添加剂二甲基乙酰胺与石墨负极的相容性

Compatibility between graphite anode and dimethylacetamide as additive

研究N,N-二甲基乙酰胺（DMAC）用作电解液添加剂对石墨电极电化学性能的影响。体积比为2.5%的DMAC加入1 mol/L LiPF_6/EC＋PC（1∶1,体积比）中,可改善人造石墨电极的电化学性能,以0.05 C在2.00~0.01 V充放电,首次循环的库仑效率提高到92.2%,第50次循环的放电比容量仍有约340 mAh/g,且EC与PC的体积比达到2∶8时,仍有很好的效果。表明DMAC在用作电解液添加剂时,能很好地与石墨负极相容。

N, N-dimethylacetamide （ DMAC ） was adopted as electrolyte additive, the electrochemical performance of graphite electrodes was studied. As DMAC was adopted as electrolyte additive with 2. 5% （volume）inl mol/L LiPF6/EC ＋ PC （1： 1, V： V）, the artificial graphite electrode exhibited significantly, it＇ s electrochemical performance was enhanced in terms of the Coulombic efficiency in initial cycle（92. 2% ）and good cycle performance with specific discharge capacity about 340 mAh/g at the 50th cycle. Even when the volume ratio of EC and PC was 2： 8, the artificial graphite electrode still it＇ s showed electrochemical performance was improved. All these could be ascribed to the good compatibility between DMAC as additive and graphite anode.