Positive pole material of lithium ion battery and preparation method of positive pole material

A technology for lithium-ion batteries and positive electrode materials, which is applied in the field of lithium-ion battery positive electrode materials and its preparation, and can solve the problems of not being able to well suppress the pulverization of secondary particles

Active Publication Date: 2013-12-11
NINGDE AMPEREX TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the acetylene black or fiber carbon coated on the surface of the primary particles is only filled between the primary particles. Since the force between the acetylene black or the fiber carbon and the primary particles is small, it cannot suppress the dusting of the secondary particles well. It can only reduce the contact internal resistance after the secondary particle pulverization

Method used

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  • Positive pole material of lithium ion battery and preparation method of positive pole material
  • Positive pole material of lithium ion battery and preparation method of positive pole material
  • Positive pole material of lithium ion battery and preparation method of positive pole material

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preparation example Construction

[0043] refer to figure 1 , in the first mode, the preparation method of the positive electrode material of lithium ion battery according to the second aspect of the present invention is used to prepare the positive electrode material of lithium ion battery according to the first aspect of the present invention, which includes the steps of: providing lithium-containing multiple transition Group metal oxide primary particle PP; the primary particle PP is dispersed in the dispersion liquid, and then the second phase material or the precursor of the second phase material is added in the dispersion liquid, so that the second phase material or the second The phase substance precursor is distributed on the surface of the primary particle PP, and then the precursor of the secondary particle is synthesized by granulation; the precursor of the secondary particle is sintered, and the secondary particle SP of the positive electrode material of the lithium ion battery is obtained after sint...

Embodiment 1

[0058] Example 1 The prepared lithium-containing multi-element transition metal oxide is Li 0.98 Ni 1 / 3 co 1 / 3 mn 1 / 3 o 2 , the second phase substance is TiO 2 .

[0059] Step a: first synthesize Li by gel-sol method 0.98 Ni 1 / 3 co 1 / 3 mn 1 / 3 o 2 Primary particles: Lithium acetate, nickel acetate, cobalt acetate, and manganese acetate are dissolved in deionized water according to the atomic ratio Li:Ni:Co:Mn=1.03:0.33:0.33:0.33, and the total concentration is 1mol / L. solution, then add citric acid, the concentration of citric acid in the mixed solution is 1mol / L, put the above solution in a water bath at 85°C, evaporate the water, and form a gel-like substance, and then transfer it to an oven at 160°C for 5 Hours, a brownish-black substance is formed, ground into powder, and sintered at 650°C for 2 hours in an air atmosphere to form particles with an average particle size of 300nm.

[0060] Step b: Disperse the primary particles obtained after the above-mentioned si...

Embodiment 2

[0063] Example 2 The prepared lithium-containing multi-element transition metal oxide is Li 0.98 Ni 1 / 3 co 1 / 3 mn 1 / 3 o 2 , the second phase material is MgO.

[0064] Step a: first synthesize evacuated secondary particles by co-precipitation method: NiSO 4 、CoSO 4 , MnSO 4 Dissolve in deionized water according to the atomic ratio Ni:Co:Mn=0.33:0.33:0.33, configure a mixed solution with a total concentration of 1mol / L, and then add the prepared 1mol / L NaOH solution to the above solution, While adding and stirring, the temperature is controlled at 75°C. After sufficient reaction, disperse secondary particles with a dispersive structure are formed, that is, the disperse secondary particles are composed of Li particles with an average particle size of 600nm. 0.98 Ni 1 / 3 co 1 / 3 mn 1 / 3 o 2 The formation of irregular primary particle aggregation of hydroxide precursors, Li 0.98 Ni 1 / 3 co 1 / 3 mn 1 / 3 o 2 There are large gaps between the primary particles of the hydroxid...

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Abstract

The invention provides a positive pole material of a lithium ion battery and a preparation method of the positive pole material. Secondary particles of the positive pole material of the lithium ion battery comprise primary particles of lithium-containing multi-transition metal oxide and second-phase materials; in a process of forming the secondary particles through the primary particles, the second-phase materials form second-phase material layers which are distributed on the surfaces of the primary particles, and are diffused with the lithium-containing multi-transition metal oxide through atoms to form diffusion layers so as to enable the second-phase material layers to be combined with the primary particles. Therefore, pulverization of the secondary particles of the positive pole material of the lithium ion battery along interfaces between the primary particles can be effectively suppressed, and the sizes of the primary particles and the secondary particles can be effectively controlled. When the positive pole material is applied to the lithium ion battery, the lithium ion battery is high in specific capacity, good in cycle performance and good in safety performance.

Description

technical field [0001] The invention relates to the field of lithium ion battery material preparation, in particular to a lithium ion battery positive electrode material and a preparation method thereof. Background technique [0002] Among the layered lithium-containing transition metal oxide materials, lithium cobaltate materials are mostly composed of primary particles; while for lithium-containing multi-element transition metal oxide materials, the corresponding hydroxide material or carbonate precursor, and then mixed with easily decomposed lithium salt, and then sintered at high temperature. Therefore, the lithium-containing multi-element transition metal oxide materials synthesized by this method generally grow from small primary particles aggregated into Larger secondary particles, so such secondary particles are easy to pulverize along the interface between primary particles after high-pressure compaction and long-term electrochemical cycles, making the electrical co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48H01M4/62
CPCC01G53/50C01P2002/50C01P2004/61C01P2004/62C01P2004/64C01P2006/40H01M4/366H01M4/505H01M4/525H01M4/62H01M2004/028Y02E60/10
Inventor 房向鹏种晋邝泉柳娜
Owner NINGDE AMPEREX TECH
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