Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 59, Issue 6, Pages 2273-2278Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201912203
Keywords
aqueous batteries; flexible electronics; oxygen vacancies; rechargeable batteries; vanadium oxide
Categories
Funding
- MOST [2016YFA0203302]
- NSFC [21634003, 51573027, 51673043, 21604012]
- STCSM [16JC1400702, 17QA1400400, 18QA1400700]
- SHMEC [2017-01-07-00-07-E00062]
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Rechargeable aqueous zinc-ion batteries are attractive because of their inherent safety, low cost, and high energy density. However, viable cathode materials (such as vanadium oxides) suffer from strong Coulombic ion-lattice interactions with divalent Zn2+, thereby limiting stability when cycled at a high charge/discharge depth with high capacity. A synthetic strategy is reported for an oxygen-deficient vanadium oxide cathode in which facilitated Zn2+ reaction kinetic enhance capacity and Zn2+ pathways for high reversibility. The benefits for the robust cathode are evident in its performance metrics; the aqueous Zn battery shows an unprecedented stability over 200 cycles with a high specific capacity of approximately 400 mAh g(-1), achieving 95 % utilization of its theoretical capacity, and a long cycle life up to 2 000 cycles at a high cathode utilization efficiency of 67 %. This work opens up a new avenue for synthesis of novel cathode materials with an oxygen-deficient structure for use in advanced batteries.
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