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Method for preparing lithium battery negative electrode material lithium titanate by taking titanium tetrachloride as raw material

A technology of titanium tetrachloride and negative electrode materials, applied in the direction of chemical instruments and methods, negative electrodes, titanate, etc., can solve problems such as volume expansion, battery capacity reduction, battery short circuit, etc., to improve mixing uniformity and reduce grinding time, performance-improving effects

Active Publication Date: 2021-01-05
PANGANG GROUP RESEARCH INSTITUTE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The key to lithium-ion battery research is the selection of electrode materials. As a negative electrode material for lithium-ion batteries, carbon materials are the most widely used negative electrode materials in commercial lithium-ion batteries due to their abundant reserves and high cost performance. Serious disadvantages: First, during the charging and discharging process, lithium ion deintercalation will cause volume expansion and contraction of the carbon electrode material, and long-term use may cause the crystal structure of the electrode material to collapse, thereby causing a decrease in battery capacity; second, the carbon electrode In the process of lithium intercalation and deintercalation, the potential is close to metal lithium. When the battery is overcharged, lithium dendrites are easily formed on the surface, causing an internal short circuit in the battery, thus posing a potential safety hazard.
The above method has defects such as low gram capacity and high cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Use a graduated cylinder to measure 200mL of deionized water into a 500mL beaker, place the beaker in an ice-water bath, stir with an electric stirrer at a speed of 300 rpm, transfer 20mL of titanium tetrachloride to an ice-water bath with a graduated cylinder In a beaker, adjust the pH value of the titanium tetrachloride solution to 8.0 using an ammonia solution with a mass fraction of 25%, and control the temperature of the solution to 70° C., stir for 1 h, pour off the supernatant, wash the precipitate with deionized water three times, and then in Dry at 100°C for 6 hours in a blast drying oven, and then grind with an agate mortar to obtain powdered titanium dioxide.

[0029] Get 20g powdery titanium dioxide and join in 80mL deionized water to form a suspension, the solid content of titanium dioxide in the suspension is 20%, granulate with a spray dryer, and the spray dryer is fed with a peristaltic pump, and the feed rate is 400mL / min, the inlet temperature is 150°...

Embodiment 2

[0032] Use a graduated cylinder to measure 200mL of deionized water into a 500mL beaker, place the beaker in an ice-water bath, stir with an electric stirrer at a speed of 300 rpm, transfer 20mL of titanium tetrachloride to an ice-water bath with a graduated cylinder In a beaker, adjust the pH value of the titanium tetrachloride solution to 8.0 by using an ammonia solution with a mass fraction of 25%, and control the temperature of the solution at 80° C., stir for 1.5 h, pour off the supernatant, wash the precipitate three times with deionized water, and then Dry it at 100°C for 6 hours in a blast drying oven, and then grind it with an agate mortar to obtain powdered titanium dioxide.

[0033] Get 20g powdery titanium dioxide and join in 80mL deionized water to form a suspension, the solid content of titanium dioxide in the suspension is 20%, granulate with a spray dryer, and the spray dryer is fed with a peristaltic pump, and the feed rate is 400mL / min, the inlet temperature...

Embodiment 3

[0036] Use a graduated cylinder to measure 200mL of deionized water into a 500mL beaker, place the beaker in an ice-water bath, stir with an electric stirrer at a speed of 300 rpm, transfer 20mL of titanium tetrachloride to an ice-water bath with a graduated cylinder In a beaker, adjust the pH value of the titanium tetrachloride solution to 9.0 with an ammonia solution with a mass fraction of 25%, control the temperature of the solution at 75°C, stir for 1h, pour off the supernatant, wash the precipitate with deionized water for three times, and then in Dry at 100°C for 6 hours in a blast drying oven, and then grind with an agate mortar to obtain powdered titanium dioxide.

[0037]Get 30g powdery titanium dioxide and join in 70ml deionized water to form a suspension, the solid content of titanium dioxide in the suspension is 30%, granulate with a spray dryer, and the spray dryer feeds with a peristaltic pump, and the feed rate is 400mL / min, the inlet temperature is 150°C, and...

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PUM

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Abstract

The invention belongs to the technical field of inorganic chemical engineering, and particularly relates to a method for preparing a lithium battery negative electrode material lithium titanate by taking titanium tetrachloride as a raw material. The technical problem to be solved by the invention is to provide the preparation method of the lithium battery negative electrode material lithium titanate, which is low in cost and simple and convenient in steps. The method comprises the following steps: a, preparing a titanium tetrachloride solution under an ice-water bath condition, hydrolyzing thetitanium tetrachloride solution, carrying out solid-liquid separation after the hydrolysis is completed to obtain a precipitation product, washing, drying and grinding to obtain powdery titanium dioxide; b, adding powdery titanium dioxide into water to prepare turbid liquid, and granulating by adopting a spray dryer while stirring to obtain spherical titanium dioxide; and c, mixing the sphericaltitanium dioxide with lithium carbonate, grinding and roasting to obtain lithium titanate. By adopting the method disclosed by the invention, the mixing uniformity of titanium dioxide and lithium carbonate can be improved, the purity of the prepared lithium titanate is 99.0-99.5%, and the performance of the lithium titanate is obviously improved.

Description

technical field [0001] The invention belongs to the technical field of inorganic chemical industry, and in particular relates to a method for preparing lithium titanate, a lithium battery negative electrode material, by using titanium tetrachloride as a raw material. Background technique [0002] Lithium-ion batteries are widely used in mobile electronic devices, have good application prospects in electric vehicles and various energy storage systems, and are one of the most promising energy storage batteries in the future. The key to lithium-ion battery research is the selection of electrode materials. As a negative electrode material for lithium-ion batteries, carbon materials are the most widely used negative electrode materials in commercial lithium-ion batteries due to their abundant reserves and high cost performance. Serious disadvantages: First, during the charging and discharging process, lithium ion deintercalation will cause volume expansion and contraction of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/00H01M4/485H01M10/0525
CPCC01G23/005H01M4/485H01M10/0525H01M2004/027C01P2006/80Y02E60/10
Inventor 孟伟巍王仕伟
Owner PANGANG GROUP RESEARCH INSTITUTE CO LTD