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Method for preparing positive active material lithium cobaltate of lithium ion cell

A cathode active material, lithium-ion battery technology, applied in electrode manufacturing, battery electrodes, chemical instruments and methods, etc. Effects of chemical cycle performance, increased volumetric capacity, and reduced processing cost

Inactive Publication Date: 2005-01-26
QINGHAI TAIFENG XIANXING LITHIUM ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This will result in complicated procedures, reduced yield, increased processing cost, and increased waste water; at the same time, because lithium cobalt oxide needs to be soaked in deionized water for a long time, lithium cobalt oxide will be hydrolyzed and the discharge capacity will be reduced. , and further increase the alkalinity
On the other hand, reports such as M.Mladenov can improve its cycle performance [M.Mladenov, R.Stoyanova, E.Zhecheva, S.Vassilev, Electrochemistry Communication, 3(2001 )410], but the preparation of this surface-modified lithium cobaltate by surface impregnation requires secondary high-temperature treatment, which increases production costs, makes it difficult to guarantee batch consistency, and has low practical value.

Method used

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  • Method for preparing positive active material lithium cobaltate of lithium ion cell
  • Method for preparing positive active material lithium cobaltate of lithium ion cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Lithium carbonate and tricobalt tetroxide were mixed and ground in a ball mill for 3 hours according to the stoichiometric ratio Li: Co=1.02:1 (sample A) and Li: Co=1.08:1 (sample B), and then the homogeneously mixed materials were put into heating In the furnace, the heat treatment atmosphere is air, the temperature rise rate is 5°C / min to 700°C, after 2 hours of heat preservation, the temperature is raised to 800°C at 5°C / min, the heat treatment time is 5 hours, and then lowered to room temperature, and the synthetic material is crushed Sieve through a 300 mesh sieve.

[0024] Add sample A and sample B to the solution containing 5mmol / LMg at a solid-to-liquid ratio of 1:8, respectively. 2+ In the water of the precipitating agent (magnesium carbonate solution containing carbon dioxide), stir for 5 minutes, separate the solid and liquid after clarification, repeat the above washing operation until the pH of the supernatant is less than 8 (10% (W / V) LiCoO 2 pH value mea...

Embodiment 2

[0029] Lithium carbonate and cobalt carbonate were mixed in a ball mill for 3 hours according to the stoichiometric ratio Li:Co=1.02:1 (sample C) and Li:Co=1.08:1 (sample D), and then the uniformly mixed materials were put into In the heating furnace, the heat treatment atmosphere is oxygen, and the temperature rise rate is 5°C / min to 600°C. After 4 hours of heat preservation, the temperature is raised to 800°C at 5°C / min. The heat treatment time is 8 hours, and then lowered to room temperature, and the synthetic material After crushing, sieve through a 300-mesh sieve. Subsequent processing is the same as in Embodiment 1.

[0030] sample

[0031] Table 2. Comparison of several samples

Embodiment 3

[0033] According to the sample B obtained in Example 1, use Ca 2+ , Mg 2+ The concentration is 3mmol / L solution (calcium carbonate and magnesium carbonate solution containing carbon dioxide) treatment, solid-liquid ratio is 1:8. After washing twice, the pH of the upper layer solution is 7.8, and the pH value of lithium cobalt oxide after drying is 9.3; the discharge capacity of lithium cobalt oxide is 149mAh / g, and the tap density is 2.82g / cm 3 , specific surface area 0.37m 2 / g,D 50 is 11.5 μm.

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Abstract

The preparation method of lithium cobaltate as positive active material of lithium ion cell includes the following steps: uniformly mixing lithium and cobalt according to chemical metering ratio, stage heat treatment of raw material, pulverizing and sieving, washing lithium cobaltate with water containing precipitant, solid-liquid separation and drying solid phase so as to obtain the required sample. It the washing process of said invented method the surface of lithium cobaltate is covered with a layer of magnesium carbonate, calcium carbonate, strontium carbonate or their mixture, so that itcan quickly reduce alkaline of lithium cobaltate, regulate primary particle size of lithium cobalate, reduce specific surface area of lithium cobaltate powder, increase its specific volume and improve its working property, etc.

Description

Technical field: [0001] The invention relates to the preparation of a positive electrode active material of a lithium ion battery, in particular to a method for lithium cobalt oxide. Background technique: [0002] Lithium cobalt oxide (LiCoO 2 ) as the positive electrode material of lithium ion battery, because of its high specific capacity, stable performance and simple preparation process, it has been widely used as the positive electrode active material of lithium ion battery. In the synthesis of LiCoO 2 In the process, in order to make the solid phase reaction go smoothly and compensate for the volatilization loss of a part of lithium salt at high temperature, lithium carbonate (Li 2 CO 3 ), which can improve the tap density and fluidity of lithium cobalt oxide, form larger primary particles, increase the volume specific capacity in the actual battery, and increase the overcharge safety performance of the battery. In general, Li added in excess 2 CO 3 Only a small ...

Claims

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Application Information

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IPC IPC(8): C01G51/00H01M4/525
CPCY02E60/10
Inventor 周恒辉杨正任献举
Owner QINGHAI TAIFENG XIANXING LITHIUM ENERGY TECH CO LTD
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