Preparation method of high density nickel cobalt lithium manganate positive electrode material

A technology of nickel-cobalt lithium manganese oxide and positive electrode materials, which is applied to battery electrodes, electrical components, circuits, etc., can solve the problems of low material processing performance and low energy density, and achieve low production costs, good rate performance, and preparation methods simple effect

Inactive Publication Date: 2014-05-14
HUNAN SOUNDDON NEW ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] For existing LiNi x co y mn z o 2 To solve the problems of low material processing performance and low energy density, the present invention provides a method for preparing a high-density nickel-cobalt lithium manganate cathode material

Method used

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  • Preparation method of high density nickel cobalt lithium manganate positive electrode material
  • Preparation method of high density nickel cobalt lithium manganate positive electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] ①According to the ion molar ratio nickel Ni:cobalt Co:manganese Mn=0.5:0.2:0.3 to prepare a mixed solution with a concentration of 180g / L, nickel sulfate, cobalt sulfate and manganese sulfate are used to prepare the nickel cobalt manganese solution.

[0027] ② Prepare 150g / L sodium hydroxide solution with pure water.

[0028] ③ Prepare 2mol / L ammonia water with liquid ammonia.

[0029] Prepare the bottom solution containing ammonia water, control the pH value at 10.15, the concentration of ammonia water is 6g / L, the temperature is 62°C, the stirring speed is 120r / min, and the metering pumps of ① solution, ② solution, and ③ solution are simultaneously fed, and turned on Solid content regulating valve, when the solid content is controlled at 160g / L, open the overflow discharge valve, pass through the particle size analyzer during the precipitation reaction, and observe the spherical shape with a microscope. The feeding time is 2h, the temperature is 55°C, and the pH is c...

Embodiment 2

[0034] ① Prepare a mixed solution with a concentration of 180g / L according to the ion molar ratio Ni: Co: Mn = 1:1:1. Nickel sulfate, cobalt chloride, and manganese sulfate are used to prepare the nickel-cobalt-manganese solution.

[0035]② Prepare 150g / L sodium hydroxide solution with pure water.

[0036] ③ Prepare 2mol / L ammonia water with liquid ammonia.

[0037] Prepare the bottom solution containing ammonia water, control the pH value at 11.15, the concentration of ammonia water is 8g / L, the temperature is 58°C, the stirring speed is 150r / min, and the metering pumps of ① solution, ② solution, and ③ solution are fed simultaneously, and turn on Solid content regulating valve, when the solid content is controlled at 500g / L, open the overflow discharge valve, pass through the particle size analyzer during the precipitation reaction, and observe the spherical shape with a microscope. The feeding time is 2h, the temperature is 55°C, and the pH is controlled at 11.5. After the ...

Embodiment 3

[0040] ① Prepare a mixed solution with a concentration of 180g / L according to the ion molar ratio Ni: Co: Mn = 0.4:0.2:0.4. Nickel sulfate, cobalt chloride, and manganese sulfate are used to prepare the nickel-cobalt-manganese solution.

[0041] ② Prepare 150g / L sodium hydroxide solution with pure water.

[0042] ③ Prepare 2mol / L ammonia water with liquid ammonia.

[0043] Prepare the bottom liquid containing ammonia water, control the pH value at 10.55, the concentration of ammonia water is 7g / L, the temperature is 60°C, the stirring speed is 130r / min, and the metering pumps of ① solution, ② solution, and ③ solution are simultaneously fed, and turned on Solid content regulating valve, when the solid content is controlled at 800g / L, open the overflow discharge valve, pass through the particle size analyzer during the precipitation reaction, and observe the spherical shape with a microscope. The feeding time is 2h, the temperature is 55°C, and the pH is controlled at 11.5. Aft...

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Abstract

The invention discloses a preparation method of a high density nickel cobalt lithium manganate positive electrode material, LiNixCoyMnzO2. The preparation method comprises the following steps: firstly, mixing a nickel salt solution, a cobalt salt solution and a manganese salt solution according to a certain mol ratio, adding the mixed solution, a complexing agent solution and a precipitant solution together to a stirring reaction kettle with a base solution, fully reacting, carrying out solid-liquid separation, and washing and drying to obtain a globular nickel cobalt manganese oxyhydroxide precursor; calcining the precursor at the temperature of 350-900 DEG C for 2-20 hours to obtain a globular nickel cobalt manganese oxide precursor, and smashing the globular nickel cobalt manganese oxide precursor at high speed to obtain a mono-crystalline nickel cobalt manganese oxide precursor; mixing a lithium source and the mono-crystalline precursor according to a certain mol ratio, calcining at the temperature of 700-980 DEG C for 2-20 hours, and smashing and classing to obtain the mono-crystalline nickel cobalt lithium manganate positive electrode material. The preparation method provided by the invention has the advantages that the compacted density of the prepared nickel cobalt lithium manganate material is large, the specific capacity is high, the rate property and consistency are good, the preparation method is simple, and the preparation process is easy to control and operate.

Description

technical field [0001] The invention relates to a method for preparing a high-density nickel-cobalt lithium manganate cathode material, and belongs to the technical field of preparation of electrochemical power source materials. Background technique [0002] The current commercial positive electrode materials mainly include lithium cobalt oxide, lithium manganate, lithium nickel cobalt manganese oxide and lithium iron phosphate. Lithium cobalt oxide occupies a large market for 3C electronic products. Lithium cobalt oxide has a high discharge platform, high capacity, and cycle The performance is good, and the production process is easy to control, and the product performance is stable. However, its disadvantages are that cobalt is toxic and resources are limited, the price of raw materials is high, thermal stability, safety performance and high rate performance are poor, and its performance improvement potential is limited. [0003] With the rapid development of electronic p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525
CPCH01M4/505H01M4/525Y02E60/10
Inventor 商士波刘洪金张小艳吴传勇刘鹏
Owner HUNAN SOUNDDON NEW ENERGY
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