Aqueous Zn-ion batteries have garnered significant attention as promising and safe energy storage systems. Due to the inevitable dendrite and corrosion in metallic Zn anodes, alternative anodes of intercalation-type materials are desirable, but they still suffer from low energy efficiency, unsatisfactory capacity, and insufficient cycle life. Here, we develop a high-performance anode for aqueous Zn-ion batteries via a lattice expansion strategy in combination with a Zn²⁺/H⁺ synergistic mechanism. The anatase TiO₂ with expanded lattice exhibits an appropriate deintercalation potential of 0.18 V vs Zn/Zn²⁺ and a high reversible capacity (227 mAh g^–1 at 2.04 A g^–1) with an outstanding rate capability and excellent cycle stability. The high electrochemical performance is attributed to a decrease in the Zn²⁺/H⁺ diffusion barriers, which results from lattice expansion and also a H⁺-promoted Zn²⁺ intercalation effect. The anode intercalates Zn²⁺/H⁺ via a solid-solution mechanism with a minor volume change, which contributes to the high reversibility and thus high energy efficiency. When paired with different types of cathodes, including NV, I₂, and activated carbon, to construct corresponding full cells, high specific energy, high specific power, long cycle life, and extremely high energy efficiency can be achieved. This study provides a prospect for developing high-performance Zn-ion batteries.

中文翻译：

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Lattice 将二氧化钛作为水性锌离子电池的优异阳极，通过高度可逆的 H+ 促进 Zn2+ 插层实现


水性锌离子电池作为有前途且安全的储能系统而受到广泛关注。由于金属 Zn 负极不可避免地会出现枝晶和腐蚀，因此需要替代插层型材料的阳极，但它们仍然存在能源效率低、容量不理想和循环寿命不足等问题。在这里，我们通过晶格膨胀策略结合 Zn²⁺/H⁺ 协同机制开发了一种用于水性 Zn 离子电池的高性能负极。具有膨胀晶格的锐钛矿 TiO₂ 表现出 0.18 V vs Zn/Zn²⁺ 的适当脱嵌电位和高可逆容量（2.04 A ^g-1 时为 227 mAh g^–1），具有出色的倍率能力和出色的循环稳定性。高电化学性能归因于 Zn²⁺/H⁺ 扩散势垒的减少，这是由于晶格膨胀以及 H⁺ 促进的 Zn²⁺ 插层效应造成的。阳极通过固溶机制嵌入 Zn²⁺/H⁺，体积变化很小，这有助于高可逆性，从而实现高能效。当与不同类型的阴极（包括 NV、I₂ 和活性炭）配对构建相应的全电池时，可以实现高比能量、高比功率、长循环寿命和极高的能源效率。本研究为开发高性能锂离子电池提供了前景。