无机添加剂Na_2SO_3对石墨负极性能的改善

Improvement of Na_2SO_3-inorganic additive on performance of the graphite anode

在1mol/LLiPF6/EC+EMC电解液中添加少量的Na2SO3,通过与空白溶液比较显示添加Na2SO3能显著提高天然石墨负极充放电容量,降低首次循环过程中的不可逆容量损失,提高电极的循环性能和倍率充放电性能;电极表面SEI膜组分的FTIR分析和扫描电镜表明,添加一定量的Na2SO3在动力学方面有助于形成Li+迁移性良好的SEI膜。并且使用Na2SO3做添加剂,原料易得,成本低廉,对环境也几乎不造成污染。

Compared with the blank solution,adding a small amount of Na2SO3into 1 mol/L LiPF6/EC＋EMC electrolyte could significantly 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 performance.FTIR analysis and scanning electron microscopy indicate that adding a certain amount of Na2SO3 in the dynamics of Li＋ mobility contributes to the formation of a good SEI film.As the additive,Na2SO3 is the raw materials readily available,low cost and almost no environmental pollution.