期刊
ACS APPLIED MATERIALS & INTERFACES
卷 13, 期 22, 页码 25993-26000出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c04279
关键词
aqueous batteries; cation conversion-intercalation; tri-ion intercalations; vanadium redox; zinc-ion batteries
资金
- US Department of Energy (DOE), Office of Science, Basic Energy Sciences [DE-SC0018922]
- U.S. Department of Energy (DOE) [DE-SC0018922] Funding Source: U.S. Department of Energy (DOE)
The reversible multi-ion storage mechanism in aqueous Zn-ion batteries using sodium vanadate cathode materials demonstrates high capacity and cycling stability, providing a design principle for developing high-capacity aqueous electrode materials.
Aqueous Zn-ion batteries (AZIBs) are promising alternatives to lithium-ion batteries in stationary storage. However, limited storage capacity and cyclic life impede their large-scale implementation. We report reversible electrochemical insertion of multi-ions into sodium vanadate (NaV3O8) cathode materials for AZIBs, achieving a maximum storage capacity of 450 mAh g(-1) at 0.05 A g(-1) and a capacity retention of 82% after 500 cycles at 0.4 A g(-1). In addition to Zn2+ and H+ insertion, in situ X-ray diffraction (XRD) and X-ray absorption spectroscopy (XAS) collectively provide explicit evidence on vanadyl ions (VO2+) conversion-intercalation at the NaV3O8 cathode, showing the deintercalation of VO2+ from NaV3O8 and the consequent conversion of VO2+ into V2O5 on charging, and vice versa on discharging. Our study is the first to report on the cation conversion-intercalation mechanism in AZIBs. This reversible multi-ion storage mechanism provides a design principle for developing high-capacity aqueous electrode materials by engaging both the intercalation and conversion of charge carriers.
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