Ag掺杂方法对锂氟化碳电池性能的影响

Effect of Ag doping method on performance of lithium fluorocarbon batteries

通过物理球磨法和化学还原法制备了Ag掺杂的CFx复合材料,分别以CFx材料、制备的复合材料为活性物质,装配成2 Ah的锂氟化碳软包电池,探讨了Ag掺杂方法对电池电化学性能的影响。采用XRD、SEM、EDS对制备的正极片的物相结构、形貌进行测试,用恒电流放电对电池的倍率性能进行测试。结果表明,化学还原法制备的CFx/Ag-2材料电导率最高,以CFx/Ag-2复合材料为活性物质制备的电池电化学性能最好。与CFx电池相比,0.1 C放电,CFx/Ag-2电池无电压滞后现象,0.5 C、1 C倍率放电,CFx/Ag-2电池低波电压分别提高0.83、0.92 V;0.1 C、0.5 C、1 C倍率放电,CFx/Ag-2电池平台电压分别提高0.258、0.302、0.236 V;1 C倍率放电,软包电池表面最高温度39℃。

Ag doped CF_x composites were prepared by physical milling and chemical reduction.2 Ah Li/CF_x soft battery was assembled with CF_x material and composite material as active materials.The effect of Ag doping method on the electrochemical performance of the battery was discussed.XRD,SEM and EDS were used to test the phase structure and morphology of the prepared cathode.Constant current discharge was used to test the rate performance of the battery.The results show that the conductivity of CF_x/Ag-2 prepared by chemical reduction method is the highest.The battery that was prepared with CF_x/Ag-2 composite as the active material has the best electrochemical performance.Compared with CF_x battery,CF_x/Ag-2 battery has no voltage lag phenomenon when discharged at 0.1 C.When discharged at 0.5 C and 1 C,the low wave voltage of CF_x/Ag-2 battery increases by 0.83 and 0.92 V respectively.When discharged at 0.1 C,0.5 C and 1 C,the platform voltage of CF_x/Ag-2 battery increases by 0.258,0.302 and 0.236 V respectively.When discharged at 1 C,the maximum surface temperature of soft battery is 39℃.