Searching for stable cathodes is of paramount importance to the commercial development of low-cost and safe aqueous Zn-ion batteries (AZIBs). VO is a good candidate for AZIB cathodes but has unsatisfied cycling stability. Herein, we solve the stability issue of a VO cathode by coating a robust carbon shell. Strong evidence was provided that VO was oxidized to favorable VO·nHO during charging and the carbon shell could promote the oxidation of VO to VO·nHO. The discharge capacity was increased from ∼45 mA h g to 336 mA h g after VO was oxidized to VO·nHO, indicating a higher Zn-storage capability of VO·nHO than VO. In addition, the rate-capability and long-term cycling performance are greatly enhanced after coating carbon shells on the surface of VO nanorods. Therefore, the presented strategy of introducing carbon shells and fundamental insights into the favorable role of carbon shells in this study contribute to the advancement of highly stable AZIBs.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9479548 | PMC |
| http://dx.doi.org/10.3389/fchem.2022.956610 | DOI Listing |
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