Research On Saggar For Baking Anode Materials Of Lithium Ion Battery

Binary lithium battery anode materials are mainly prepared by solid-phase synthesis.The sagger is used as the burner material of the solid-phase synthesis method.It is not only a container for battery anode materials,but also a device that needs to be used repeatedly.The pros and cons directly affect the quality of battery anode materials and the economic benefits of the company.Therefore,they have attracted widespread attention from new materials and refractory research and production manufacturers;how to increase the production efficiency of lithium battery anode materials and improve the performance of the sagger life.To increase the service life of the sagger is an urgently needed issue for lithium battery anode material manufacturers and refractories researchers at home and abroad in recent years.Lithium battery anode material firing sagger needs to have the following properties:good mechanical properties,can meet the requirements of strength during transportation and loading during use;excellent thermal shock stability performance,can meet multiple cycles of use,reduce production costs need has excellent resistance to anode material erosion,and meets the requirements of non-polluting or less polluting anode materials.This project is aimed at the laboratory.By analyzing and comparing the differences in the composition and structure of the casserole sagger at home and abroad,starting from the combination of aggregates and optimization of the matrix,the relationship between the composition,structure and performance of the firing sagger is explored.Production and use provide experimental data support.In this paper,roasted mullite,cordierite,and magnesia-spinel are used as the main raw materials for aggregates.Guangxi white mud,kaolin,talc,silica powder,and?-alumina powder are used as matrix materials.Dextrin,aluminum sol,The mullite sol was used as a binding agent to study the phase composition,microstructure,mechanical properties,and resistance to anode material erosion of the box material,such as the type and size of the aggregate,the roasting temperature,the amount of Guangxi white mud added,and the type of the binding agent.The impact of performance,research results show:1.The ability of different types of raw materials to resist the erosion of lithium battery anode materials is:magnesium aluminate spinel>mullite>cordierite.2.The effect of aggregate type and particle size on the properties of the sample can be summarized as:the particle size and type of the aggregate are different,the room temperature physical properties,thermal properties and lithium-cobalt material erosion resistance are different,and cordierite(3-1 mm)And mullite(1-0 mm)are the best in aggregate performance.At this time,the apparent porosity of the sample is24.7%,the bulk density is 2.07g/cm~3,and the flexural strength at room temperature is10.1 MPa.The compressive strength at room temperature is 31.7 MPa.3.The erosion mechanism of the anode material of the lithium battery on the bowl can be summarized as follows:a)A new phase formed by the reaction between the anode material of the lithium battery and the material of the sample itself,the newly generated phase does not match the thermal expansion coefficient of the material Structural spalling occurs under conditions of drastic temperature changes,contaminating anode materials.b)Li and Co ions diffuse faster at high temperatures.Li and Co ions penetrate into the inside of the sample along the contact surface,and react with the refractory oxide to change the structure of the sample,and eventually cause the sample to be damaged.4.The effects of additives and temperature on the performance of the sample can be attributed to:different types and contents of additives,temperature differences lead to different internal pore structure and liquid phase generation of the material,resulting in different sample mechanical properties,thermal properties and corrosion resistance,When Guangxi white mud was added at 4%,silica was added at 4%,and the calcination temperature was 1330?,the comprehensive performance of the sample was the best.At this time,the apparent porosity of the sample was 22.3%,and the bulk density was 2.09 g/cm~3.The flexural strength at room temperature is 14.1 MPa,the compressive strength at room temperature is 45.2 MPa,and the strength retention rate after three thermal shocks at 1000°C is 78.8%.5.The sol binder can form a skeleton structure inside the sample,can participate in internal reactions,enhance the bonding performance,and reduce the erosion of the anode material through the pores.The comprehensive performance of the sample when6 wt%mullite sol is used as the binder The best,at this time,the bulk density of the sample is 2.34 g/cm~3,the apparent porosity is 14.7%,the flexural strength at room temperature is 21.1 MPa,the compressive strength at room temperature is 72 MPa,and the retention rate of flexural strength after thermal shock is 85.1%.