With the rapid development of new energy, lithium battery used in various industries, lithium battery anode material in the lithium battery material system occupies a large proportion, lithium battery anode material using high temperature solid phase production, the saggar as the main burning material in recent years has been widely concerned, the saggar is difficult to recycle after scrap, resulting in environmental pollution and waste of resources. Therefore, the preparation of high-performance saggar that can be reused many times is of great significance to the development of lithium batteries, resource conservation and environmental protection.
saggar
The main crystalline phases of saggar are generally mullite, cordierite and magnesium-aluminum spinel. These phases have high refractoriness, high strength, excellent thermal shock resistance, low thermal expansion coefficient and strong resistance to Li and CO ion corrosion. Domestic scholars have been deeply studying the effects of firing temperature, type of substrate and type of binder on the performance of the saggar. In this work, the effects of aggregate type and particle size (mullite, magnesium-aluminum spinel, cordierite) on the performance of the saggar are to be discussed.
cordierite
1. Test:
1.1 Raw materials and test plan
1.2 Test process and performance testing
The mass fraction of large particles (1~3mm), medium particles (≤1mm) and fine powder (≤0.074mm) is 30%, 30% and 40%, respectively, as shown in Table 2. The raw materials are mixed evenly in the mixer, and then mixed with water, and then poured into the mold of 40mm×40mm×140mm for vibration molding. After 24 hours of natural curing in the mold, the mold was released, and then kept at 110℃ for 24 hours of drying. After drying, the bar sample was kept at 1400℃ for 4 hours of heat treatment for use.
According to GB/T2997-2000 test sample apparent porosity, bulk density; According to GB/T3001-2000 test sample flexural strength at room temperature; Compressive strength at room temperature according to GB/T3997.2-1998 test sample. The test of thermal shock resistance is to put the standard brick sample after heat treatment at 1550℃ for 4h directly into the furnace at 1100℃ for 20min, take it out and keep it in circulating water at normal temperature for 3min, and then take it out and leave it for natural storage for 5min. This process is repeated until the specimen is broken or large lumps appear. The residual flexural strength of the sample after three thermal shocks is used as the evaluation index of the thermal shock resistance of the sample, and the flexural strength of the sample at 1100℃ is measured.