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Method for preparing anode material for lithium ion batteries

A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, electrode manufacturing, circuits, etc., can solve problems such as uneven doping of sulfur elements, achieve uniform doping, superior overall performance, and increase battery specific capacity and cycle times Effect

Inactive Publication Date: 2013-06-19
马鞍山活力电动科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is: in the prior art, the sulfur element is not uniformly doped in the positive electrode material, thereby providing a preparation method with uniform doping and good performance of the positive electrode material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0008] A method for preparing a positive electrode material of a lithium ion battery, comprising: ball milling a positive electrode material precursor under a sulfur dioxide atmosphere; and then calcining at a high temperature under an oxygen atmosphere.

[0009] Among them, the cathode material is nickel-manganese-cobalt series cathode materials, such as unary compounds (lithium cobalt oxide, lithium nickel oxide, lithium manganese oxide), binary compounds (lithium nickel manganese oxide, lithium cobalt manganese oxide, lithium cobalt nickel oxide), three Elementary compound (lithium nickel manganese cobalt oxygen) and its doped derivatives.

[0010] The precursor of the positive electrode material is well known to those skilled in the art, and its precursor is its corresponding hydroxide. such as LiCoO 2 The precursor is LiCo(OH) 3 , LiNi 0.8 co 0.2 o 2 The precursor is LiNi 0.8 co 0.2 (OH) 3 .

[0011] Add the positive electrode material precursor into the ball mil...

Embodiment 1

[0034] The cathode material precursor LiNi 0.8 co 0.2 (OH) 3 8kg is put into the ball mill jar of roller ball mill, puts into grinding ball (the grinding ball is the big grinding ball that 1.6Kg diameter is 2cm, and 4Kg diameter is the middle grinding ball of 1cm, and 3.2Kg diameter is the small grinding ball of 0.3cm), pass Inject nitrogen to get rid of the air in the ball mill tank, then feed 0.1mol of sulfur dioxide, and ball mill. The rotational speed of the ball mill is controlled to 30r / s, and the time is 2.5h.

[0035] Take out the material and put it into a high-temperature calciner, at an oxygen flow rate of 2m 3 Calcined at 500°C for 10h at 500°C / h, and then calcined at 750°C for 20h.

[0036] A positive electrode material A1 was produced.

Embodiment 2

[0038] The difference from Example 1 is that 0.2mol of sulfur dioxide is introduced, and other steps are the same as in Example 1. A positive electrode material A2 was produced.

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Abstract

The invention belongs to the field of lithium ion batteries and discloses a method for preparing an anode material. The method comprises: ball-milling the precursor of the anode material in an atmosphere of sulfur dioxide; and sintering at high temperature in atmosphere of oxygen. In the method for preparing the anode material, the doping of the sulfur element is more uniform, the overall performance of the material is higher, and particularly the specific capacity and cycle index of the batteries are improved considerably. The method also has the characteristics of safety, reliability and nohidden danger.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a method for preparing a positive electrode material of a lithium ion battery. Background technique [0002] It has been pointed out in the literature that sulfur can significantly improve the charge-discharge performance of lithium-ion battery cathode materials. At present, the methods of sintering after mechanical mixing are commonly used, such as stirring mixing method, juice extractor mixing method, etc. [0003] The stirring and mixing method is to use a magnetic stirrer or mechanical stirring to mix the precursor of the positive electrode material with sulfate or sulfide. This method is purely mechanical mixing, and no chemical reaction occurs. Only in the subsequent calcination can the chemical reaction produce sulfur mixed in. Because this method cannot uniformly mix the sulfur element into the positive electrode material during calcination, the phenomenon that the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/04H01M4/36
CPCY02E60/12Y02E60/10
Inventor 李阳先雪峰
Owner 马鞍山活力电动科技有限公司