Hierarchical hybrid architectures assembled from carbon coated Li3VO4 and in-situ generated N-doped graphene framework towards superior lithium storage

Abstract

Owing to high specific capacity (394 mA h g −1 based on a two-electron reaction), good ionic conductivity and suitable working potential (~ 0.8 V), Li 3 VO 4 (LVO) has been recently considered as a promising intercalation anode material for lithium-ion batteries (LIBs). Such material, however, suffers from poor electronic conductivity, thus limiting its practical applications. Herein, we develop a facile self-template strategy for constructing 3D hierarchical LVO/C hybrids assembled from carbon-coated LVO and in-situ generated N-doped graphene framework. Such hybrids not only offer an interconnected 3D conductive network, but also afford intimate contact between active components and conductive scaffolds, thus realizing a high-efficiency electron/ion transport system. When employed as anode for LIBs, the resulting product exhibits reversible capacities of 347.6 mA h g −1 at 0.5 A g −1 and 206.8 mA h g −1 at 4 A g −1 , and a capacity retention of 75.3 % after 1000 cycles at 1 A g −1 . This work provides a facile and green strategy for building 3D multiscale hierarchical hybrids, which could be extended to prepare other nanocomposites for energy-related applications. • Develop N-doped graphene framework encapsulated Li 3 VO 4 by a self-template strategy. • Such hybrids provide a 3D electron/ion conductive network. • Such hybrid can well accommodate the structural strain during cycles. • Realize superior high-rate capability and long-term cyclability.