废旧锂离子电池基石墨烯/聚苯胺复合材料制备及其电化学性能研究

Preparation and Electrochemical Properties of Graphene/Polyaniline Composites from Spent Lithium-Ion Batteries

以废旧手机锂离子电池回收的负极石墨粉制备的氧化石墨烯(GO)和苯胺单体为原料,利用GO活化H_2O_2产生的·OH为氧化剂,采用原位复合法制备了不同质量比的石墨烯/聚苯胺复合材料,通过FTIR、XRD和SEM对其进行了表征,并利用循环伏安、交流阻抗、恒电流充放电等对其电化学性能进行测试。结果表明,该类石墨烯/聚苯胺复合材料具有良好的电化学性能,当电流密度为100mA/g时,质量比为1∶10制备的石墨烯/聚苯胺复合材料(rGO/PANI-10)的比电容达到481F/g,较石墨烯比容量(161F/g)提高了199%,较聚苯胺比容量(351F/g)提高了37%;在500mA/g电流密度下,rGO/PANI-10充放电循环1000圈后,电容保持率为77%,表现出较好的循环稳定性。

Using graphene oxide(GO),which was prepared from cathodic graphite powder of spent lithium-ion batteries by an improved oxidation-reduction method,and aniline monomer as starting materials,the graphene/polyaniline composites were prepared via in situ polymerization by hydroxyl free radicals(·OH)from GO activated H2O2.The structure of the composite was characterized by FT-IR,XRD and SEM.The electrochemical behavior of the composites electrode was evaluated by cyclicvoltammetry(CV),electrochemical impedance spectroscopy(EIS)and galvanostatic charge-discharge tests(GCD).The results showed that the capacitance of rGO/PANI-10 was 481 F/g at a current density of 100 m A/g,and it retained 77%capacitance after 1000 cycles at a current density of 500 m A/g.