Preparation method of cathode material
A cathode material and powder technology, which is applied in the field of preparation of ternary cathode materials, can solve problems such as poor electrical conductivity and multiple side reactions, and achieve the effects of improving rate performance, improving dispersion, and good electrical conductivity
Active Publication Date: 2020-06-23
无锡凯帕德瑞科技有限公司
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Problems solved by technology
Nickel cobalt lithium aluminate (NCA) cathode material has great advantages over other ternary cathode materials in terms of capacity, thermal stability and price, but the conductivity of NCA cathode material is poor, and direct contact with the electrolyte will cause more side effects
Method used
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Experimental program
Comparison scheme
Effect test
Embodiment 1
[0021] A method for preparing a positive electrode material, comprising:
[0022] Step 1, taking nickel nitrate, cobalt nitrate and aluminum nitrate, and preparing a mixed aqueous solution;
[0023] Step 2, adding ammonia water to the mixed aqueous solution obtained in step 1, reacting for 12 hours, drying the product to obtain the first powder;
[0024] Step 3: Take tungsten powder and lithium hydroxide powder, mix them evenly, put them into a reaction furnace, preheat at 700°C for 30 minutes, then pass in acetylene gas, and react at 800°C for 3 hours to obtain the second powder. The total carbon content in the second powder is 10-15%;
[0025] Step 4, dissolving polyethylene glycol in water to obtain a polyethylene glycol solution, taking the first powder and the second powder and dispersing them in the polyethylene glycol solution to obtain a dispersion;
[0026] Step 5. Take the dispersion obtained in step 4, dry it in an oven at 60°C, sinter at 500°C for 3 hours, then r...
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The invention discloses a preparation method of an anode material. The preparation method comprises the steps that first, a mixed aqueous solution is prepared; second, ammonia water is added into themixed aqueous solution obtained in the first step, and the product is dried to obtain first powder; third, tungsten powder and lithium hydroxide powder are taken, mixed uniformly, placed in a reactionfurnace and preheated for 30 minutes under the temperature of 700 DEG C, then acetylene gas is introduced into the reaction furnace for a reaction for 3 hours under the temperature of 800 DEG C, andsecond powder is obtained; fourth, the first powder and the second powder are taken and dispersed in a polyethylene glycol solution, and a dispersion liquid is obtained; and fifth, the dispersion liquid obtained in the fourth step is taken and dried in an oven under the temperature of 60 DEG C, the product is sintered for 3 hours under the temperature of 500 DEG C, then the temperature is raised to 600 DEG C at the speed of 20 DEG C per hour, the product is sintered for 3 hours, cooled to room temperature, ground and screened, and the anode material is obtained. Through the preparation method,the conductivity of the anode material can be improved; and moreover, tungsten carbide can protect the ternary material, so that side reactions are reduced, and the rate capability of the anode material is improved.
Description
technical field [0001] The invention relates to the technical field of electrode materials. More specifically, the present invention relates to a preparation method of a ternary cathode material. Background technique [0002] Lithium-ion batteries have the advantages of high working voltage, large specific energy, and no memory effect. They have become a new generation of green high-energy batteries and are widely used in 3C products and new energy vehicles. Nickel cobalt lithium aluminate (NCA) cathode material has great advantages over other ternary cathode materials in terms of capacity, thermal stability and price, but NCA cathode material has poor electrical conductivity, and direct contact with electrolyte will cause more side effects. Therefore, there is an urgent need to design a positive electrode material that can overcome the above defects to a certain extent. Contents of the invention [0003] An object of the present invention is to provide a method for pre...
Claims
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IPC IPC(8): H01M4/525H01M10/0525
CPCY02E60/10
Inventor 陈名柱盛琦柳丕云
Owner 无锡凯帕德瑞科技有限公司