Pseudocapacitance controlled fast-charging and long-life lithium ion battery achieved via a 3D mutually embedded VPO4/rGO electrode

In order to develop fast charging and long cycling anode material for high energy lithium ion batteries, three-dimensional materials have been ideal candidates for constructing the abundant ion transport channels, and providing fast electrochemical reaction kinetic. Here, a three-dimensional hydrangea-like, pseudocapacitive Vanadium phosphate (VPO4)/reduced graphene oxide (rGO) microspheres are prepared by in-situ solvothermal reduction method to form self-supporting porous anodes for lithium-ion batteries. Porous microspheres are embedded in an interlaced mesoporous rGO conductive network that increase surface redox capacitive lithium storage obviously. Through differentiating the contribution from pseudocapacitance and diffusion-controlled process, the charge-discharge mechanism is dominated by the pseudocapacitance. Thereby the as prepared electrode delivers an excellent fast-charging and long-life performance (537 mAh g(-1) at 0.1 A g(-1), 318 mAh g(-1) even after 3000 cycles at 2 A g(-1), the weight is based on whole electrode). (C) 2019 Elsevier B.V. All rights reserved.