Synthesis of nanoparticle-assembled Zn3(VO4)2 porous networks via a facile coprecipitation method for high-rate and long-life lithium-ion storage

A simple coprecipitation route followed by a calcination process was developed to prepare 2D hierarchical Zn₃(VO₄)₂ porous networks formed by the crosslinkage of monolayered nanoparticles. As a promising anode for lithium ion batteries, the electrochemical performance of Zn₃(VO₄)₂ was investigated. At a current density of 1.0 A g^-1, the Zn₃(VO₄)₂ porous networks could register a high reversible discharge capacity of 773 mA h g^-1 and the capacity retention was 94% after 700 cycles. Moreover, a remarkable reversible discharge capacity of 445 mA h g^-1 was achieved at a current density of 5 A g^-1 after 1200 cycles. Even at a higher current density of 10.0 A g^-1, a high reversible capacity of 527 mA h g^-1 could be delivered, which still remained at 163 mA h g^-1 after 1200 cycles. This superior performance is attributed to the unique 2D porous networks with a stable structure. This work shows a new avenue for facile, cheap, green, and mass production of zinc vanadate oxides with 2D porous hierarchical networks for next-generation energy conversion and storage devices.

High Areal Capacity Li-Ion Storage of Binder-Free Metal Vanadate/Carbon Hybrid Anode by Ion-Exchange Reaction

Storing more energy in a limited device area is very challenging but crucial for the applications of flexible and wearable electronics. Metal vanadates have been regarded as a fascinating group of materials in many areas, especially in lithium-ion storage. However, there has not been a versatile strategy to synthesize flexible metal vanadate hybrid nanostructures as binder-free anodes for Li-ion batteries so far. A convenient and versatile synthesis of M_x V_y O_x+2.5y @carbon cloth (M = Mn, Co, Ni, Cu) composites is proposed here based on a two-step hydrothermal route. As-synthesized products demonstrate hierarchical proliferous structure, ranging from nanoparticles (0D), and nanobelts (1D) to a 3D interconnected network. The metal vanadate/carbon hybrid nanostructures exhibit excellent lithium storage capability, with a high areal specific capacity up to 5.9 mAh cm^-2 (which equals to 1676.8 mAh g^-1 ) at a current density of 200 mA g^-1 . Moreover, the nature of good flexibility, mixed valence states, and ultrahigh mass loading density (over 3.5 mg cm^-2 ) all guarantee their great potential in compact energy storage for future wearable devices and other related applications.

Uniform Co3V2O8 microspheres via controllable assembly for high-performance lithium-ion battery anodes

The magical formation process and excellent electrochemical performance.

Facile and controllable synthesis of solid Co3V2O8 micro-pencils as a highly efficient anode for Li-ion batteries

Mixed metal vanadate oxides are promising superior anode materials for lithium ion batteries due to their high specific capacities, improved cycling performance and excellent rate properties.