Activating method of cathode material

A technology of positive electrode material and activation method, which is applied in the direction of battery electrodes, structural parts, electrical components, etc., can solve problems such as the introduction of impurities and damage to positive electrode materials, and achieve the effect of avoiding rapid capacity decay

Inactive Publication Date: 2011-08-31
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is: in the prior art, acid activates the positive electrode material, which will cause damage to the positive electrode material and the introduction of impurities.

Method used

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  • Activating method of cathode material
  • Activating method of cathode material
  • Activating method of cathode material

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Activation solution configuration: NO 2 BF 4 (US IL) was dissolved in acetonitrile (analytical grade) to make a concentration of 0.2mol / L activation solution.

[0032] Cathode material: 0.4Li 2 MnO 3 0.4LiNi 0.5 mn 0.5 o 2 Composite solid solution with an average particle size of 1 μm.

[0033]In an environment with a water content of 1ppm (mass fraction) and an oxygen content of 1ppm (mass fraction), 8.6g of positive electrode material was added to 100mL of activation solution and soaked for 48h, and the stirring rate was controlled at 100rad / s during the soaking process. It was then suction filtered and washed three times with acetonitrile. Finally, the obtained solid was dried at 80° C. for 24 h.

[0034] The obtained positive electrode material is denoted as A1.

Embodiment 2

[0036] The difference from Example 1 is that with NO 2 PF 6 instead of NO 2 BF 4 . Other parts are with embodiment 1.

[0037] The obtained positive electrode material is denoted as A2.

Embodiment 3

[0039] The difference from Example 1 is that the soaking time is 72h. Other parts are with embodiment 1.

[0040] The obtained positive electrode material is denoted as A3.

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Abstract

The invention belongs to the technical field of lithium ion cells, and in particular discloses an activating method of a cathode material, which comprises the step of: under a water and oxygen-free environment, soaking the cathode material in an activating solution to activate the cathode material, wherein the general formula of the cathode material is xLi2MnO3.yLiMO3, x is more than 0 or less than 1, y is equal to 1-x, M is a metal element, both Li2MnO3 and LiMO3 have a laminated structure, the activating solution is an organic solution of an activating agent, and the activating agent is NO2BF4 or NO2PF4. The method provided by the invention can not cause loss of the Mn element in the cathode material and introduction of impurities in the generated cathode material. Meanwhile, because the activation is not acid activation, a cubic structure for damaging an oxygen layer is avoided being brought by the acid activation, problems of high capacity attenuation and reduced cycle performance of the cathode material prepared in the invention are avoided.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to an activation method for positive electrode materials. Background technique [0002] Lithium-ion batteries are more and more widely used in portable electronic products such as mobile phones and digital cameras due to their advantages of high energy and no pollution. They are also used as backup energy for large-scale equipment such as automobiles and space stations. , the requirements for its various performances are also constantly increasing. [0003] The widely used cathode active material is generally LiCoO 2 Such as Co-based active materials, but Co is toxic and causes some pollution to the environment. At the same time, with the consumption of resources, the price is becoming more and more expensive, and LiCoO 2 When Li ions are extracted, the structure is Li 1-x CoO 2 , when x>0.5, its structure will undergo irreversible changes, and the c...

Claims

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Application Information

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IPC IPC(8): H01M4/1391H01M4/505H01M4/525
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 郭姿珠李昕洋胡刚
Owner BYD CO LTD
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