Preparation And Modification Of Lithium Titanate

Spinel Li₄Ti₅O₁₂ has a series of advantages and has become a new anode material for lithium-ion batteries.Li₄Ti₅O₁₂ is prepared by different methods,and Li₄Ti₅O₁₂ is deeply studied in different aspects.Li₄Ti₅O₁₂ powder is synthesized by sol-gel method,using citric acid as a complexing agent,tetrabutyl titanate,lithium acetate and lithium carbonate as raw materials and holding at 700? to 900? for different times.Studies indicates that as the calcination temperature and holding time increase,the purity and specific surface area also gradually increase.When calcined at 900? for 8 h,pure phase Li₄Ti₅O₁₂ is obtained.In the charge and discharge performance test at 0.1 C,the first specific discharge capacity is 223 m Ah/g.After 50 cycles,the specific discharge capacity is 217 m Ah/g and the retention rate is 97.3%.Li₄Ti₅O₁₂ is synthesized by sol-gel method,using triethanolamine as a complexing agent,tetrabutyl titanate and lithium acetate as raw materials and holding at 600 to 900?for different time.Studies indicates that as the calcination temperature increases,the purity increases and the particle size gradually increases.When calcined at 900? for 8 h,pure phase Li₄Ti₅O₁₂ is obtained.The first specific discharge capacity at 0.1 C is 177 m Ah/g.After 50 cycles,the battery retention rate is 84%.Aiming at the problem of serious capacity degradation at high magnification of Li₄Ti₅O₁₂,the morphology modification of Li₄Ti₅O₁₂ is performed by electrospinning method,and the influence of calcination temperature on the structure and electrochemical performance of Li₄Ti₅O₁₂ is investigated.With the increase of calcination temperature,the fiber diameter of Li₄Ti₅O₁₂ gradually decreases,and the Li₄Ti₅O₁₂ samples is prepared at 800? and 900? became a chain fiber structure.Among them,Li₄Ti₅O₁₂ material prepared at 900? has the best performance.The first discharge specific capacity at 0.1C is 207 m Ah/g.After 50 cycles,the discharge capacity still reached 179 m Ah/g,and the cycle performance is excellent.Figure 44;Table 5;Reference 96...