0 引 言
1 实验部分
1.1 多级孔石墨化碳(hierarchical porous carbon, HPC)的制备
1.2 硅负极的制备
1.3 硅负极的测试
2 结果与讨论
2.1 HPC的形貌和孔结构表征
Fig. 1 SEM (left) and TEM (right) image of HPC图1 HPC的SEM图(左)和TEM图(右) |
2.2 HPC-Si-PAN-450与Si-PAN-450的微观形貌表征
Fig. 2 TEM (a) and HRTEM (b) image of HPC-Si-PAN-450; TEM image of Si-PAN-450 (c)图2 HPC-Si-PAN-450的TEM(a)和HRTEM(b)图;Si-PAN-450的TEM图(c) |
2.3 PAN热处理前后的结构表征
Fig. 3 Raman spectra (a) and FTIR spectra (b) of PAN before and after annealing图3 聚丙烯腈碳化前(80℃)和碳化后(450℃)的拉曼光谱图对比(a)和傅里叶变换红外光谱图(b) |
2.4 硅负极的电化学性能表征
Fig. 4 Cycling performance of the silicon anodes at 0.5 A/g图4 三种硅负极在0.5 A/g下的循环性能 |
Fig. 5 Cycling performance of HPC-Si-PAN-450 at a current density of 1 A/g图5 HPC-Si-PAN-450在1 A/g电流密度下的循环性能 |