Study On Synthesis Of Lithium Titanate Materials By Explosion Method

With the development of society and the advancement of science and technology,the development of new energy has gradually become the new normal.Lithium titanate(Li₄Ti₅O₁₂)ion battery as a new type of chemical energy,its research and development has been the worldwide attention.Li₄Ti₅O₁₂ is a spinel structure crystal.As a kind of"zero strain"electrode material,Li₄Ti₅O₁₂ has an extremely high and flat working potential.With high safety,long cycle stability,high coulomb efficiency,simple preparation and low price,widely used in portable electronic products,industrial energy storage equipment and electric vehicles and other related fields.Explosion synthesis technology has unique advantages in synthesizing new materials due to its rapid reaction,high temperature and high pressure.It is great of significance for the synthesis and preparation of Li₄Ti₅O₁₂ materials.In this paper,a special emulsion explosive was used as a precursor to carry out explosive synthesis of Li₄Ti₅O₁₂ material.It was including the formulation design of emulsion explosives containing different mass fractions of lithium nitrate?LiNO₃?,the calculation of detonation parameters,performance measurement,the explosion synthesis of Li₄Ti₅O₁₂ powder and characterization of the explosion product.The specific research work and related conclusions are as follows:?1?By selecting the explosive carrier,it is determined that the emulsion explosive is used as an explosive carrier for explosive synthesis.By means of explosion synthesis of Li₄Ti₅O₁₂ materials,the preparation method of solid precursors and sol-gel based precursors were determined.The control conditions of the source materials and preparation processes required for the preparation of the two precursors were also introduced.?2?Through the analysis of the design principle of special emulsion explosive formulation,a mathematical model was established.According to the experimental situation and appropriate constraints,four special emulsion explosive formulations with LiNO₃ mass fractions of 10%,15%,20%and 30%were obtained.According to the preparation experience of the emulsion explosive,it was determined that the emulsion explosive was prepared by the water phase temperature of 105°C,the oil phase temperature of 95°C,the emulsification stirring rate of about 1500 r·min^–1 and physical sensitization.?3?The detonation parameters of special emulsion explosives with different LiNO₃ mass fractions were calculated and determined by theoretical calculation and experimental test.The results show that the explosive heat of 10%,15%,20%and 30%of the mass fraction of LiNO₃ are 3395.24,3391.03,3386.30 and 3374.76 kJ·kg^–1,respectively.The explosion temperatures are 2209,2228,2261 and 2320 ^oC,respectively.With the increase of LiNO₃ content,the explosion heat and detonation velocity showed a downward trend,while the explosion temperature showed an opposite trend gradually increasing.?4?Firstly,the special emulsion explosive designed by mathematical model was used as explosive carrier to synthesize Li₄Ti₅O₁₂ material.Secondly,the precursor prepared by two different methods was mixed with common emulsion explosive to synthesize Li₄Ti₅O₁₂ material.The effects of two kinds of emulsion explosives on the particles and morphological powder of explosion synthesized Li₄Ti₅O₁₂ material were studied.The results showed that LiNO₃ was one of the basic components of emulsion explosives and the higher the content of LiNO₃,the more regular and uniform the Li₄Ti₅O₁₂ particles synthesized by the corresponding emulsion explosives.The better the uniformity and particle morphology of the Li₄Ti₅O₁₂ by the explosion synthesized of precursors and common emulsion explosives.In addition,the Li₄Ti₅O₁₂ particles and morphology prepared by the sol-gel method are more uniform than those prepared by solid phase method,and the morphology and distribution of Li₄Ti₅O₁₂ particles are uniform.Figure[33]table[9]reference[120]...