Zinc-ion batteries (ZIBs) are promising alternative energy storage devices to lithium-ion batteries owing to the merits of large abundance, high theoretical capacity, and environmental friendliness. However, critical challenges including low working voltage (below 2 V), low energy density as well as dendrites formation during long cycling caused by aqueous ZIB systems still hinder their practical applications. Herein, a high-voltage Zn-graphite battery (ZGB) based on a non-zinc ion single-salt electrolyte (2.5 M LiPF₆ in carbonate solvent) is developed. Moreover, we surprisingly found that Zn²⁺ is dissolved in the LiPF₆ single-salt electrolyte during resting and discharging processes, thus enabling reversible Zn plating/stripping mechanism on the Zn foil anode in the ZGB over the voltage window of 1.0–3.1 V. As a result, the ZGB achieves long-term cycling performance with capacity retention of ∼100% for over 1200 cycles at 3 C and high Coulombic efficiency of ∼ 100% in 1.0–3.1 V with no dendrites formation. Moreover, the ZGB exhibits high working voltage of up to 2.2 V, thus contributing to both high energy density (up to 210 Wh kg⁻¹) and high power density (up to 1013 W kg⁻¹), superior than most reported ZIBs.

锌离子电池（ZIBs）由于其丰度高，理论容量高和环境友好等优点，有望成为锂离子电池的替代储能设备。但是，由水性ZIB系统引起的严峻挑战包括低工作电压（低于2 V），低能量密度以及长循环期间树枝状晶体的形成仍然阻碍了它们的实际应用。本文中，开发了基于非锌离子单盐电解质（在碳酸盐溶剂中为2.5 M LiPF ₆）的高压锌石墨电池（ZGB）。此外，我们意外地发现Zn ²⁺溶解在LiPF _6中在休息和放电过程中使用单盐电解质，从而在1.0–3.1 V的电压范围内，在ZGB中的Zn箔阳极上实现了可逆的Zn镀/剥离机制。因此，ZGB可以实现长期循环性能和容量在3 C的条件下，在1200个循环中可保持〜100％的电流，在1.0-3.1 V时可达到100％的高库仑效率，并且不会形成树枝状晶体。此外，ZGB表现出高达2.2 V的高工作电压，因此比大多数报告的ZIB具有更高的能量密度（高达210 Wh kg ^-1）和高功率密度（高达1013 W kg ^-1）。