Synthesis And Modification Of Anode Material Titanium Niobium For Lithium Ion Batteries

Titanium niobium anode material,which is similar to lithium titanate anode,is an ideal embedded electrode material.Compared with lithium titanate anode,it has advantages of high charge discharge capacity and good safety,and it is a hot spot in the future development of lithium ion batteries.In this paper,we mainly study systhesis and modification of titanium niobium anode material for a new type of lithium ion battery cathode material with excellent electrochemical performance.In this experiment,the titanium niobium anode material was prepared by high temperature solid-state method,and the doping and coating method were also investigated.The optimum synthesis process conditions were TiO₂ as the titanium source,Nb₂O₅ as niobium source,the ratio amount of Ti and Nb was n?Ti?: n?Nb?=2.05,then 800? presintering for 6h,1200? calcined for 12h;With the optimum conditions of synthesis system has high crystallinity and purity by TiNb₂O₇ anode material have good rate capability,cycle performance and charge discharge capacity;For different amounts of vanadium doping TiNb2-xVxO7 sample morphology and the electrochemical performance analysis,we conclude that,best vanadium doping amount is 0.02,obtained when samples TiNb1.98V0.02O7 with optimal ion conductivity and electrochemical properties.Through respectively to different Nb₂O₅ and C coated synthetic composite materials TiNb₂O₇/Nb₂O₅/C electrochemical performance aspects of comparative analysis,we can conclude that Nb₂O₅ coated amount is 3%.C the coating amount is 10% is the best ratio of synthetic TiNb₂O₇/Nb₂O₅/C composite samples;optimum ratio under the condition of synthesis TiNb₂O₇/Nb₂O₅/C composite samples with the best electrochemical performance.