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Method for preparing nickel cobalt lithium aluminate cathode material

A technology of lithium nickel cobalt aluminate and positive electrode materials, applied in battery electrodes, electrical components, circuits, etc., can solve the problems of unstable material performance, poor electrochemical stability, uneven particle distribution, etc., to simplify the production process, Good spherical shape and good material uniformity

Inactive Publication Date: 2013-06-26
HUNAN SOUNDDON NEW ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The solid-phase method has a simple process and low cost, but has poor electrochemical stability, uneven particle distribution, and irregular crystal appearance; the co-precipitation method has a relatively simple process, high material capacity, high compaction density for battery production, and good cycle performance. At present, Li(NixCoyAlz)O is synthesized as a cathode material for nickel-cobalt lithium aluminate battery 2 Relatively good method, but requires high temperature and high energy consumption; other methods have the problem of unstable material properties

Method used

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  • Method for preparing nickel cobalt lithium aluminate cathode material
  • Method for preparing nickel cobalt lithium aluminate cathode material
  • Method for preparing nickel cobalt lithium aluminate cathode material

Examples

Experimental program
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Effect test

Embodiment 1

[0026] ①Use pure water to prepare nickel-cobalt-aluminum molar ratio of 0.8:0.15:0.05 and metal ion concentration of 120g / L

[0027] Mixed solution, nickel cobalt aluminum solution preparation with nickel sulfate, cobalt sulfate, aluminum nitrate.

[0028] ② Prepare 150g / L sodium hydroxide solution with pure water.

[0029] ③ Prepare 2mol / L ammonia water with liquid ammonia.

[0030] Prepare the bottom solution containing ammonia water and sodium hydroxide, control the pH value at 10.15, the concentration of ammonia water is 6-8g / L, the temperature is 58-62°C, the stirring speed is 120r / min, through ① solution, ② solution, ③ solution The metering pump feeds at the same time, open the solid content regulating valve, and when the solid content is controlled at 160-1800g / L, open the overflow discharge valve, observe the spherical shape through the particle size analyzer and microscope during the precipitation reaction, and adjust the pH value and ammonia water in time concentra...

Embodiment 2

[0033] ① Use pure water to prepare a mixed solution with a molar ratio of nickel-cobalt-aluminum elements of 0.7:0.2:0.1 and a metal ion concentration of 150g / L. The nickel-cobalt-aluminum solution is prepared with nickel nitrate, cobalt nitrate, and aluminum nitrate.

[0034]② Prepare 120g / L sodium hydroxide solution with pure water.

[0035] ③ Prepare 3mol / L ammonia water with liquid ammonia.

[0036] Prepare the bottom solution containing ammonia water and sodium hydroxide, control the pH value at 10.05, the concentration of ammonia water is 6-8g / L, the temperature is 55-59°C, the stirring speed is 120r / min, pass through ① solution, ② solution, ③ solution The metering pump feeds at the same time, open the solid content regulating valve, and when the solid content is controlled at 180-200g / L, open the overflow discharge valve, observe the spherical shape through the particle size analyzer and microscope during the precipitation reaction, and adjust the pH value and ammonia w...

Embodiment 3

[0039] ① Use pure water to prepare a mixed solution with a molar ratio of nickel-cobalt-aluminum elements of 0.75:0.15:0.1 and a metal ion concentration of 120g / L. The nickel-cobalt-aluminum solution is prepared with nickel nitrate, cobalt nitrate, and aluminum nitrate.

[0040] ② Prepare 150g / L sodium hydroxide solution with pure water.

[0041] ③ Prepare 3mol / L ammonia water with liquid ammonia.

[0042] Prepare the bottom solution containing ammonia water and sodium hydroxide, control the pH value at 10.35, and the concentration of ammonia water at 9-11g / L,

[0043] The temperature is 58-62°C, the stirring speed is 120r / min, and the metering pumps of ①solution, ②solution, and ③solution are fed simultaneously, and the solid content regulating valve is opened. When the solid content is controlled at 180-200g / L, the overflow outlet is opened. Material valve, during the precipitation reaction process, observe the spherical shape through the particle size analyzer and microscop...

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Abstract

The invention discloses a method for preparing a nickel cobalt lithium aluminate cathode material. The method comprises the following steps of: uniformly mixing a nickel salt solution, a cobalt salt solution and an aluminum salt solution in a certain mole ratio of metal ions; adding a complexing agent solution, a precipitator solution and a metal salt solution together into a high-speed stirring reaction kettle with a base solution, and performing precipitation reaction; after complete reaction, performing oxidizing reaction on discharged slurry and an oxidizing agent with certain concentration in an alkaline environment; after the oxidizing reaction is finished, performing solid liquid separation on the slurry, washing in pure water, and drying to obtain a nickel cobalt aluminum hydroxyl oxide precursor of a lithium ion battery cathode material; fully mixing the precursor with a lithium source, and performing multi-step sintering in an oxygen atmosphere; and performing crushing and subsequent treatment on a material obtained by sintering, and thus obtaining the nickel cobalt lithium aluminate cathode material. The method is low in equipment requirement, simple in flow, low in energy consumption and low in waste. The produced material is high in tap density and high in capacity.

Description

technical field [0001] The invention relates to a preparation method of a lithium battery positive electrode material, especially Li(NixCoyAlz)O, a nickel-cobalt lithium aluminate positive electrode material 2 method of preparation. Background technique [0002] As a new generation of green and environmentally friendly power supply, lithium batteries have the advantages of high energy density and high discharge platform, and are widely used in 3C and power tool electronic products such as mobile phones, cameras, and notebook computers. With the development of lithium battery technology, it is required to have the characteristics of high energy, high power and low cost. The positive electrode material of lithium battery is an important part of lithium battery and the main factor affecting the performance of lithium battery. Now the commercialized positive electrode material mainly includes LiCoO 2 , LiMnO 4 , Li(NixCoyMnz)O 2 , Li(NixCoyAlz)O 2 and LiFePO 4 , for 3C ele...

Claims

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Application Information

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IPC IPC(8): H01M4/525
CPCY02E60/10
Inventor 刘力玮商士波吴传勇其他发明人请求不公开姓名
Owner HUNAN SOUNDDON NEW ENERGY
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