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Preparation method of spherical Li4Ti5O12 as lithium ion cell cathode material

A technology for lithium ion batteries and negative electrode materials, applied in electrode manufacturing, battery electrodes, secondary batteries, etc., can solve the problems of low density, poor conductivity, voltage hysteresis, etc., and achieve simple process flow, high packing density, and improved conductivity. Effect

Inactive Publication Date: 2005-06-01
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the anode materials of lithium-ion batteries mostly use various lithium-intercalated carbon materials, but carbon materials still have some disadvantages as anode materials for lithium-ion batteries: low initial charge and discharge efficiency; interaction with electrolyte; obvious voltage hysteresis; The preparation method of the material is more complex
However, judging from the current research results, the problems of poor conductivity and low density have not been well solved.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Weigh 10gTiCl 4 Put it into a beaker, add about 20ml of deionized water, and hydrolyze about 2.9mol / L of TiO 2 ·nH 2 O Sol A. Then weigh 4.5 g each of hexamethylenetetramine (urotropine) and urea and put them into another beaker, and add about 20 ml of solution B dissolved in deionized water. Add solution B dropwise to sol A at a temperature of 10°C with stirring to prepare a new sol. Take kerosene as the medium, and then add 1% Span 80 as a surfactant, slowly add the newly prepared sol into the medium under stirring conditions, raise the temperature to 70°C after the addition is completed, and stop heating after 10 minutes of heat preservation and stirring to precipitate the gel. Centrifuge to obtain dry gel, wash once with 0.7% soil temperature 80 aqueous solution at 70°C, then wash twice with deionized water at room temperature, then age with 5% ammonia water for 24 hours, and centrifuge After drying, the spherical precursor is obtained. Weigh Li according to t...

Embodiment 2

[0034] Weigh 15gTiCl 4 Put it into a beaker, add about 20ml of deionized water, and hydrolyze about 4.5mol / L of TiO 2 ·nH 2 O Sol A. Then weigh 4.5 g of hexamethylenetetramine (urotropine) and 9 g of urea respectively, put them into another beaker, and add about 20 ml of solution B dissolved in deionized water. Add solution B dropwise to sol A at a temperature of 5°C under stirring conditions to prepare a new sol. Take kerosene as the medium, and then add 0.5% Span 80 as a surfactant, slowly add the newly prepared sol into the medium under stirring conditions, raise the temperature to 75°C after the addition is completed, and stop heating after 10 minutes of heat preservation and stirring to precipitate the gel. Centrifuge to obtain dry gel, wash once with 0.5% soil temperature 80 aqueous solution at 65°C, then wash twice with deionized water at room temperature, then age with 1% ammonia water for 24 hours, and centrifuge After drying, the spherical precursor is obtained....

Embodiment 3

[0036] Weigh 15gTiCl 4 Put it into a beaker, add about 20ml of deionized water, and hydrolyze about 5mol / L of TiO 2 ·nH 2 O Sol A. Then weigh 4.5 g of hexamethylenetetramine (urotropine) and 22.5 g of urea respectively, put them into another beaker, and add about 40 ml of solution B dissolved in deionized water. Add solution B dropwise to sol A at a temperature of 10°C with stirring to prepare a new sol. Take kerosene as the medium, and then add 5% Span 80 as a surfactant, slowly add the newly prepared sol into the medium under stirring conditions, raise the temperature to 80°C after the addition is completed, and stop heating after 20 minutes of heat preservation and stirring to precipitate the gel. Centrifuge to obtain dry gel, wash once with 0.5% soil temperature 80 aqueous solution at 69 ° C, then wash twice with deionized water at room temperature, then age with 10% ammonia water for 48 hours, and centrifuge After drying, the spherical precursor is obtained. Weigh L...

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Abstract

The technological process of preparing spherical Li4Ti5O12 as negative material for lithium ion cell includes: hydrolyzing TiCl4 to form sol A; dissolving hexamethine tetramine and urean in water to prepare solution B; adding solution B into sol A to prepare mixed sol; dropping the mixed sol into kerosene medium and heating to convert the sol into deposited gel; separating, washing, ageing and drying to obtain spherical precursor; adding lithium and performing heat treatment to prepare spherical Li4Ti5O12. When doping, the dopant ion is added into sol A. The technological process is simple and easy to dope carbon to raise the conductivity of the product, and has high application value, and the prepared Li4Ti5O12 is spherical and high in bulk density.

Description

technical field [0001] The present invention relates to a kind of preparation lithium ion battery anode material spherical Li 4 Ti 5 o 12 The process belongs to the field of chemical engineering and new materials. Background technique [0002] At present, the anode materials of lithium-ion batteries mostly use various lithium-intercalated carbon materials, but carbon materials still have some disadvantages as anode materials for lithium-ion batteries: low initial charge and discharge efficiency; interaction with electrolyte; obvious voltage hysteresis; The preparation method of the material is more complicated. Compared with the carbon negative electrode in lithium-ion batteries, although alloy negative electrode materials generally have a higher specific capacity, repeated intercalation and deintercalation of lithium lead to large volume changes of alloy electrodes during charging and discharging, and gradually pulverize and fail. Thus, the cycle performance is poor. T...

Claims

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Application Information

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IPC IPC(8): C01D15/00C01G1/02C01G23/00H01M4/02H01M4/04H01M4/48H01M4/58H01M10/36
CPCC01G23/005H01M4/131H01M4/136H01M4/485H01M4/5825H01M10/0525Y02E60/10
Inventor 高剑姜长印应皆荣万春荣何向明李建军王莉
Owner TSINGHUA UNIV
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