LNMO has a high specific capacity(131.5 mA·h/g)and an excellent rate performance(97.9%capacity retention).The apparent ion diffusion coefficient of the electrode is on the order of 10^-12 cm^2/s,showing a fast ion de-insertion ability and kinetic process,which is one of the main reasons for its excellent rate performance.Recycling spent lithium manganate materials and applying them to the next generation of low cost SIBs has the dual significance of simultaneously achieving the effective recycling of spent LIBs and finding a source of raw SIBs materials.

关 键 词：废旧锂离子电池 锰酸锂正极 回收与再利用 钠离子电池 Li0.25Na0.6MnO2 

分 类 号：O646.21[理学—物理化学]