Cobalt-covered lithium ion cell anode material precursor as well as preparation method and application

A technology for lithium-ion batteries and positive electrode materials, applied to battery electrodes, circuits, electrical components, etc., to achieve the effect of increased rate performance and good electronic conductivity

Inactive Publication Date: 2013-10-23
协鑫动力新材料(盐城)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Compared with traditional materials, although ternary materials have considerable advantages, there is still room for further improvement in the performance of ternary materials

Method used

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  • Cobalt-covered lithium ion cell anode material precursor as well as preparation method and application
  • Cobalt-covered lithium ion cell anode material precursor as well as preparation method and application
  • Cobalt-covered lithium ion cell anode material precursor as well as preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Embodiment 1: surface coating tricobalt tetroxide LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 Preparation of cathode material

[0032]Nickel sulfate, cobalt sulfate, and manganese sulfate were prepared in a molar ratio (1:1:1) to prepare 50 L of salt solution with a concentration of 1.8 mol / L. The prepared solution was injected into a reaction kettle with a rotation speed of 250 rps through a metering pump at a rate of 0.4 L / h, and the temperature of the reaction kettle was kept at 50° C. At the same time, inject 20wt% ammonia water and 8mol / L NaOH solution, adjust the flow rate of the alkali solution, and keep the pH value stable between 10-12 through the pH tester. When the salt solution is completely injected into the reactor, the precursor preparation reaction is completed. . After the reaction is completed, the solid-liquid mixture is filtered through the filter, and after washing to neutrality, the filtered solid part is re-added to the reactor, and 1L of the prepared 1mol / L ...

Embodiment 2

[0036] Embodiment 2, adopt the same step as embodiment 1 to prepare the LiNi of surface coating tricobalt tetroxide 1 / 3 co 1 / 3 mn 1 / 3 o 2 The positive electrode material differs in that the oxidizing agent is sodium persulfate.

Embodiment 3

[0037] Example 3, using the same steps as in Example 1 to prepare LiNi coated with tricobalt tetroxide on the surface 1 / 3 co 1 / 3 mn 1 / 3 o 2 The positive electrode material is different in that the concentration of sodium hydroxide is 20wt%.

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Abstract

The invention relates to a cobalt-covered compound polybasic lithium ion cell anode material precursor as well a as preparation method and application. The precursor has the following formula: NixCoy+zMn1-x-y(OH)2, wherein x is more than 0 and less than 0.8, y is more than 0 and less than 0.5 and z is more than 0 and less than 0.05; the precursor is formed by a core part and a nano cobaltosic oxide layer covering the surface of the core; the molecular formula of the core part is as follows: NikConMn1-k-n(OH)2, wherein k is more than 0 and less than 0.8 ad n is more than 0 and less than 0.5. According to the precursor disclosed by the invention, the outer surface of the core part is covered with one layer of nano cobalt hydroxide through a nano technology; and a covering layer is formed by uniformly growing in a liquid phase so that the very good and dense covering layer is formed on a spherical surface. Then, a strong oxidant is added under a strong alkali environment so that the cobalt hydroxide is oxidized into cobalt hydroxyl cobalt oxide and a cobaltosic oxide covering layer is formed on the surface of the material in a following sintering process. The cobaltosic oxide has the very good electronic conduction capability so that the heavy load discharge performance of the material is greatly improved and the material can be more suitable for the requirements of a power battery.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery cathode materials, and in particular relates to a cobalt-coated composite multi-element lithium-ion battery cathode material precursor and a preparation method and application thereof. Background technique [0002] Lithium-ion secondary batteries have the advantages of high specific energy, long cycle life and stable discharge performance, making them ideal power sources for various portable electronic products. The traditional lithium-ion battery cathode material is mainly lithium cobalt oxide LiCoO 2 However, due to high cost and poor safety, lithium cobalt oxide materials cannot meet the requirements of electric vehicles, energy storage and other fields. And layered nickel-cobalt-manganese ternary lithium-ion battery cathode material nickel-cobalt manganese lithium lithium (Ni x co y mn 1-x-y )O 2 Integrated LiCoO 2 , LiMn 2 o 4 、LiFePO 4 The advantages of materials such as...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G51/04C01G45/02C01G53/04H01M4/131H01M4/525H01M4/505H01M4/1391
CPCY02E60/122Y02E60/10
Inventor 鲁勇生谢松柳俊
Owner 协鑫动力新材料(盐城)有限公司
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