▎ 摘　　要

NOVELTY - An aqueous electrolyte solution comprises an additive (A1) comprising a zinc salt compound, and an additive (A2) including at least one amine salt compound chosen from compounds (I)-(III). USE - Aqueous electrolyte solution is used for flow-free zinc-bromine battery i.e. membrane-free zinc-bromine battery (all claimed). ADVANTAGE - The aqueous electrolyte solution is capable of improving electrochemical performance such as coulombic efficiency and lifetime of the battery. DETAILED DESCRIPTION - An aqueous electrolyte solution comprises an additive (A1) comprising a zinc salt compound, and an additive (A2) including at least one amine salt compound chosen from compounds of formulae (I)-(III). R,R =1-10C alkylene or 2-20C alkenylene; R -R ,R =H, halo, carboxy, -Ra'-COO-Rb', 1-20C alkyl, 2-20C alkenyl, 2-20C alkenyl, or 6-20C aryl, 5-20C heteroaryl, 5-20C cycloalkyl, 5-20C cycloalkenyl, or 7-30C arylalkyl (all optionally substituted); Ra'=1-3C alkylene; Rb'=H or 1-3C alkyl; R -R =H, hydroxy, halo, carboxy, 1-20C alkoxy, 1-20C aryloxy, 1-20C alkyl, 2-20C alkenyl, 2-20C alkynyl, or 6-20C aryl, 5-20C heteroaryl, 5-20C cycloalkenyl, 5-20C cycloalkyl, or 7-30C arylalkyl (all optionally substituted by hydroxy, halo, 1-5C alkyl, 6-20C aryl, carboxy, or -Ra'-COO-Rb'); A =halide, BF , ClO , BrO , AsF , PF , or SbF ; n=number of anionic groups (A ) such as 4-6; R -R =-Ra'-COO-Rb', H, hydroxy, halo, carboxy, 1-20C alkoxy, 1-20C aryloxy, 1-20C alkyl, 2-20C alkenyl, 2-20C alkynyl, or 6-20C aryl, 5-20C heteroaryl, 5-20C cycloalkenyl, 5-20C cycloalkyl, or 6-20C arylalkyl (all optionally substituted by hydroxy, halo, 1-5C alkyl, 6-20C aryl, carboxy, or -Ra'-COO-Rb'); R -R =-Ra'-COO-Rb', H, hydroxy, halo, carboxy, 1-20C alkoxy, 1-20C aryloxy, 1-20C alkyl, 2-20C alkenyl, 2-20C alkynyl, or 6-20C aryl, 5-20C heteroaryl, 5-20C cycloalkenyl, 5-20C cycloalkyl, or 6-20C arylalkyl;and R =H, halo, carboxy, -Ra'-COO-Rb', 1-20C alkyl, 2-20C alkenyl, 2-20C alkenyl, or 6-20C aryl, 5-20C heteroaryl, 5-20C cycloalkyl, 5-20C cycloalkenyl, or 7-30C arylalkyl (all optionally substituted by hydroxy, halo, 1-5C alkyl, 6-20C aryl, carboxy, or -Ra'-COO-Rb'). An INDEPENDENT CLAIM is included for a positive electrode current collector, which comprises the amine salt compound.