锂金属电池三维集流体的改性研究

Research on modification of three-dimensional current collectors in lithium metal battery

采用电沉积的方法在三维铜集流体表面制备锡镀层,进一步在纯氩气氛中,分别对其进行300、400、500、600和700℃热处理,保温时间3 h。结果表明,热处理过程中表面镀层中的Sn原子逐步扩散到铜基体中,当热处理温度为600℃时,Sn元素均匀分布到铜基体中,此时,锂金属电池循环性能最佳,能够在高正极载量(17 mg/cm^(2))和低N/P比(0.6)的条件下,实现较大充放电倍率(0.5 C/3 C)下稳定循环130次。

Tin coating was prepared on the surface of a three-dimensional copper current collector using electrodeposition method.Furthermore,heat treatment was proceeded at 300,400,500,600 and 700℃for 3 hours in argon atmosphere.The results show that during the heat treatment process,Sn atoms on the surface gradually diffuse into the copper substrate.When the heat treatment temperature is 600℃,Sn elements are uniformly distributed into the copper substrate.On this condition,the cycling performance of lithium metal batteries is the best,which can achieve stable cycling for 130 cycles under high positive active materials loading(17 mg/cm^(2))and low N/P ratio(0.6),at a large charge/discharge rate(0.5 C/3 C).