Preparation method for high-tapping-density modified nickel-cobalt lithium manganate positive material

A technology of nickel cobalt lithium manganate and positive electrode material, applied in battery electrodes, electrical components, circuits, etc., can solve the problems of complicated preparation process, wide particle size distribution, difficult to uniform particle size, etc., and achieve excellent cycle performance and good dispersion effect. , the effect of easy temperature adjustment

Active Publication Date: 2015-01-21
RUYUAN YAO AUTONOMOUS COUNTY DONGYANGGUANG FORMED FOIL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ternary cathode materials have the advantages of low cost, high specific capacity, high voltage platform, good overshoot resistance, and excellent thermal stability. At present, the methods for synthesizing ternary cathode materials are mainly high-temperature solid-phase method, sol-gel method, Combustion method, molten salt method, but these methods or the preparation process are complicated, or the performance of the prepared material is not good
The ternary positive electrode material reported in Chinese patent CN 101621125A is mostly a spherical shape formed by the aggregation of multiple particles, and the tap density can reach 2.0-2.5g/cm 3 , but it is difficult to further improve
In addition, the particle size of the polycrystalline particles formed by the aggregation of multiple particles is difficult to be uniform, and the particle size distribution is wide. The polycrystalline particles have a large specific surface area, and are easy

Method used

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  • Preparation method for high-tapping-density modified nickel-cobalt lithium manganate positive material
  • Preparation method for high-tapping-density modified nickel-cobalt lithium manganate positive material
  • Preparation method for high-tapping-density modified nickel-cobalt lithium manganate positive material

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Experimental program
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Effect test

Embodiment 1

[0037] NiSO 4 , MnSO 4 、CoSO 4 According to the molar ratio Ni:Co:Mn=5:2:3, the mixed aqueous solution of nickel manganese cobalt salt is prepared, the total concentration is 1mol / L, and 1% magnesium acetate and 1% cerium nitrate are added to the solution, and another 2.0mol / L NaOH solution and 6.0mol / L ammonia water, the multi-component salt solution, NaOH solution, and ammonia water are respectively input into the reaction vessel filled with sodium citrate in advance with a metering pump for reaction. Under the protection of nitrogen, control the temperature of the reactor to 60°C, control the flow of alkali to make the pH value 11.0, and the stirring speed to 500r / min. The reactor feed liquid is naturally discharged, and the feed is continuously fed for 60 hours. Transfer the material in the kettle to the aging tank, add 2mol / L NaOH solution to adjust the pH to 12.0, stir for 4.0h for surface treatment, then filter for solid-liquid separation, wash the solid product obta...

Embodiment 2

[0043] NiCl 2 , CoCl 2 , MnCl 2 Prepare a nickel-manganese-cobalt mixed aqueous solution according to the molar ratio Ni:Co:Mn=4:2:4, the total concentration is 2.5mol / L, and add 1% aluminum nitrate and 2% potassium tantalate to the solution to prepare 10.0mol / L NaOH solution and ammonia solution with a concentration of 6.0mol / L, use a metering pump to respectively input the multi-component salt solution, sodium hydroxide solution, and ammonia solution into the reaction vessel filled with EDTA in advance for reaction. Under the condition of argon protection, the temperature of the reaction vessel is controlled at 50°C, the pH value is 10.8, the stirring speed is 800r / min, the material liquid in the reaction vessel is discharged naturally, the continuous feeding is stopped for 60 hours, and the material in the reaction vessel is transferred to mature tank, add 4mol / L NaOH solution to adjust the pH to 11.5, stir for 1.0h for solid-liquid separation until the pH value of the w...

Embodiment 3

[0046] Ni(NO 3 ) 2 , Co(NO 3 ) 2 , Mn(NO 3 ) 2 According to the molar ratio of Ni:Co:Mn=3:3:3, prepare nickel-manganese-cobalt mixed aqueous solution with a total concentration of 2.5mol / L, and add 0.5% zinc chloride and 0.5% indium chloride to the solution to prepare 10.0 The mol / L NaOH solution and the 6.0mol / L ammonia solution are used to input the multiple salt solution, the NaOH solution and the ammonia solution into the reaction vessel filled with sodium tartrate in advance with a metering pump for reaction. Under the condition of argon protection, the temperature of the reaction vessel is controlled at 50°C, the pH value is 10.8, the stirring speed is 200r / min, the material liquid in the reaction vessel is discharged naturally, the continuous feeding is stopped for 72 hours, and the material in the reaction vessel is transferred to mature tank, add 5mol / L NaOH solution to adjust the pH to 11.8, stir for 1.0h for solid-liquid separation until the pH value of the was...

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Abstract

The invention relates to a method for preparing a nickel-cobalt lithium manganatepositive material. The method comprises the following steps: carrying out coprecipitation reaction, drying, carrying out uniform rheological phase mixing, and calcining at high temperature so as to obtain high-tapping-density ball-shaped nickel-cobalt lithium manganate. The positive material prepared by adopting the method has the advantages of uniform element distribution, uniform particle size distribution, high tapping density, small specific surface area and good electrochemical property; a preparation process is simple, and the industrial production is easily realized; and the production cost also can be reduced and the stability of the quality of a product can be improved.

Description

technical field [0001] The invention relates to a preparation method of a positive electrode material of a lithium ion battery, in particular to a preparation method of a high-tap modified nickel-cobalt lithium manganese oxide positive electrode material. technical background [0002] Cathode materials are an important part of determining the performance of lithium-ion batteries. At present, the most mature cathode material LiCoO has been industrialized 2 , the research is relatively mature, and the comprehensive performance is excellent, but the price is expensive, the toxicity is high, and the safety performance is flawed. Especially under the condition of overcharge, the material is unstable and easy to react with the electrolyte, and the application field is greatly affected; in addition, LiCoO 2 Only half of the lithium can be reversibly deintercalated, which limits the increase in the capacity of lithium-ion batteries and cannot meet the needs of electric vehicle powe...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525
CPCH01M4/505H01M4/525Y02E60/10
Inventor 朱金保
Owner RUYUAN YAO AUTONOMOUS COUNTY DONGYANGGUANG FORMED FOIL CO LTD
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