Synergistic Effect of Core-Shell Heterogeneous V2O5@MV6O15 (M = Na, K) Nanoparticles for Enhanced Lithium Storage Performance

- V2O5@MV6O15 (M = Na, K) NPs are successfully constructed through a facile “semi-solid” synthetic method.
- The V2O5@MV6O15 NPs show much enhanced electrochemical performance as compared to V2O5.
- The enhanced performances are attributed to the synergistic effects from the outer MV6O15 layers.
- The synergistic effects are confirmed by the in-situ XRD testing results.

Synergistic effects of heterostructures can improve electrochemical properties of electrode materials. Herein, core-shell heterogeneous structures of V2O5@MV6O15 (M = Na, K) nanoparticles were designed and successfully synthesized through a facile “semi-solid” method. V2O5@NaV6O15 nanoparticles showed a high discharge capacity of 140 mAh g−1 at 200 mA g−1 which retained 94.9% after 200 cycles, higher than those of V2O5 nanoparticles (116.1 mAh g−1 and 58%). Moreover, through an advanced in-situ XRD technology, the synergistic effect of buffering and smoothing Li+ diffusion from MV6O15 outer layer was revealed. This facile strategy could be widely applied to improve the electrochemical performances of other electrode materials.

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