Sagger taking alumina sol as binding agent and used for sintering lithium battery cathode material and preparation method of sagger

Abstract

The invention relates to a sagger taking alumina sol as a binding agent and used for sintering a lithium battery cathode material and a preparation method of the sagger. The preparation method is characterized by comprising the following steps: firstly mixing 35-45 wt% of mullite, 20-25 wt% of cordierite, 20-25 wt% of magnesium aluminum spinel, 3-7 wt% of alumina sol, 4-7 wt% of Guangxi white clayand 2-7 wt% of silicon powder, and stirring for 8-10 min to obtain a mixture; and then mechanically pressing and shaping the mixture under a condition of 100-120 MPa, drying the mixture for 20-25 h under a condition of 90-110 DEG C, and then keeping the temperature of the mixture for 3-4 h under a condition of 1300-1400 DEG C to prepare the sagger taking the alumina sol as the binding agent and used for sintering the lithium battery cathode material. The preparation method involved in the invention has the characteristics of low production cost, simple process and high yield; and the preparedsagger taking the alumina sol as the binding agent and used for sintering the lithium battery cathode material is large in volume density, high in compressive strength, excellent in thermal shock resistance and good in erosion resistance.

Description

technical field [0001] The invention belongs to the technical field of saggers for sintering positive electrode materials of lithium batteries. In particular, it relates to a sagger for sintering positive electrode materials of lithium batteries with aluminum sol as a binder and a preparation method thereof. Background technique [0002] The current shortage of resources has led to the development of new energy sources. As one of the batteries with the highest energy density at present, lithium-ion batteries (also known as lithium batteries) have attracted widespread attention. The raw materials of lithium batteries mainly include positive and negative electrode materials, electrolytes , isolation film and packaging materials, etc. The cathode material is the most critical part of the lithium battery, which determines the safety performance of the battery and whether the battery can be produced on a large scale. It is also the material with the highest cost of lithium batte...

AI Technical Summary

Problems solved by technology

The existing sintered saggers, which are the positive electrode materials of lithium batteries, are moved forward by the friction force of the rollers in the roller kiln. The friction force of different rollers will cause the distances of the saggers to move forward to be different, which is easy to cause the saggers to be squeezed. Creates mechanical stress that creates cracks, leading to failure of the sagger

[0004] "A preparation process of corrosion-resistant sagger for calcined lithium battery positive electrode material" (CN105084921A) patent technology, using magnesium hydroxide, silicon dioxide, α-alumina and magnesium-rich spinel as raw materials, high-temperature firing to produce lithium ions Although the sagger used for sintering battery positive electrode materials has low volume density and thermal conductivity, the strength of the material is too low due to the large number of pores formed in the material

[0005] "A sintered sagger for new energy automotive electronic ceramics and its manufacturing method" (CN106630977A) patented technology uses corundum sand, kaolin, sodium humate and zirconia as raw materials, and is fired at high temperature after dry pressing. It has high strength, but due to the single phase, the thermal shock performance of the material is low

[0006] "A raw material formula for the production of saggers" (CN1240775A) patented technology, using ground stone, burnt gemstone, purple mother festival, Inner Mongolian soil, quartz glass, fossil powder and raw stone powder as raw materials, the raw materials are mixed and ground by a ball mill to make the raw materials evenly , but too many impurities lead to a high amount of liquid phase, which makes the strength of the material low and the service life short