Synthesis And Investigation Of Anode Materials For Lithium Ion Batteries With Superior Electrode Performance

With the continuous development of society,lithium-ion batteries for its unique energy storage and charge and discharge advantage is gradually occupy the tide of social development.With existing various battery energy storage,such as zinc manganese battery,lead acid battery,solar cells,lithium ion battery has many advantages,such as:high voltage platform and good performance ratio,storage of great capacity,long cycle life,environment friendly and so on.At present,lithium ion battery has been widely used in mobile phones,computers,cars,and city buses,etc.At present,the market for mass production of lithium ion battery cathode material for lithium iron phosphate system and the ternary system,anode materials are still commonly used or carbon-based materials.Carbon anode materials in use process due to produce dendrite and there are some security issues.Compared with the carbon material,TiO2 materials for lithium ion battery anode materials have many unique advantages:in the process of charging and discharging volume change is not obvious,stable structure,good cycle stability and superior performance ratio,is the researchers' eyes "zero strain"material,have very extensive application value and development prospects.This article selects the biomass sodium alginate and phenolic resin as the template,through simple synthesis methods of preparation of a series of different structure of TiO2,shows good electrochemical performance.Specific work is as follows:(1)By the water-soluble biomass material sodium alginate as a template,through simple synthesis methods of mesoporous TiO2 nanomaterials composed of nanoparticles.Systematically studied the material ratio,reaction temperature conditions on the influence of the structure,morphology and electrochemical properties of the material.Results showed that the mesoporous structure plays an important role to improve the electrochemical performance of electrode materials.Through the electrochemical results show that the preparation of samples we only TiO2-700 showed the highest electrochemical performance.When the charging and discharging rate is 5 Cand 10 C,TiO2-700 material is still maintained a high reversible capacity 181.9 mAh g-1 and 162.4 mAh g-1.(2)By hydrothermal synthesis method,phenolic resin as the template for the synthesis of nanostructures TiO2 hollow ball,systematically studies the reaction conditions,such as reaction time,the morphology structure of the product.From the analysis results of the electrochemical,TiO2-4 materials have the most superior electrochemical performance,under 0.5 C to charge and discharge rate,the first discharge capacity in the process of charging and discharging is about 287.3 mAh g-1,charging capacity is about 227.8 mAh g-1,the coulomb efficiency is about 79.3%.When charging and discharging rate of 1 C and 5 C and 10 C respectively,the reversible capacity were 210.3 mAh g-1,165.5 mAh g-1,149.7 mAh g-1.Even under the high charge and discharge rate of 20 C,TiO2-4 material after 20 times of charging and discharging cycle can also have the high irreversible capacity of 130.2 mAh g-1.