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Method for processing positive pole material of lithium cobalt acid in lithium ion battery

A technology for lithium-ion batteries and cathode materials, applied in battery electrodes, electrode manufacturing, circuits, etc., can solve problems such as poor high-temperature performance, capacity attenuation, and unstable cycle performance, so as to improve high-temperature performance, delay the rise of internal resistance, The effect of increasing gravimetric and volumetric energy density

Inactive Publication Date: 2005-11-16
GUANGZHOU INST OF GEOCHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a treatment method for lithium cobalt oxide, the positive electrode material of lithium ion batteries, so that after the positive electrode material is processed by this method, the cycle performance is not stable when it is used in lithium ion batteries , poor high temperature performance and rapid capacity decay after excessive delithiation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Dissolve ethyl orthosilicate in absolute ethanol, independently dissolve butyl orthotitanate in absolute ethanol, dissolve magnesium nitrate in ethanol, and then mix the above three solutions evenly.

[0024] Add lithium cobaltate to be treated into the mixer, and slowly add the above-mentioned treatment mixed solution under stirring, so that lithium cobaltate / n-butyl titanate / ethyl orthosilicate / magnesium nitrate / ethanol are mixed in a certain proportion. Stir at high speed and mix at high speed for 10 hours at a temperature of 50-60°C. The mixture was taken out and dried in an oven at 100° C. for 5 hours; then the dried positive electrode material was placed in a high-temperature oven and sintered at 800° C. for 12 hours. Filter with a 300-mesh stainless steel screen to obtain the processed positive electrode material.

[0025]The above-mentioned treated positive electrode materials were made into batteries, and other batteries were made in the same way. The differen...

Embodiment 2

[0029] Others are the same as Example 1, except that the ratio of lithium cobaltate / n-butyl titanate / ethyl orthosilicate / magnesium nitrate / ethanol is 100 / 0.2 / 0.05 / 0.1~1 / 30.

[0030] The above-mentioned treated positive electrode materials were made into batteries, and other batteries were made in the same way. The difference between the positive electrode materials used in these batteries and other batteries is that they have not undergone surface treatment. These batteries are marked as "C (for comparison batteries)" for performance evaluation The test is shown in Table-2.

[0031] make up

[0032] 3

[0033] C: represents lithium cobaltate, T: represents n-butyl titanate, S: represents tetraethyl orthosilicate, and M: represents magnesium nitrate.

Embodiment 3

[0035] Others are the same as Example 1, and the ratio of lithium cobaltate / n-butyl titanate / tetraethyl orthosilicate / magnesium nitrate / ethanol is 100 / 0 / 0.05 / 0.1~1 / 30.

[0036] The above-mentioned treated positive electrode materials were made into batteries, and other batteries were made in the same way. The difference between the positive electrode materials used in these batteries and other batteries is that they have not undergone surface treatment. These batteries are marked as "C (for comparison batteries)" for performance evaluation The test is shown in Table-3.

[0037] make up

[0038] C: represents lithium cobaltate, T: represents n-butyl titanate, S: represents tetraethyl orthosilicate, and M: represents magnesium nitrate. Example 4

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PUM

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Abstract

Usage ratio of cobalt ion in material of positive pole is only 50% currently. The treating method disclosed in the invention includes following steps: coating a layer of metallic oxide film on surface of LiCoO2 granules; carrying out drying and sintering treatment. Features of the product produced from the method are: improving high temperature property, cyclical stability, stability of anti overcharge; postponing ascend of internal resistance in charging procedure. The battery is posible to be charged at higher voltage. The method raises weight of material and volume energy density more than 20%.

Description

technical field [0001] The invention relates to a positive electrode material LiCoO used in a secondary lithium ion battery 2 surface modification method. Background technique [0002] Lithium-ion batteries contain an electrolyte, a negative electrode mainly composed of carbon, and a lithium-containing composite oxide such as LiCoO 2 , LiNiO 2 , LiMn 2 o 4 composed of positive electrodes. Based on the higher voltage and energy density of lithium-ion batteries than other aqueous electrolyte batteries, lithium-ion batteries have rapidly become the main energy source for mobile electrical equipment and related facilities. [0003] Due to the continuous improvement of the functions and performance of mobile appliances, the energy density of lithium-ion batteries has been continuously improved. However, the utilization rate of the positive and negative electrodes of the currently available lithium-ion batteries has roughly reached its limit of 100%. To further increase the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04
CPCY02E60/10
Inventor 陈鸣才王洪
Owner GUANGZHOU INST OF GEOCHEMISTRY - CHINESE ACAD OF SCI
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