不同铵盐添加剂在同一电解液体系中对天然石墨性能的影响

Affect on the Performance of Natural Graphite by Different Ammonium Salt Additives in the Same Electrolytic System

应用循环伏安和恒电流充放电等电化学方法结合微观测试手段傅里叶变换红外光谱(FTIR)和扫描电镜(SEM)分析了电解液中加入少量不同铵盐后对石墨电极电化学性能的影响。通过与空白溶液比较显示,添加(NH4)_2SO_4能提高天然石墨负极首次循环过程中的充放电容量,降低不可逆容量损失,提高电极的循环性能和倍率充放电性能,扫描电镜和FTIR分析表明,添加适宜浓度的(NH4)_2SO_4有助于改善天然石墨的电化学性能。

The electrochemical behavior of different ammonium salt additives affected the performance of natural graphite in the same electrolytic system,and SEM and FTIR were used for analysis of the electrode SEI film after cycling.Compared with the blank solution,adding a small amount of（ NH_4）_2SO_4 into 1 mol/LLiClO_4/EC ＋ DMC electrolyte could increase the natural graphite anode charge- discharge capacity,lower the irreversible capacity loss during the first cycle,and increase the electrode cycling performance and the charge and discharge capacity performance. FTIR and SEM indicated that adding the appropriate concentration of LiClO_4 helped to improve the electrochemical performance of natural.