有机溶剂浸泡法回收再利用锂离子电池钛酸锂负极材料

摘要

The waste lithium-ion batteries were recycled by an organic solvent immersion method. The structure, morphology and electrochemical performance of the recycled Li4Ti5O12(LTO) were characterized. The recycled LTO was then used as anode material for lithium-ion battery. XRD results revealed that the material, which was synthesized by adding appreciate amount of lithium source, was pure and possessed a spinel structure. SEM images exhibited that the final recycled powder has a uniform particle distribution without agglomeration. EIS results demonstrated that the electrode material obtained by sintering after removing the carbon away has smaller charge transfer resistance and higher lithium ion diffusion coefficient than the material without adding lithium resource. Moreover, at 0.1 C rate after 100 cycles, its capacity remained at 92.4%, exhibited better cyclic stability and reversibility, which can be reused as anode material for lithium-ion battery.%利用有机溶剂法回收了废旧锂离子电池中的钛酸锂负极材料，并对回收的钛酸锂材料的结构、形貌和电化学性能进行了测试。XRD 结果表明，材料除炭后添加适量锂源进一步合成得到的产物具有尖晶石结构，且不含其他的杂质。SEM 图像显示，其颗粒分布均匀、无团聚现象。EIS 结果表明，最终回收的钛酸锂电极材料比未添加锂源进行煅烧处理的材料具有较小的电荷转移阻抗和较高的锂离子扩散系数。在0.1 C倍率下，经过100次循环后其容量保持率为92.4%，具有优异的循环稳定性和可逆性，可以实现循环利用。