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Method for preparing lithium cobalt oxide anode of silicon-based film lithium ion battery by using wet chemical-surface deposition method

A battery lithium cobalt oxide and silicon-based thin film technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of high production cost, complicated coating process, unsuitable for commercial promotion, etc., and achieve high rate charge and discharge performance and thermal stability improvement, the application possibility is remarkable effect

Inactive Publication Date: 2014-04-16
FUJIAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Stability51211if Alloys and Compoundsoating ZrO2 on LiCoO2 and thermal stability of LiCoO2 as cathode materials for lithium-ion batter Although the charge-discharge cycle performance of the battery can be significantly improved by coating the oxide material on the surface of lithium-cobaltate particles, the coating process is often relatively Complicated, the production cost is usually relatively high, not suitable for commercial promotion

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Dissolve 3.06 grams of lithium acetate in 50 milliliters of distilled water and keep stirring to obtain a clear solution A; dissolve 7.47 grams of cobalt acetate in 50 milliliters of distilled water and keep stirring to obtain a clear solution B; dissolve 12.61 grams of citric acid in 100 milliliters of distilled water And continue to stir to obtain a clear C solution; use a dropper to successively drop the A solution and the B solution dropwise and slowly into the stirred C solution, the dropping speed is 30 drops per minute, and the stirring speed of the C solution is 80 revolutions per minute. And 20 ml of ethylene glycol was added dropwise to obtain a mixed D solution. Place D solution in a water bath at 70°C and stir at a stirring speed of 70 rpm until a gel is formed; dry the gel in a drying oven at 100°C to obtain a xerogel. Grind the dry gel in an agate mortar for 30 minutes, place it in a muffle furnace, and sinter it in an air atmosphere. The time is 24 hours...

Embodiment 2

[0030]Dissolve 5.10 grams of lithium acetate in 45 milliliters of distilled water and stir to obtain solution A; dissolve 14.51 grams of cobalt nitrate in 45 milliliters of distilled water and stir to obtain solution B; dissolve 21.014 grams of citric acid in 100 milliliters of distilled water and stir to obtain solution C Solution; slowly pour A solution and B solution into the stirred C solution, the stirring speed of C solution is 70 revolutions per minute, and drop 30 milliliters of ethylene glycol to obtain a mixed D solution. Place D solution in a water bath at 70°C and stir at a stirring speed of 60 rpm until a gel is formed; dry the gel in a drying oven at 110°C to obtain a xerogel. Grind the dry gel in an agate mortar for 1 hour, place it in a muffle furnace, and sinter it in an air atmosphere. The time is 24 hours. After the sintering is completed, the temperature is lowered to room temperature with the furnace, and the lithium cobaltate powder LiCoO is obtained. 2 ...

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PUM

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Abstract

The invention relates to a method for preparing a lithium cobalt oxide anode of a silicon-based film lithium ion battery by using a wet chemical-surface deposition method. The method comprises the following steps of: dissolving a lithium precursor and a cobalt precursor in distilled water to obtain a solution A and a solution B; dissolving citric acid of which the mole number is equal to the total mole number of lithium and cobalt in distilled water to obtain a solution C; dripping the solution A and the solution B into the solution C and dripping ethylene glycol to obtain a mixed solution D; stirring the solution D in a water bath to form gel and drying to obtain xerogel; grinding the xerogel and sintering to obtain lithium cobalt oxide; weighing polyvinylidene fluoride, dissolving into an N-methyl ketopyrrolidine solution, adding graphitized carbon black, stirring, then adding the lithium cobalt oxide and coating a sizing agent onto an aluminum foil to obtain a lithium cobalt oxide positive plate; and arranging the lithium cobalt oxide positive plate right above or around a silicon-based source in a deposit cavity. Due to the adoption of the method disclosed by the invention, the charging and discharging performance of the battery is remarkably enhanced, and the improving effect is not influenced by a specific preparing process of the lithium cobalt oxide; and the method has very remarkable applicability.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery electrode materials, and relates to a method for depositing a silicon-based film on the surface of a lithium cobaltate positive electrode by a wet chemical-surface deposition method to improve the high-rate charge and discharge performance of the battery, especially for improving cobalt acid Lithium charge and discharge performance. technical background [0002] Lithium-ion secondary batteries have the advantages of high working voltage, high energy density, good electrochemical cycle performance, and long life, and are widely used in digital equipment, portable appliances, military equipment power supplies, electric vehicles and other fields. [0003] Layered lithium cobalt oxide cathode material has the advantages of high specific capacity, simple preparation process, good cycle performance and long service life. Since the commercialization of lithium-ion batteries, it has been the l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/1391
CPCY02E60/122Y02E60/10
Inventor 赵桂英周婷林莹曾宝枝戴颖林应斌黄志高
Owner FUJIAN NORMAL UNIV