ИСТИНА

The search of high-performance anode materials for lithium-ion batteries is currently one of the most important tasks. Battery performance is not only depending on the materials properties of anode and electrodes but also on the interface or surface effects. The development of suitable electrode materials with superior interface or surface properties along with stability and low cost are highly demanded. So, to keep up with recent rapid advancement in cathode materials it is desperately needed to seek for suitable and innovative high-performance anode materials. Previous research has shown that BiVO4 is a promising electrode, in particular, anode material for lithium-ion batteries; it shows an excellent reversible capacity of 769 mAh/g at 0.12 A/g with a great capacity retention. The motivation to use this material in this study is its unique layered crystal structure. Varying the conditions of the synthesis makes it possible to easily manage the morphology of the material that can be used to fine tune lithium-ion batteries. The use of graphene can improve material stability and conductivity. That is, the significance of conducting additives in device fabrication will be smaller and therefore the anode of the same size will have more electrode material. This means that capacity of the cell could be increased without changing size, shape and structure of the battery. Also graphene addition can make anode material more durable, because graphene is the strongest material ever produced, it is able to prevent a crystal structure from cracking during cycling. Graphene modified BiVO4 were synthesized by hydrothermal method at a temperature 180 C using bismuth nitrate, ammonium metavanadate, graphene oxide and hydrazine chloride as a reducing agent. Electrochemical properties of initial and graphene modified materials were examined.