Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

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
View PDF2 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation method of lithium-titanate-cladding sulfur composite lithium-ion battery positive material

Examples

Experimental program
Comparison scheme
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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com