Preparation method of lithium-titanate-cladding sulfur composite lithium-ion battery positive material

A lithium titanate-coated, lithium-ion battery technology, applied in battery electrodes, electrolyte storage battery manufacturing, non-aqueous electrolyte storage batteries, etc., can solve the problems of unfavorable high-rate performance of batteries, poor mechanical stability of electrodes, and large volume changes , to achieve good chemical stability and thermal stability, stable charge and discharge voltage platform, and easy preparation

Inactive Publication Date: 2013-09-11
ZHEJIANG UNIV
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

There are three main problems in lithium-sulfur batteries: (1) Li-polysulfur compounds dissolve in the electrolyte; (2) Sulfur, as a non-conductive substance, has very poor conductivity, which is not conducive to the high rate performance of the battery; (3) Sulfur in During the charge and discharge process, the volume change is very large, resulting in poor mechanical stability of the electrode
Lithium-ion batteries with lithium titanate as the positive electrode have the characteristics of high safety, high stability, long life and environmental protection, but the specific capacity is small

Method used

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  • Preparation method of lithium-titanate-cladding sulfur composite lithium-ion battery positive material

Examples

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Effect test

Embodiment 1

[0024] Example 1: Preparation of erythrocyte-like lithium titanate material

[0025] (1) Add 30 g of acetic acid and 50 g of tetrabutyl titanate in sequence to 300 ml of ethanol, and disperse with ultrasonic waves for 40 minutes to form A solution;

[0026] (2) Add 50 grams of acetic acid to 60 milliliters of ethanol, then add 30 milliliters of deionized water and 7.76 grams of lithium acetate to form B solution;

[0027] (3) After magnetically stirring solution A at a constant temperature of 30°C for 30 minutes, add solution B to solution A dropwise to obtain a sol;

[0028] (4) Add 1 gram of acetic acid to the sol obtained in step (3) to control the pH value at 1±0.1, and keep stirring for 1 hour to obtain the precursor sol;

[0029] (5) Import the precursor sol obtained in step (4) into a spray dryer, spray it into hot air, and form a precursor of erythrocyte-like lithium titanate material while removing most of the water;

[0030](6) Place the erythrocyte-like lithium ti...

Embodiment 2

[0031] Example 2: Preparation of lithium titanate-sulfur composite material

[0032] (1) Add 30 grams of citric acid and 50 grams of tetrabutyl titanate in sequence to 300 ml of ethanol, and disperse by ultrasonic for 40 minutes to form A solution;

[0033] (2) Add 50 grams of citric acid to 60 milliliters of ethanol, then add 30 milliliters of deionized water and 7.76 grams of lithium acetate to form B solution.

[0034] (3) After magnetically stirring solution A at a constant temperature of 30°C for 30 minutes, add solution B to solution A dropwise to obtain a sol;

[0035] (4) Add 10 grams of citric acid to the sol obtained in step (3) to make the pH of the sol 1±0.1, and keep stirring for 1 hour to obtain the precursor sol.

[0036] (5) The above-mentioned sol is introduced into a spray dryer, and the sol is dispersed into very fine mist-like particles by mechanical action. After contacting with hot air, most of the water is removed instantly to form a erythrocyte-like li...

Embodiment 3

[0039] Example 3: Lithium-sulfur battery with lithium titanate material as negative electrode material and lithium titanate-coated sulfur composite material as positive electrode material

[0040] The erythrocyte-like lithium titanate, acetylene black, and polyvinylidene fluoride (PVDF) in Example 1 were ground in a mass ratio of 80:10:10, and after grinding, the solvent N-methylpyrrolidone was added to adjust to a certain viscosity, and mechanically mixed for 30 Minutes, made into a paste, applied to the copper film, and dried in the shade; at 100 Kg cm -2 Press molding under a certain pressure to obtain the negative electrode of the lithium ion battery. (The manufacturing method of the negative electrode is different from that of the positive electrode)

[0041] The lithium titanate-coated sulfur composite material, acetylene black, and PVDF in Example 2 were ground in a mass ratio of 80:10:10, and N-methylpyrrolidone was added after each grinding to adjust to a certain vis...

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Abstract

The invention relates to the preparation technology of a lithium-ion battery, and aims at providing a preparation method of a lithium-titanate-cladding sulfur composite lithium-ion battery positive material. The preparation method comprises the following steps of: adding organic acid and tetrabutyl titanate into ethyl alcohol to be ultrasonically dispersed to obtain a solution A; adding the organic acid into the ethyl alcohol, and adding deionized water lithium acetate to obtain a solution B; dropping the solution B into the solution A to obtain sol; adding organic acid into the sol to obtain a precursor sol; spraying the precursor sol into the air to form erythrocyte-shaped lithium titanate material precursor; placing the lithium titanate material precursor into a muffle furnace to be insulated after reaching a set temperature, thus obtaining the erythrocyte-shaped lithium titanate material; grinding and mixing single sulfur with the erythrocyte-shaped lithium titanate material, placing the mixture into a reactor to be heated in vacuum to complete a sulfur storage process, and cooling a product to the room temperature to obtain the lithium-titanate-cladding sulfur composite material. By adopting the method, the organic electrolyte is safe to use in the battery; good electrode reaction reversibility can be realized; good chemical stability and heat stability can be realized; the material is cheap and easy to prepare; no pollution exists.

Description

technical field [0001] The invention relates to a lithium ion battery material and a preparation method thereof, in particular to a preparation method of an electrode material coated with sulfur by erythrocyte-like lithium titanate, and a lithium ion battery prepared by using the electrode material. Background technique [0002] Lithium-ion batteries have the advantages of light weight, large capacity, and no memory effect, so they have been widely used. Many digital devices now use lithium-ion batteries as power sources. The energy density of lithium-ion batteries is very high, its capacity is 1.5 to 2 times that of nickel-metal hydride batteries of the same weight, and its advantages such as low self-discharge rate and no toxic substances are important reasons for its wide application. Lithium-sulfur batteries are a type of lithium-ion batteries. A lithium-sulfur battery is a lithium-ion battery in which sulfur is used as the positive electrode of the battery. Specific ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/139H01M4/38H01M10/058
CPCY02E60/10Y02P70/50
Inventor 李洲鹏葛余俊刘宾虹
Owner ZHEJIANG UNIV
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