Search

CN-118145981-B - Corrosion-resistant sagger and preparation method thereof

CN118145981BCN 118145981 BCN118145981 BCN 118145981BCN-118145981-B

Abstract

The invention relates to the field of materials, in particular to a corrosion-resistant sagger, a preparation method and application. The sagger raw materials comprise spinel, petalite, metallic silicon, sodium zirconium phosphate, polyvinyl alcohol and water. The sagger provided by the invention can replace a graphite sagger used for a negative electrode material, has low porosity and long service life, greatly improves the cost performance of a product, and can effectively reduce the cost of a production enterprise.

Inventors

  • WANG JIABANG
  • FAN LI
  • TIAN FENG
  • WANG HUANPING
  • SU LIWEI

Assignees

  • 浙江吉昌锂电科技有限公司

Dates

Publication Date
20260512
Application Date
20230713

Claims (9)

  1. 1. The corrosion-resistant sagger is characterized by comprising, by weight, 40 parts of spinel, 20-30 parts of petalite, 20-30 parts of metallic silicon, 8-12 parts of sodium zirconium phosphate, 2-3 parts of polyvinyl alcohol and 80-120 parts of water.
  2. 2. The sagger according to claim 1, wherein the raw materials of the sagger comprise the following components, by weight, 40 parts of spinel, 25 parts of petalite, 25 parts of metallic silicon, 10 parts of sodium zirconium phosphate, 2.5 parts of polyvinyl alcohol and 100 parts of water.
  3. 3. A sagger according to claim 1 or 2, characterized in that the spinel is selected from sintered spinel or fused spinel.
  4. 4. A sagger according to claim 1 or 2, characterized in that the spinel is an electrofused spinel.
  5. 5. The sagger according to claim 1 or 2, characterized in that the Li 2 O content in petalite is not lower than 4.0%.
  6. 6. The method for preparing a sagger according to any one of claims 1 to 5, comprising the steps of: 1) Ball milling powder, namely grinding spinel, metallic silicon, petalite, sodium zirconium phosphate, polyvinyl alcohol and water by a ball mill, and granulating to obtain a sagger granulating material for later use; 2) Pouring the prepared sagger manufactured granules into a sagger mould, pressing and forming, taking out, standing and placing for 12-24 hours, and then drying; 3) And (3) loading the dried sagger into a kiln, sintering for 3-5 hours in the earlier stage without nitrogen, then introducing nitrogen, preserving heat and sintering for 0.5-1 hour, and then slowly cooling.
  7. 7. The method according to claim 6, wherein in the step 2), the drying condition is performed for 24 to 72 hours at a temperature of 50 to 60 ℃.
  8. 8. The method according to claim 6, wherein in the step 3): nitrogen-free sintering, wherein the sintering temperature is 1340-1370 ℃; After nitrogen is introduced, the pressure of nitriding gas is 0.02-0.04 MPa, the content of O 2 in the furnace atmosphere is less than 0.01%, and the final nitriding temperature is 1340-1370 ℃.
  9. 9. The sagger according to any one of claims 1 to 5 for sintering a negative electrode material of a lithium battery.

Description

Corrosion-resistant sagger and preparation method thereof Technical Field The invention relates to the field of materials, in particular to a corrosion-resistant sagger and a preparation method thereof. Background The lithium ion battery generally consists of three parts, namely a positive electrode material, a negative electrode material and an electrolyte solution. The positive electrode material mainly comprises lithium cobaltate (LiCoO 2), lithium manganate (LiMn 2O4), lithium nickelate (LiNiO 2), lithium iron phosphate (LiFePO 4) and other materials. The negative electrode is mainly graphite. In the production of the lithium ion battery cathode material, the conventional sagger is a graphite sagger, the price of the graphite material is greatly improved due to the environmental protection requirement and supply and demand, the purchase price of 330 x 210 single graphite sagger is 1800-2400 yuan/unit, the cost is high, the processing cost and the purchase cost of the graphite party of a graphite sagger producer reach the cost, the drawn central graphite is used as profit, if not used, the profit is not obtained, the central blocks of a plurality of producers are piled up like mountains, the use cost of the cathode material producer is 170-200 yuan/unit, and how the cathode material producer reduces the production and use cost becomes one of the assessment indexes of production units. In addition, the sintering temperature of the anode material is 1000-1100 ℃, the main component of the anode material is graphitized needle petroleum coke, other components are introduced to modify the surface of the anode material, the binder is mainly resin, special asphalt and the like, tar and other various sticky substances are easy to generate in the production process, and are adhered to the surface of a graphite crucible or are adhered together through holes of the graphite crucible, so that the anode material is not easy to clean, and the graphite sagger needs to be cleaned every time and is broken in the cleaning process. Therefore, manufacturers purchase graphite sagger prepared by high-purity, high-density and low-porosity graphite, but due to the characteristics of graphite, the graphite sagger has high melting point, small shrinkage and high porosity in the sintering process, and adopts a multi-dip-coating mode to improve the density and reduce the porosity, and three-dip four-firing is generally needed, so that the price is high, the surface porosity still reaches 10-15%, the density is very high, and the porosity is 8%. In order to solve the problem, the use cost is reduced, and the surface glazing treatment is carried out on the anode material sagger by combining coal coking to prevent the furnace door from coking and tar adhesion surface glazing process, so that the problem can be effectively solved, but in the use process, the coated glaze is found to have glazing phenomenon in long-term use due to low temperature, and simultaneously, the upper part and part of external glaze are easy to be adhered with a roller way at the bottom, so as to solve the new problem. The sagger is prepared by adopting a ceramic process, the ceramic material has higher strength and lower porosity than graphite by 0, the problems of adhesion and cleaning and peeling caused by the decomposition of organic materials in the anode material and the permeation of tar and other organic materials into the sagger can be solved, but the sagger is used for a long time at 1000-1100 ℃ and better thermal shock resistance is required. Therefore, the ceramic sagger is prepared by adopting spinel, metallic silicon, petalite and sodium zirconium phosphate fine powder as raw materials, so that the problems of pore penetration and spalling resistance are solved, and the ceramic sagger has a good service life. Disclosure of Invention In order to solve the problems of the prior anode material sagger applied to the anode material and reduce the use cost of the anode sagger, the application provides a corrosion-resistant sagger. In a first aspect, the application provides a corrosion-resistant sagger, which comprises spinel, petalite, metallic silicon, sodium zirconium phosphate, polyvinyl alcohol and water. Specifically, the raw materials of the sagger comprise, by weight, 40 parts of spinel, 20-30 parts of petalite, 20-30 parts of metallic silicon, 8-12 parts of sodium zirconium phosphate, 2-3 parts of polyvinyl alcohol and 80-120 parts of water. Preferably, the raw materials of the sagger comprise the following components in parts by weight of 40 parts of spinel, 25 parts of petalite, 25 parts of metallic silicon, 10 parts of sodium zirconium phosphate, 2.5 parts of polyvinyl alcohol and 100 parts of water. The sagger comprises: the spinel is selected from sintered spinel or fused spinel, preferably fused spinel; li 2 O in the petalite is more than or equal to 4.0 (the content is not less than 4.0%), and the fineness is less than 10% after 320 meshe