A Selenium-Modified Sandwich-like Stack of Vanadium-Carbon Nanobelts for High-Performance Aqueous Zinc-Ion Batteries with Superior Long-Term Stability and Rate Capability.
basic_science · Level V
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- Record sourced from PubMed, PMID 42080643.
- Also identified by DOI 10.1021/acs.nanolett.6c00110.
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Abstract
Vanadium-based compounds are promising cathode materials for aqueous zinc-ion batteries (ZIBs), while the relatively poor high-rate performance, unstable long-term stability, and slow migration of Zn<sup>2+</sup> ions have limited their practical applications. In this work, a sandwich-like stack of vanadium oxide-carbon nanobelts engineered with selenium defects (SL-V<sub>2</sub>O<sub>3</sub>/C-Se) was synthesized and used as a high-performance cathode for aqueous ZIBs. Taking advantage of the ordered and parallel arrangement of nanobelts with abundant selenium defects that facilitated the migration of the Zn<sup>2+</sup> ion and electrolyte, SL-V<sub>2</sub>O<sub>3</sub>/C-Se exhibited rate performance and long-term stability much better than those of commercial V<sub>2</sub>O<sub>3</sub> and V<sub>2</sub>O<sub>3</sub>/C without selenium doping. Even at a current density of 10 A g<sup>-1</sup>, SL-V<sub>2</sub>O<sub>3</sub>/C-Se exhibited a reversible capacity of 300 mAh g<sup>-1</sup>, which could retain 66% of its original capacity after 7000 cycles. This work provides an innovative approach to improve the capacity, long-term stability, and rate capability of electrode materials.