Aqueous rechargeable Zn metal batteries (AZMBs) have attracted widespread attention due to their intrinsic high volumetric capacity and low cost. However, the unstable Zn/electrolyte interface causes Zn dendrite growth and side reactions, resulting in poor Coulombic efficiency and unsatisfactory lifespan. Herein, a SiO 2 reinforced-sodium alginate (SA) hybrid film is designed to regulate solid-liquid interaction energy and spatial distribution of all species in the electric double layer (EDL) near the Zn electrode. The unique interfacial layer gives rise to a uniform distribution of Zn 2+ in the Helmholtz layer through solvation sheath modulation. Moreover, theoretical calculations show that the SO 4 2− anions and free-water are substantially reduced in the Helmholtz layer, effectively suppressing hydrogen evolution reaction and formation of by-products through strong charge repulsion and hydrogen bond fixing of free-water. The reconfigured EDL not only ensures homogenous and fast Zn 2+ transport kinetics for dendrite-free Zn deposition, but also eliminates interface parasitic side reactions. The Zn@SiO 2 -SA electrode enables excellent cycling stability of symmetrical cells and high-loading full AZMBs with a lifespan over 3000 h and an areal capacity of 2.05 mAh cm −2 , thus laying a solid basis for realizing practical AZMBs.
other areas, and play an important role in energy storage and conversion fields. [1][2][3][4][5][6][7] Nonetheless, the constantly expanding consumption market proposes higher demands for energy density and safety of LIBs, which encourages researchers to ulteriorly improve and optimize the existing LIBs system. The regulation of high-capacity electrode materials and wide operating voltage windows becomes the key to obtaining high energy density storage. In recent years, lithium metal anode has presented great application potential owing to the excellent theoretical specific capacity (3860 mA h g −1 ) and low electrode potential (−3.04 V vs standard hydrogen electrode (SHE)). The batteries assembled by lithium metal anode and high-capacity cathodes or high voltage cathodes achieve higher energy storage compared with traditional commercial LIBs. [8][9][10][11] However, lithium metal batteries (LMBs) have been suffering from liquid organic electrolyte safety issues. Generally, the volatile and flammable liquid organic electrolytes are easy to burn and burst when the batteries receive a violent impact or damage. [12][13][14] Uncontrolled lithium dendrites growth continuously consumes the electrolytes and increases the risk of short circuits. [15][16][17][18] Besides, liquid organic electrolytes are unstable in
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