Abstract
Square block-like σ-Mg0.25V2O5·H2O with an open layered framework has been successfully synthesized via a facile hydrothermal method. The entire synthetic process is efficient and economically beneficial. As a cathode material for lithium-ion batteries, the hydrated magnesium vanadium bronze exhibits a high reversible capacity and excellent cycling stability at high current rates. High discharge capacities of 294.2 and 221 mA h g−1 can be obtained at the current densities of 20 and 100 mA g−1, respectively. Meanwhile, the electrode achieves a capacity retention of 87.12% after 100 cycles at 100 mA g−1 and has an excellent long-term cyclic stability with an average decay of 0.053% per cycle over 400 cycles at 800 mA g−1. The structural stability and impedance variation of the σ-Mg0.25V2O5·H2O electrodes upon cycling have also been investigated. The excellent electrochemical performance suggests that the layered Mg0.25V2O5·H2O could be a promising candidate for the cathode material of lithium-ion batteries.
Original language | English |
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Pages (from-to) | 931-938 |
Number of pages | 8 |
Journal | Journal of Alloys and Compounds |
Volume | 777 |
DOIs | |
Publication status | Published - 10 Mar 2019 |
Externally published | Yes |
Keywords
- Cathode material
- Lithium-ion batteries
- Long-term cyclic stability
- Vanadium bronze
- σ-MgVO·HO