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Preparation method of lithium-ion battery cathode material coated aluminum

A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as difficult mixing of materials, slow solid-phase diffusion speed, poor high-temperature safety performance and cycle performance, and easy to achieve The effect of control, superior high temperature stability, and good cycle characteristics

Inactive Publication Date: 2011-12-28
深圳市天骄科技开发有限公司
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  • Claims
  • Application Information

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Problems solved by technology

The disadvantages of this method are: first, the solid phase diffusion speed is slow, the mixing is difficult to be uniform, and there are large differences in the structure and composition of the product, which makes its electrochemical performance difficult to control; second, the bulk density of the synthesized powder material Low, generally achieved tap density is only 1.6 ~ 1.8g / cm 3 , so that the volume specific capacity of lithium nickel cobalt manganese oxide is much lower than that of lithium cobalt oxide, which affects its practical application
[0004] The positive electrode material obtained by the above co-precipitation method is suitable for general batteries. For power batteries, the high temperature safety performance and cycle performance are not very good

Method used

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  • Preparation method of lithium-ion battery cathode material coated aluminum
  • Preparation method of lithium-ion battery cathode material coated aluminum
  • Preparation method of lithium-ion battery cathode material coated aluminum

Examples

Experimental program
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Embodiment 1

[0034] NiSO 4 、CoSO 4 , MnSO 4 Moore than Ni 2+ :CO 2+ :Mn 2+ =5:2:3 ratio mixing, dissolving with deionized water, and being made into the solution that comprehensive ion concentration is 2mol / L. Prepare 4mol / L sodium hydroxide solution, and add NH in the sodium hydroxide solution 3 : NaOH=0.2 ammonia water. Add the two mixed solutions into the reaction kettle in parallel, under the protection of nitrogen or inert gas, control the reaction in a continuous reaction mode, control the pH value between 10-12, and the temperature is 50-60 ° C, when the particle size reaches the requirement, filter Wash until the PH value of the washed water is less than 8, and dry at 120°C to obtain Ni 0.5 co 0.2 mn 0.3 (OH) 2 Precursor.

[0035] Prepare 0.5 mol / L aluminum sulfate solution and 3 mol / L sodium hydroxide solution with deionized water. The coating amount of the design material is 0.02mol (Al / (Ni+Co+Mn)) (referring to the molar ratio of the three metal elements Al to Ni+Co+...

Embodiment 2

[0044] NiCl 2 、CoCl 2 , MnCl 2 Moore than Ni 2+ :Co 2+ :Mn 2+ =70:15:15 ratio mixing, dissolving with deionized water, is made into the solution that comprehensive ion concentration is 2mol / L. Prepare 4mol / L sodium hydroxide solution, and add NH in the sodium hydroxide solution 3 : NaOH=0.2 ammonia water. Put the two mixed solutions into the reaction kettle in parallel, under the protection of nitrogen or inert gas, control the reaction in a continuous reaction mode, control the pH value between 10-12, and the temperature is 50-60 ° C, when the particle size reaches the requirement, filter Wash until the pH value of the washing water is less than 8, and dry at 120°C to obtain Ni 0.70 co 0.15 mn 0.15 (OH) 2 Precursor.

[0045] Prepare 0.5 mol / L aluminum sulfate solution and 3 mol / L sodium hydroxide solution with deionized water. The coating amount of the design material is 0.02mol (Al / (Ni+Co+Mn)) (referring to the molar ratio of the three metal elements Al to Ni+Co+...

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Abstract

The invention relates to a method for preparing aluminum-coated anode materials of lithium-ion batteries, which is characterized in that: firstly, soluble nickel salts, cobalt salts, and manganese salts are formulated into salt solutions, and then mixed with ammonia-water-mixed sodium hydroxide or potassium hydroxide solutions React to form precursor particles, wash and dry; add water to the dried precursor particles to prepare a flowable slurry, stir, and add trivalent aluminum salt solution and sodium hydroxide or potassium hydroxide solution dropwise to the slurry at the same time , to obtain the precursor of nickel hydroxide cobalt manganese coated with aluminum; then mix the precursor with lithium source, and then sinter to obtain the positive electrode material of lithium ion battery coated with aluminum. The present invention has the following obvious advantages: raw materials are easy to obtain; coated The process conditions are easy to control, and it is easy to obtain a relatively uniform coating body; the prepared positive electrode material can make the lithium ion battery have superior high temperature stability and better cycle characteristics.

Description

technical field [0001] The invention relates to a positive electrode material of a lithium ion battery, in particular to a preparation method of the positive electrode material of a lithium ion battery. Background technique [0002] Lithium-ion batteries, which are widely used at present, are undergoing continuous updating and improvement of cathode materials. There are many systems of cathode materials for lithium-ion batteries, and the layered lithium cobalt oxide series (LiCoO 2 ), layered lithium nickel oxide series (LiNiO 2 ) and spinel-like lithium manganese oxide series (LiMn 2 o 4 ). However, there are significant deficiencies in the above-mentioned systems, which affect their practical application. Nickel-cobalt lithium manganate multi-component electrode material is a new type of positive electrode material for lithium-ion batteries developed in recent years. It concentrates LiCoO 2 , LiNiO 2 and LiMnO 2 The advantages of the three materials have attracted ...

Claims

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Application Information

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IPC IPC(8): H01M4/1391H01M4/505H01M4/525
CPCY02E60/122Y02E60/12Y02E60/10
Inventor 王伟东王海涛丁倩倩
Owner 深圳市天骄科技开发有限公司
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