基于废弃涤纶面料的锂离子电池负极材料的制备及性能研究

Preparation and property of lithium-ion battery cathode material based on waste polyester fabric

利用热磺化工艺和热处理工艺将废弃的涤纶面料转变成硬碳并作为负极材料,制备了锂离子电池。通过热重分析仪、X射线衍射仪和扫描电子显微镜等分析手段证实了涤纶面料变成了非晶态硬碳材料。热磺化工艺将聚酯(PET)链上的部分H原子转化为磺酸基(SO_(3)H)基团,热处理工艺将大部分杂质去除以生成大孔隙的碳。采用恒流充放电法对组装的锂离子电池进行测试,在0.1A/g的电流密度下,电池首次比容量达到437mAh/g,循环50次后,比容量保持在220mAh/g左右。利用废弃涤纶面料制备的锂离子电池负极材料电化学性能良好且制作成本低,为废弃聚酯回收再利用提供了新的思路。

The waste polyester fabric was converted into hard carbon by thermosulfonation and heat treatment to prepare lithium-ion battery.Thermogravimetric analyzer,X-ray diffractometer and scanning electron microscope were used to confirm that the polyester fabric had become an amorphous hard carbon material.The thermosulfonation process converted some H atoms in the PET chain to SO_(3)H(sulfonic acid)groups,and the heat treatment process removed most of the impurities to form large pores of carbon.Constant current charging-discharge method was used to test the assembled lithium-ion battery.Under the current density of 0.1 A/g,its first specific capacity reached 437 mAh/g.After 50 cycles,the specific capacity remained about 220 mAh/g.The cathode material for lithium-ion battery prepared from waste polyester fabric had good electrochemical performance and low production cost,which provided a new idea for recycling waste polyester.