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Method for preparing nano-TiO2 serving as cathode material of lithium ion battery

A technology for lithium ion batteries and negative electrode materials, applied in the directions of titanium oxide/hydroxide, titanium dioxide, etc., can solve the problems of unsuitability for large-scale production, long reaction time, high raw material cost, and achieve convenient industrial production, short reaction period, Equipment simple effect

Inactive Publication Date: 2011-02-09
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The prepared nano-structured TiO 2 The methods all adopt the hydrothermal method to carry out in high-concentration lye and complex equipment autoclave, the reaction time is long, the cost of raw materials is high, and it is not suitable for large-scale production

Method used

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  • Method for preparing nano-TiO2 serving as cathode material of lithium ion battery
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  • Method for preparing nano-TiO2 serving as cathode material of lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0037] The titanium source is 15 grams of chemically pure titanium sulfate, which is dissolved in water. In the experiment, the pH is adjusted to 3 with 10wt.% ammonia water, and the precipitate of titanium is obtained by filtration; the precipitate is beaten with distilled water, and hydrogen peroxide solution is added. The molar ratio is 1. During the reaction, 0.5mol / L sodium hydroxide is used to adjust the pH of the solution to 7, and then react in a stirred reactor at 20°C. After 10 minutes, filter to obtain a titanium solution, and then pour it into a 1000ml beaker. ; Add 10wt.% sodium hydroxide solution to the titanium solution, the molar ratio of sodium hydroxide to titanium is 1; place the beaker on an electric furnace and heat it to 80°C, stir the stirring paddle continuously, and filter to obtain a precipitate after 10 minutes things. The precipitate was treated with 1wt.% HNO 3 Washing 2 times, and then washing 2 times with distilled water to obtain nanostructured...

Embodiment 2

[0039] The titanium source is ilmenite at 120°C, the ratio of acid to mineral is 1.2:1, 5 grams of hydrolyzed high-titanium slag after hydrochloric acid leaching for 2 hours, beat the titanium slag with distilled water, add hydrogen peroxide solution, the molar ratio of hydrogen peroxide and titanium The ratio is 6: 1, and the pH of the solution adjusted with 30wt.% ammonia water is 10.5 and reacted in a stirred reactor at 35° C. for 50 minutes, filtered to obtain the titanium solution, and poured into a 1000ml beaker; Lithium hydroxide solution was added into the solution, and the molar ratio of lithium hydroxide to titanium was 10:1; the beaker was placed on an electric furnace and heated to 140° C., the stirring paddle was constantly stirred, and the precipitate was filtered after 1 hour. The precipitate was treated with 2wt.% HNO 3 Washing 2 times, and then washing 2 times with distilled water to obtain nanostructured TiO 2 The precursor; the precursor was calcined at 600...

Embodiment 3

[0041] The titanium source is 10 grams of chemically pure tetrabutyl titanate, which is dissolved in water to obtain a white flocculent precipitate. Add sodium peroxide solution, the molar ratio of sodium peroxide and titanium is 5: 1, adjust the pH of the solution to 10 with 10wt.% ammonia water in the experiment, react in a stirred reactor at 40°C for 30 minutes, and filter to obtain titanium The solution is poured into a three-necked flask with a volume of 1000ml; lithium hydroxide solution is added to the titanium solution, and the molar ratio of lithium hydroxide to titanium is 10:1; the three-necked flask is placed in an oil bath and heated to 120°C. Stirring was continued with a stirring bar, and a precipitate was obtained by filtration after 1 hour. The precipitate was washed twice with 1wt.% HCl, and then washed twice with distilled water to obtain nanostructured TiO 2 The precursor; the precursor was calcined at 120°C for 10 hours to obtain nano-TiO 2 .

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Abstract

The invention discloses a method for preparing nano-TiO2 serving as a cathode material of a lithium ion battery. The method comprises the following steps of: beating precipitates of titanium prepared from metatitanic acid or various titanium sources by using water, adding a coordinating agent into thick liquid according to a molar ratio of the coordinating agent to the titanium of 1.0:1-10:1, regulating the pH value to be between 7 and 14 by using alkali, reacting in a stirring reactor at the temperature of between 20 and 80 DEG C for 10 to 720 minutes, and filtering to obtain solution of the titanium; and adding the alkali into the solution according to a molar ratio of the alkali to the titanium of 1.0:1-50:1, heating the solution to between 80 and 200 DEG C for 10 to 600 minutes, filtering and washing to obtain a precursor of nano-TiO2, and calcining the precursor at the temperature of 120 and 850 DEG C for 0.5 to 20 hours to obtain the nano-TiO2 serving as the cathode material of the lithium ion battery. The method has the characteristics of wide range of raw materials, simple process flow, low energy consumption, low cost, good appearance of product granularity and excellent electrochemical properties.

Description

Technical field: [0001] The invention belongs to the technical field of lithium ion battery negative electrode material preparation, and relates to a method for preparing lithium ion battery negative electrode material nano-TiO 2 Methods. technical background: [0002] Lithium-ion batteries are a new generation of green and environmentally friendly batteries that were put on the market after the 1990s. They are widely used in portable appliances because of their advantages such as high working voltage, high specific energy, long cycle life, low self-discharge power, no memory effect, and no pollution. and electric vehicles. The anode material of lithium ion battery is one of the key factors restricting its overall performance. The negative electrode materials used in the earliest commercialized lithium-ion batteries are almost all carbon / graphite materials, but because the electrode potential of carbon is very close to that of lithium, when the battery is overcharged, some...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/047
CPCY02E60/122Y02E60/10
Inventor 李新海吴飞翔王志兴郭华军彭文杰胡启阳张云河伍凌王小娟
Owner CENT SOUTH UNIV
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