Novel additive with high and low temperature performance as well as preparation method and application of novel additive

The invention discloses a novel additive with high and low temperature performance, a preparation method of the novel additive and application of the novel additive as a lithium ion battery electrolyte additive, the structure of the novel additive is selected from at least one of the following formulas (I) and (II): Ma [P2 (SO4) xF12-2x] (I) and Ma [B2 (SO4) yF8-2y] (II), when a is 1, M is Mg; when a is 2, M is independently selected from Li, Na and K; 1 < = x < = 3, 1 < = y < = 2, and x and y are integers. The novel additive can improve the high and low temperature performance of the battery, has long cycle life, and is especially suitable for high-voltage or high-nickel system batteries. 本发明公开了一种兼具高低温性能的新型添加剂、其制备方法及其作为锂离子电池电解液添加剂的应用，所述新型添加剂的结构选自下式(I)、(II)中的至少一种：Ma[P2(SO4)xF12-2x](I)，Ma[B2(SO4)yF8-2y](II)，其中，a为1时，M为Mg；a为2时，M独立地选自Li、Na、K；且1≤x≤3，1≤y≤2，x和y为整数。本发明的新型添加剂能提高电池高低温性能、长循环寿命，尤其适用于高电压或高镍体系电池等优点。