Redox of chlorine with high potential and specific capacity has attracted wide attention for energy storage applications, while it suffers from an undesired disproportionation reaction in aqueous electrolytes which hinders its development. Herein we propose a strategy via a unique solubilization effect of metal-halide complex ions to construct a high concentration of chloride (over 30 m) electrolyte with low cost to stabilize the oxidation products and suppress the side reactions, thus representing a high reversibility of the Cl₃^–/Cl^– redox couple up to 96.0% with 1.0 V vs SCE. The as-fabricated Zn–Cl₃^– full cell based on the highly concentrated electrolyte exhibits an ultrahigh operating voltage of 2.02 V at 1.0 mA cm^–2 in the nearly neutral system. In particular, an enhanced conversion efficiency at room temperature with durable cycling stability of 4000 cycles is demonstrated. These results open a new way for the development and application of aqueous chlorine-ion batteries.

中文翻译：

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浓缩氯基电解质可实现可逆 Cl3–/Cl– 氧化还原，适用于能量密集且耐用的水系电池

氯的氧化还原具有高电势和比容量，在储能应用中引起了广泛关注，但它在水性电解质中会发生不期望的歧化反应，这阻碍了其发展。在此，我们提出了一种策略，通过金属卤化物络离子的独特增溶作用，以低成本构建高浓度氯化物（超过30 m）电解质来稳定氧化产物并抑制副反应，从而表现出高可逆性相对于 SCE，1.0 V 时Cl ₃ ^– /Cl ^–氧化还原耦合高达 96.0%。基于高浓度电解质的所制造的Zn-Cl ₃^全电池在近中性系统中在1.0 mA cm ^{–2下表现出2.02 V的超高工作电压。}特别是，证明了室温下转换效率的提高以及 4000 次循环的持久循环稳定性。这些成果为水系氯离子电池的开发和应用开辟了新途径。