Vertical kiln lining for roasting positive electrode material of lithium battery and preparation method of vertical kiln lining

Abstract

The invention relates to a vertical kiln lining for roasting a positive electrode material of a lithium battery and a preparation method of the vertical kiln lining. According to the technical scheme, the preparation method comprises the following steps of uniformly mixing 52.0 to 67.0 weight percent of cordierite, 28.0 to 43.0 weight percent of mullite, 0.5 to 4.5 weight percent of kaliophilite, 0.3 to 3.3 weight percent of cerium oxide and 0.2 to 4.0 weight percent of binding agent to obtain a mixture, and molding the mixture, and preserving heat for 3-6 hours at the temperature of 150-180 DEG C to prepare the vertical kiln lining for roasting the positive electrode material of the lithium battery. The binding agent is one of zirconium phosphate, magnesium phosphate and aluminum dihydrogen phosphate; and the forming mode is one of pressure, pouring, ramming and smearing. The method has the characteristics of simple process and low production cost; the prepared vertical kiln lining for roasting the positive electrode material of the lithium battery is good in corrosion resistance, relatively good in stripping resistance, long in service life, capable of remarkably reducing pollution of the roasted positive electrode material of the lithium battery, good in roasting effect and particularly better in roasting effect when being used for a blocky blank of the positive electrode material of the lithium battery.

Description

technical field [0001] The invention belongs to the technical field of furnace linings for roasting positive electrode materials of lithium batteries. In particular, the invention relates to a shaft kiln lining for roasting positive electrode materials of lithium batteries and a preparation method thereof. Background technique [0002] The safety and performance of electronic equipment and electric vehicles are closely related to the capacity and efficiency of batteries. Therefore, the development of high-performance lithium battery materials with high stability and high energy density has become a hot research project in recent years. The positive electrode material of a lithium battery is composed of Li, Co, Mn and Ni, etc. The preparation process is usually to pack the raw materials in a sagger and fire them at 400-1000°C. During this process, the Li and Co compounds melt and infiltrate into the pores of the sagger, and react with the constituent components to induce cra...

AI Technical Summary

Problems solved by technology

However, it is difficult to mass-produce due to the complexity of the coating on the surface of the sagger, or there is a disadvantage of peeling due to the difference in thermal expansion coefficient between the coating and the material of the sagger

In addition, the treatment of the surface of the sagger can only reduce the degree of reaction between the sagger body and the battery material to be baked. In essence, it cannot prevent it from reacting with the positive electrode active material of the lithium battery, and then remains in the sagger. Roasting the battery powder, resulting in a decrease in the battery pass rate

Moreover, the sagger is used to hold the positive electrode material of the lithium battery, and the production efficiency is also low when combined with the discontinuous firing of the roller kiln, and the output of the positive electrode material of the lithium battery cannot meet the needs of the rapid development of the energy industry.

[0004] Generally speaking, the corrosion resistance of the sagger cannot be effectively guaranteed, and it is also easy to peel off into the baked battery powder, resulting in deterioration of battery performance. The overall service life of the sagger is short, and it is difficult to carry out subsequent recycling , unable to achieve a substantial increase in battery powder output

However, some shaft kiln lining technologies are mostly used for roasting refractory materials, and there are no public reports on shaft kiln linings for roasting lithium battery cathode materials.

Images