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CN-121974667-A - Reactor of sodium ion positive electrode material with high thermal shock stability and preparation method

CN121974667ACN 121974667 ACN121974667 ACN 121974667ACN-121974667-A

Abstract

The invention discloses a reactor for a sodium ion positive electrode material with high thermal shock stability and a preparation method thereof, and belongs to the technical field of reactors, wherein the reactor comprises, by weight, 20-30% of cordierite, 2-10% of talcum powder, 20-22% of mullite, 18-20% of tabular corundum, 12-18% of activated alumina, 4-8% of molybdenum trioxide, 5-6% of Guangxi white mud, 3-10% of aluminum silicate fiber fabric, 4-8% of a binding agent, and 60% of a aluminum dihydrogen phosphate solution as the binding agent, wherein the aluminum silicate fiber fabric is subjected to high-temperature pyrolysis treatment. According to the invention, the proportion of the particle sizes of cordierite and mullite is regulated, so that a compact network skeleton structure is formed in the reactor matrix, the stacking density and strength are optimized, the thermal stress is effectively dispersed, and cracks and flaking caused by sudden temperature changes in the process of high-temperature repeated use are reduced, thereby improving the thermal shock stability of the reactor.

Inventors

  • YANG LIANDI
  • WANG XUEYU
  • WANG YILONG
  • WANG JINGFU
  • QING DA
  • YANG QIANG
  • WANG JIAN
  • YANG NING
  • LIU ZUOTAO
  • LI HONG

Assignees

  • 唐山国亮新能源研究院有限公司

Dates

Publication Date
20260505
Application Date
20260129

Claims (10)

  1. 1. The reactor for the sodium ion positive electrode material with high thermal shock stability is characterized by comprising, by weight, 20-30% of cordierite, 2-10% of talcum powder, 20-22% of mullite, 18-20% of plate-shaped corundum, 12-18% of activated alumina, 4-8% of molybdenum trioxide, 5-6% of Guangxi white mud, 3-10% of aluminum silicate fiber fabric and 4-8% of binding agent; The binding agent is aluminum dihydrogen phosphate solution with the concentration of 60 percent, and the aluminum silicate fiber fabric is subjected to high-temperature pyrolysis treatment.
  2. 2. The reactor of claim 1, wherein the cordierite and mullite have a particle size range of 0.2-3 mm, and the talc, platy corundum, activated alumina, molybdenum trioxide and Guangxi white clay all have a particle size of 0.04-0.08 mm.
  3. 3. The reactor of claim 1, wherein the reactor has a bulk density of 1.9 to 2.1g/cm 3 .
  4. 4. The reactor of claim 1, wherein the porosity of the reactor is 22-30%.
  5. 5. A method for preparing the reactor for a sodium ion positive electrode material with high thermal shock stability according to any one of claims 1 to 4, comprising the following steps: s1, performing high-temperature pyrolysis treatment on aluminum silicate fiber fabrics to remove adhesive on the fiber surfaces; s2, soaking the aluminum silicate fiber fabric subjected to the high-temperature cracking treatment in the step S1 in a 60% aluminum dihydrogen phosphate solution to obtain a soaked fiber fabric; S3, weighing cordierite particles and mullite particles according to a proportion, uniformly mixing, and then adding an aluminum dihydrogen phosphate solution for secondary mixing to obtain wet particles; s4, weighing fine powder of talcum powder, platy corundum, activated alumina, molybdenum trioxide and Guangxi white mud according to a proportion, and mixing with the impregnated fiber fabric and wet granules to obtain a mixture; s5, ageing the mixture at room temperature for 24-48 hours to obtain a raw blank; s6, extruding the green body material into a die, and performing compression molding by a hydraulic press to obtain a green body; S7, drying the blank until the moisture content is 0.5-0.8%; and S8, firing the dried green body at high temperature, and cooling to obtain the reactor.
  6. 6. The method according to claim 5, wherein the pyrolysis treatment in step S1 is performed at a rate of 5-10 ℃/min, heating to 500-600 ℃, maintaining the temperature for 1-2 hours, and naturally cooling to room temperature.
  7. 7. The method according to claim 5, wherein the pressure of the press molding in step S6 is 130 to 160KPa, and the pressing time is 10 to 15S.
  8. 8. The method according to claim 5, wherein the drying process in step S7 is performed in two stages, the first stage is drying at 30-50 ℃ for 2-3 hours and the second stage is drying at 80-100 ℃ for 4-6 hours.
  9. 9. The method according to claim 5, wherein the high-temperature firing in step S8 is performed at a temperature of not more than 5 ℃ per minute and a firing time of 10 to 14 hours, and the temperature is raised to 1300 to 1400 ℃.
  10. 10. The preparation method according to any one of claims 5 to 9, wherein the reactor is suitable for sintering of LiCoO 2 、LiFePO 4 , NCM ternary cathode materials.

Description

Reactor of sodium ion positive electrode material with high thermal shock stability and preparation method Technical Field The invention belongs to the technical field of reactors for sodium ion anode materials, and particularly relates to a reactor for a sodium ion anode material with high thermal shock stability and a preparation method thereof. Background Sodium-ion batteries (rechargeable batteries) are a type of secondary battery that relies primarily on Sodium ions to move between a positive electrode and a negative electrode to operate on a principle similar to that of lithium ion batteries. The electrode material used by sodium ions is mainly sodium salt, and compared with lithium salt, the electrode material has the advantages of more abundant reserves and lower price. Sodium ions are a cost-effective alternative when weight and energy density requirements are not high, since they are of a larger radius than lithium ions. Compared with a ternary positive electrode material of a lithium ion battery, the lithium ion battery has the advantages that sodium ions have multiple advantages of being rich in sodium salt raw material reserves and low in cost, the cost of raw materials can be reduced by half compared with a ternary positive electrode material of the lithium ion battery by a main technical route (polyanion compounds, prussian blue compounds and the like), due to the characteristic of sodium salts, low-concentration electrolyte is allowed to be used for reducing the cost, sodium ions do not form an alloy with aluminum, aluminum foils can be used as current collectors for a negative electrode, the cost of the current collectors can be reduced by about 8%, the weight of the current collectors can be reduced by about 10%, and in addition, the sodium ions have no overdischarge characteristic and are allowed to discharge to zero volt. At present, the energy density of sodium ions can exceed 150Wh/kg, can be compared with partial lithium iron phosphate battery products, has obvious cost advantages, and is expected to replace the traditional lead-acid battery in the field of large-scale energy storage. Along with the wide application of sodium ions in the fields of energy storage, starting power supply, power battery and the like, the production scale of sodium ion anode materials is continuously enlarged, and the requirements for high-quality sintering reactors are also increasing. The sintering process of the positive electrode material is the most core link in the production process, and the performance of the reactor serving as a carrier of the mixture of the positive electrode material precursor and the sodium source directly influences the quality of the sintered product. However, the traditional reactor is easy to chemically react with materials in the use process, so that failure phenomena such as wrinkling, peeling, cracking and the like are caused, the quality of products is affected, and the production cost is increased. In the sintering process of the sodium ion positive electrode material, the thermal shock stability of the reactor is one of the key factors influencing the service life and the quality of the sintered product. The reactor for sintering the sodium ion positive electrode material needs to be repeatedly used in a high-temperature environment, and frequent temperature changes can cause thermal stress in the reactor material, so that the structural integrity and the performance stability of the reactor material are affected. In the prior art, oxides in sodium-containing compound reactor materials react to generate eutectic matters with low melting point, the eutectic matters are easy to soften or melt at high temperature to damage the microstructure of the reactor, and phase transition caused by sodium ion reaction is accompanied with volume change to generate thermal shock cracks together with thermal circulation, so that peeling and peeling occur under the action of thermal stress and mechanical force to cause damage. Therefore, the novel reactor material can maintain good thermal shock stability and chemical stability in a high-temperature environment, prolong the service life and reduce the production cost. Disclosure of Invention In order to solve the problems of poor thermal shock stability, poor chemical stability and short service life in the prior art, the invention provides a reactor for a sodium ion positive electrode material with high thermal shock stability and a preparation method thereof. In the first aspect, the invention provides a reactor for a sodium ion positive electrode material with high thermal shock stability, which comprises, by weight, 20-30% of cordierite, 2-10% of talcum powder, 20-22% of mullite, 18-20% of plate-shaped corundum, 12-18% of activated alumina, 4-8% of molybdenum trioxide, 5-6% of Guangxi white mud, 3-10% of aluminum silicate fiber fabric and 4-8% of bonding agent; The binding agent is aluminum dihydrogen phosphate solution with the co