论文部分内容阅读
研究了具有不饱和双键和亚硫酸酯双官能团的乙烯基亚硫酸乙烯酯(VES)作为锂离子电池电解液成膜添加剂对中间相碳微球(CMS)和LiFePO_4电极电化学性能的影响.结果表明:在1 mol/L LiClO_4/PC电解液体系中,少量的VES(5%)能够在电化学过程中先于PC在CMS表面还原,形成稳定的SEI膜,明显抑制PC和溶剂化锂离子共嵌入石墨层间,改善了电池的循环性能.此外,电解液1 mol/L LiClO_4/PC+5%VES(V:V)在LiFePO_4电极中展现出良好的电化学稳定性.“,”A film-forming additive, vinyl ethylene sulfite (VES) with both vinylene group and sulfite group, affects the electrochemical performance of carbonaceous mesophase spherules (CMS) and LiFePO_4 electrode. The results indicated that a small amount of VES (5%) could be reduced prior to the propylene carbonate (PC) solvent on the surface of CMS electrode in PC-based electrolyte to form a stable solid electrolyte interphase (SEI) layer, so co-intercalation of PC and solvated lithium ions to graphite could be suppressed. Furthermore, the electrolyte of 1 mol/L LiClO_4/PC+5%VES (V: V) exhibited excellent electrochemical stability in the LiFePO_4 electrode.