Synergistic Effect of Core-Shell Heterogeneous V2O5@MV6O15 (M = Na, K) Nanoparticles for Enhanced Lithium Storage Performance. (10th November 2017)

• Record Type: Journal Article
• Authors: Huang, Meng; Zhang, Caiyi; Han, Chunhua; Xu, Xiaoming; Liu, Xiong; Han, Kang; Li, Qi; Mai, Liqiang
• Is Part Of: Electrochimica acta. Volume 254(2017)
• Page Start: 262
• Page End: 268
• Publication Date: 2017-11-10
• Subjects: in-situ XRD -- synergistic effect -- core-shell -- heterogeneous structures -- lithium storage; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2017.09.077
• Languages: English
• ISSNs: 0013-4686

Abstract

Graphical abstract: Highlights: V2 O5 @MV6 O15 (M = Na, K) NPs are successfully constructed through a facile "semi-solid" synthetic method. The V2 O5 @MV6 O15 NPs show much enhanced electrochemical performance as compared to V2 O5 . The enhanced performances are attributed to the synergistic effects from the outer MV6 O15 layers. The synergistic effects are confirmed by the in-situ XRD testing results. Abstract: Synergistic effects of heterostructures can improve electrochemical properties of electrode materials. Herein, core-shell heterogeneous structures of V2 O5 @MV6 O15 (M = Na, K) nanoparticles were designed and successfully synthesized through a facile "semi-solid" method. V2 O5 @NaV6 O15 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 V2 O5 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 MV6 O15 outer layer was revealed. This facile strategy could be widely applied to improve the electrochemical performances of other electrode materials.