Preparation method of wet-processed aluminium-coated lithium ion battery cathode material

A lithium-ion battery and cathode material technology, which is applied to battery electrodes, circuits, electrical components, etc., can solve the problems of poor high-temperature safety performance and high-temperature cycle performance, difficult to control electrochemical performance, and difficult to mix materials uniformly. Good high temperature safety and cycle characteristics, easy control of coating process conditions, good uniformity effect

Active Publication Date: 2012-01-04
山东天骄新能源有限公司
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Problems solved by technology

The disadvantages of this method are: the solid phase diffusion rate 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; its practical application is affected
[0004] However, the current pure nickel-cobalt-manganese ternary materials are suitable for general batteries, and the high-temperature safety performance and high-temperature cycle performance are not very good.

Method used

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  • Preparation method of wet-processed aluminium-coated lithium ion battery cathode material
  • Preparation method of wet-processed aluminium-coated lithium ion battery cathode material
  • Preparation method of wet-processed aluminium-coated lithium ion battery cathode material

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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 ·H 2 O: NaOH=0.2 ammonia water. Put the two mixed solutions into the reaction kettle in parallel, and under the protection of nitrogen or rare gas, the reaction is controlled in a continuous reaction mode, the pH value is controlled between 10-12, and the temperature is 50-60°C. After the reaction is completed, filter and wash to The pH value of the washing water is less than 8, and it is dried at 110°C to obtain Ni 0.5 co 0.2 mn 0.3 (OH) 2 Precursor.

[0035] Dissolve aluminum isopropoxide in isopropanol to prepare a 30 g / L solution of aluminum isopropoxide in isopropanol. The coating amount of the designed material is 0.02mol (Al / (Ni+Co+Mn)), and the two solutions are mixed and adde...

Embodiment 2

[0045] 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 ·H 2 O: NaOH=0.2 ammonia water. Add the two mixed solutions into the reaction kettle in parallel, react under the protection of nitrogen, control the pH value between 10-12, and the temperature is 50-60°C, filter and wash until the pH value of the washing water is less than 8, and dry at 120°C. Get Ni 0.70 co 0.15 mn 0.15 (OH) 2 Precursor.

[0046] Dissolve aluminum isopropoxide in isopropanol to prepare a 100 g / L solution of aluminum isopropoxide in isopropanol. The coating amount of the designed material is 0.02mol (Al / (Ni+Co+Mn)), and the two solutions are mixed and added with a solid content of 40% Ni 0.7 co 0.15 mn 0.15 (OH) 2 In the precursor solution, the temperature of the rea...

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Abstract

The invention relates to a preparation method of wet-processed aluminium-coated lithium ion battery cathode material. The method comprises the following steps: preparing a precursor and preparing size with a certain solid content; dropwise adding an isopropanol solution in which aluminium isopropoxide is dissolved in advance into the precursor size at a certain speed, wherein the dropwise adding speed, the temperature and the stirring speed are controlled appropriately; after the dropwise add of the isopropanol solution ends, aging for a certain time, filtering, washing and drying to obtain a aluminium-coated Ni-Co-Mn precursor; and evenly mixing the aluminium-coated precursor with lithium salt, carrying out a high-temperature treatment for a certain time, cooling and smashing to obtain the wet-processed aluminium-isopropoxide-coated lithium ion battery cathode material. The wet-processed aluminium-isopropoxide-coated lithium ion battery cathode material provided by the invention has better high-temperature safety performance and cycle characteristic, and can be used for power batteries.

Description

technical field [0001] The invention relates to a lithium ion battery cathode material, in particular to a preparation method of an aluminum-coated lithium ion battery cathode material. 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 ) 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 ternary material is a new type of positive electrode material for lithium-ion batteries developed in recent years. It concentrates LiCoO 2 and LiMn 2 o 4 The advantages of materials have attracted extensive attention from researchers. Because two-thirds (or more) of cobalt in lithium cobalt oxide...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1391H01M4/505H01M4/525
CPCY02E60/122Y02E60/10
Inventor 王伟东叶红齐
Owner 山东天骄新能源有限公司
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