Abstract
Rechargeable aqueous zinc-ion batteries are a promising candidate for next-generation energy storage devices. However, their practical application is limited by the severe safety issue caused by uncontrollable dendrite growth on zinc anodes. Here we develop faceted titanium dioxide with relatively low zinc affinity, which can restrict dendrite formation and homogenize zinc deposition when served as the protective layer on zinc anodes. The as-prepared zinc anodes can be stripped and plated steadily for more than 460 h with low voltage hysteresis and flat voltage plateau in symmetric cells. This work reveals the key role of crystal orientation in zinc affinity and its internal mechanism is suitable for various crystal materials applied in the surface modification of other metal anodes such as lithium and sodium.
Highlights
Rechargeable aqueous zinc-ion batteries are a promising candidate for next-generation energy storage devices
Taking titanium dioxide (TiO2) for example, it can be used both for modification of current collectors and protection of metal anodes according to previous reports[15,16,17]
These results seem contradictory because good metal affinity is required when TiO2 is used as a decoration on current collectors to homogenize metal deposition while low metal affinity is necessary if it is served as a protective layer[18,19]
Summary
Rechargeable aqueous zinc-ion batteries are a promising candidate for next-generation energy storage devices. We develop faceted titanium dioxide with relatively low zinc affinity, which can restrict dendrite formation and homogenize zinc deposition when served as the protective layer on zinc anodes. 1234567890():,; Achieving higher energy density is the main development tendency for the next-generation battery system[1] Metal anodes, such as lithium (Li), sodium (Na), and zinc (Zn), with high theoretical capacity and low electrochemical potential are considered as the most promising materials to meet this requirement[2,3]. Taking titanium dioxide (TiO2) for example, it can be used both for modification of current collectors and protection of metal anodes according to previous reports[15,16,17] These results seem contradictory because good metal affinity is required when TiO2 is used as a decoration on current collectors to homogenize metal deposition while low metal affinity is necessary if it is served as a protective layer[18,19]. The modified Zn anode exhibits long-term cycle life during Zn stripping and plating
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