Aqueous zinc batteries are the frontiers in electrochemical energy–storing devices due to their environmental friendlies, excellent safety, and low-cost nature. However, dendrite growth, gas generation and, limited cycling life are the bottlenecks for aqueous zinc batteries’ practical use. Here, we engineered a water-in-bisalt electrolyte with a hydrogen-bond rich additive 1,2- dimethoxy ethane (DME), which synergistically reduces free water activity and improves the electrochemical performance of aqueous lithium – zinc hybrid batteries. As a result, the Zn||Cu half-cell exhibits 99.43% average coulombic efficiency (ACE) at 0.5 mA cm⁻² after 200 cycles using DME additive. Molecular Dynamics (MD) simulation, FTIR, Raman, and NMR confirm the significant decrease of water activity via the synergetic effect of water-in-bisalt electrolyte and the hydrogen-bond rich additive (DME). Interestingly, the synergetic effect improves zinc nucleation and growth on the surface of the anode and forms homogeneous, dense and smooth zinc deposition. In contrast, the ACE of the non-DME-containing electrolyte is 99.25%., at the same condition, The Zn||LFP full cell with the DME additive gives a CE higher than 99.3% and the capacity retention of 99.49% after 100 cycles at 91 mAg⁻¹ compared to almost no capacity in the absence of DME after 35 cycles.

水系锌电池由于其环保、安全和低成本的特性而成为电化学储能装置的前沿。然而，枝晶生长、气体产生和有限的循环寿命是水性锌电池实际应用的瓶颈。在这里，我们设计了一种双盐包水电解质，其中含有富含氢键的添加剂 1,2-二甲氧基乙烷 (DME)，可协同降低游离水活度并提高水性锂-锌混合电池的电化学性能。因此，Zn||Cu 半电池在 0.5 mA cm ^{-2 下}表现出 99.43% 的平均库仑效率 (ACE)使用 DME 添加剂循环 200 次后。分子动力学 (MD) 模拟、FTIR、拉曼和 NMR 证实了通过双盐包水电解质和富氢键添加剂 (DME) 的协同效应显着降低了水活度。有趣的是，协同效应改善了阳极表面锌的成核和生长，并形成均匀、致密和光滑的锌沉积。相比之下，不含 DME 的电解液的 ACE 为 99.25%，在相同条件下，添加 DME 添加剂的 Zn||LFP 全电池的 CE 高于 99.3%，100 年后容量保持率为 99.49%。在 91 mAg ^{-1 下}循环，而在 35 次循环后没有 DME 的情况下几乎没有容量。