废旧三元锂电正极材料再生制备P2/P3/尖晶石-NMNC复合钠电正极材料  

Recycled P2/P3-NMNC Cathode for Sodium-Ion Batteries from Waste Ternary Cathode in Lithium-Ion Batteries

作　　者：张继享 ZHANG Jixiang(Center of Fujian Solid Waste and Chemical Environmental Management Technology,Fuzhou 350003,China)

机构地区：[1]福建省固体废物及化学品环境管理技术中心,福建福州350003

出　　处：《福建师范大学学报（自然科学版）》2024年第6期63-70,共8页Journal of Fujian Normal University：Natural Science Edition

基　　金：国家重点研发计划项目(2019YFC1904500);福建省生态环境厅项目(2021R024)。

摘　　要：为应对当前锂资源匮乏,以丰度更高的钠替代锂,将废旧锂离子电池三元材料回收再生制备钠离子电池。合成P2相钠电三元正极材料(P表示钠离子为三棱柱配位,最小氧原子的密堆积重复为2),对其进行不同晶相的复合,提高P2相三元正极材料倍率性能。通过改变钠含量,在P2相基础上进行多相复合。电化学测试结果表明,合成的P2/P3/尖晶石相材料在0.2 C电流密度下循环50圈容量为165 mA·h·g^(-1),相比复合前提升43.5%,容量保持率高达91.9%;在2 C电流密度下可逆容量为118.3 mA·h·g^(-1),相比复合前提升81%。Recycling cathodes for sodium-ion batteries from waste ternary cathodes in lithium-ion batteries is feasible in light of the shortage of lithium resources and abundant sodium resources.Herein,waste ternary cathodes in lithium-ion batteries are used to synthesize P2-NMNC cathodes for sodium-ion batteries.The rate performance of the NMNC was enhanced by optimizing the phase composition in the cathode.Specifically,the NMNC cathode can transform from P2 type to P2/P3 type through the increase of sodium content.By further synthesizing P2/P3 phase at lower temperature,the P2/P3-NMNC delivers 165 mA·h·g^(-1) after 50 cycles at 0.2 C,with a high-capacity retention of 91.9%,which is 43.5%higher than that of P2-NMNC.Even at the high current density of 2 C,P2/P3-NMNC delivers a high reversible capacity of 118.3 mA·h·g^(-1) at 2 C,which is 81%higher than that of P2-NMNC.

关 键 词：废旧锂离子电池 三元正极材料 钠离子电池 循环再生 

分 类 号：X7[环境科学与工程—环境工程]