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Preparation method of Li4Ti5O12-TiO2 composite electrode material

A technology for composite electrodes and preparation steps, which is applied to battery electrodes, circuits, electrical components, etc., can solve problems such as environmental pollution and molten salt pollution to synthetic crystals, and achieve simple equipment and processes, excellent cycle stability, and simplified The effect of craft

Active Publication Date: 2012-03-21
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, during the preparation process of the molten salt method, the molten salt pollutes the synthetic crystal, and the volatile matter of the molten salt pollutes the environment.

Method used

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  • Preparation method of Li4Ti5O12-TiO2 composite electrode material
  • Preparation method of Li4Ti5O12-TiO2 composite electrode material
  • Preparation method of Li4Ti5O12-TiO2 composite electrode material

Examples

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Effect test

Embodiment 1

[0028] Weigh 2.383 g of analytically pure tetrabutyl titanate (purity ≥ 99.0%), mix with 50 ml of absolute ethanol, and form a clear solution under magnetic stirring; according to the atomic ratio Li / Ti = 1.4, weigh 1.000 g of analytically pure acetic acid Lithium (purity ≥ 99.0%) is added to the titanium-containing solution, and magnetic stirring is continued to form a clear solution containing lithium-titanium mixture; slowly add 2 ml of analytical pure ammonia water (content 25-28%), mix well, and form a milky white suspension liquid; transfer the suspension to a 100 ml Teflon-lined self-tightening autoclave, and place it in an oven at 180 o C was incubated for 24 hours; after cooling to room temperature, the product was washed with absolute ethanol, and filtered under vacuum at 80 o After vacuum drying in C oven, white amorphous Li 4 Ti 5 o 12 -TiO 2 Powder; under air atmosphere, with 5 o C / min rate of heating, the resulting powder at 600 o C for 2 hours, cooled to r...

Embodiment 2

[0032] Weigh 2.383 g of analytically pure tetrabutyl titanate (purity ≥ 99.0%), mix with 50 ml of absolute ethanol, and form a clear solution under magnetic stirring; according to the atomic ratio Li / Ti = 1.4, weigh 1.000 g of analytically pure acetic acid Add lithium (purity ≥ 99.0%) to the titanium-containing solution, continue magnetic stirring to form a clear solution containing lithium-titanium mixture; slowly add 1 ml analytical pure ammonia water (content 25~28%), mix well, and form a milky white suspension liquid; transfer the suspension to a 100 ml Teflon-lined self-tightening autoclave, and place it in an oven at 180 o C was incubated for 24 hours; after cooling to room temperature, the product was washed with absolute ethanol, and filtered under vacuum at 80 o After vacuum drying in C oven, white amorphous Li 4 Ti 5 o 12 -TiO 2 Powder; under air atmosphere, with 5 o C / min rate of heating, the resulting powder at 600 o C for 2 hours, cooled to room temperature ...

Embodiment 3

[0036] Weigh 2.383 g of analytically pure tetrabutyl titanate (purity ≥ 99.0%), mix with 50 ml of absolute ethanol, and form a clear solution under magnetic stirring; according to the atomic ratio Li / Ti = 1.2, weigh 0.857 g of analytically pure acetic acid Lithium (purity ≥ 99.0%) is added to the titanium-containing solution, and magnetic stirring is continued to form a clear solution containing lithium-titanium mixture; slowly add 2 ml of analytical pure ammonia water (content 25-28%), mix well, and form a milky white suspension liquid; transfer the suspension to a 100 ml Teflon-lined self-tightening autoclave, and place it in an oven at 180 o C was incubated for 24 hours; after cooling to room temperature, the product was washed with absolute ethanol, and filtered under vacuum at 80 o After vacuum drying in C oven, white amorphous Li 4 Ti 5 o 12 -TiO 2 Powder; under air atmosphere, with 5 o C / min rate of heating, the resulting powder at 600 o C for 2 hours, cooled to r...

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Abstract

The present invention belongs to the technical field of new energy and material, and particularly relates to a preparation method of a Li4Ti5O12-TiO2 composite electrode material. The utility model aims to settle a technical problem of providing a cathode material which has the following advantages: simple preparation method and capability of charging / discharging at a high magnification. Lithium acetate and tetrabutyl titanate are respectively used as a lithium source and a titanium source. Ammonia water is used as a pH value conditioning agent. Amorphous Li4Ti5O12-TiO2 precursor is prepared through the heat of solvent, and Li4Ti5O12-TiO2 composite powder with good crystal form is prepared after heat treatment. The sample which is synthesized according to the invention has the following advantages: small particle, uniform dispersion, regular shape, stable structure. good high-magnification charging / discharging characteristic, high cycling performance, and wide development prospect as cathode material of lithium ion battery. The preparation method of the Li4Ti5O12-TiO2 composite electrode material has the following main advantages: simple synthesis equipment and technique; easy control for phase composition, particle size and particle shape; flexible operation; reduced synthesis temperature; shortened heat treatment time; and reduced energy consumption.

Description

technical field [0001] The invention belongs to the technical field of new energy materials, and in particular relates to a lithium-ion battery composite negative electrode material Li 4 Ti 5 o 12 -TiO 2 The preparation method has broad application prospects in the fields of portable electronic equipment, power, energy storage equipment and the like. Background technique [0002] Lithium-ion batteries are known as the latest generation of "green secondary batteries in the 21st century". They have unique advantages such as high specific energy, high working voltage, and environmental friendliness. They are widely used in various portable batteries such as digital cameras, notebook computers, and mobile phones. Electronic equipment. In recent years, in order to fundamentally solve the exhaust pollution of automobiles, alleviate the energy crisis, and achieve low pollution and zero emissions, lithium-ion batteries have expanded to the field of environmentally friendly elect...

Claims

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Application Information

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IPC IPC(8): H01M4/48H01M4/485
CPCY02E60/122Y02E60/10
Inventor 赵海雷杨茜王捷王静王春梅
Owner UNIV OF SCI & TECH BEIJING
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