Electrolyte containing phosphite lithium salt flame-retardant additive and lithium ion battery

The invention relates to an electrolyte containing a phosphite lithium salt flame-retardant additive. The electrolyte comprises 2%-20% of a lithium salt, 0.1%-10% of the phosphite lithium salt flame-retardant additive, 0.1%-10% of a film-forming additive and 70%-90% of a non-aqueous organic solvent. The lithium ion battery comprises a positive electrode, a negative electrode, a diaphragm and the electrolyte. The electrolyte disclosed by the invention has the characteristic of noninflammability and is relatively low in viscosity; the lithium ion battery using the electrolyte provided by the invention has relatively high specific discharge capacity, and thermal runaway does not occur in a thermal shock test. 本发明涉及一种含亚磷酸酯锂盐阻燃添加剂的电解液，包括2％-20％的锂盐、0.1％-10％的亚磷酸酯锂盐阻燃添加剂、0.1％-10％的成膜添加剂、以及70％-90％的非水有机溶剂。一种锂离子电池，包括正极、负极、隔膜和所述的电解液。本发明的电解液具有不燃的特性，且粘度较低；使用本发明电解液的锂离子电池具有较高的放电比容量，在进行热冲击试验时都未发生热失控。