A lithium metal negative electrode film forming electrolyte for lithium sulfur battery and additive thereof

The invention discloses a lithium metal negative electrode film forming electrolyte for lithium sulfur battery and additive thereof, the structure of the additive is in the description,wherein at least one of R1, R2, R3, R4 and R5 is -F, -Cl, -Br, -I or -NO3, remaining beingH; At least one of R6, R7, R8, R9, or R10 is-F,-Cl,-Br,-I or-NO3, remaining beingH; The quantity x of S is 1 to 6; The weightof the additive of the electrolyte of the present invention is 0.01 to 5% of the total weight of the electrolyte. The invention can effectively inhibit the growth of lithium dendrite, improve the charge-discharge efficiency and capacity retention rate of the corresponding lithium sulfur battery, and prolong the cycle life of the battery. 本发明公开了种用于锂硫电池的锂金属负极成膜电解液及其添加剂，所述添加剂的所述添加剂的结构如下：其中，R、R、R、R和R中至少有个为-F、-Cl、-Br、-I或-NO，其余为-H；R、R、R、R或R中至少有个为-F、-Cl、-Br、-I或-NO,其余为-H；S的数量x的数值为1～6；本发明的电解液的添加剂的重量为电解液总重量的0.01～5％。本发明可以有效抑制锂枝晶的生长，提升相应锂硫电池的充放电效率和容量保持率，延长电池循环寿命。