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TiO2-coated graphite composite particle for lithium ion battery, and preparation method and application thereof

A technology of composite particles and graphite, which is applied in the direction of battery electrodes, circuits, electrical components, etc., can solve problems such as high cost and safety, and achieve the effect of improving safety, good safety, and avoiding lithium precipitation on the surface

Active Publication Date: 2013-09-18
SHANGHAI SHANSHAN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the safety problems and high cost defects existing in the existing lithium-ion battery negative electrode materials, and adopt a method that is not used in the traditional preparation process of lithium-ion battery negative electrode materials, thereby providing A kind of TiO2 for lithium ion battery 2 Coated graphite composite particle and its preparation method and application

Method used

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  • TiO2-coated graphite composite particle for lithium ion battery, and preparation method and application thereof
  • TiO2-coated graphite composite particle for lithium ion battery, and preparation method and application thereof
  • TiO2-coated graphite composite particle for lithium ion battery, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] TiO 2Preparation of sol: Mix tetra-n-butyl titanate, water and diethanolamine at a molar ratio of 8:1:26, stir in a vacuum mixer for 2.5 hours to obtain the final mixture, and then add a water-containing ethanol solution with a water concentration of 15mol / L , the volume of the added aqueous ethanol solution is 1 / 10 of the volume of the final mixed solution, fully stirred until the solution is clear to obtain 0.45mol / L TiO 2 Sol.

[0036] Will D 50 Add the above TiO to 10 μm spherical graphite (Qingdao Hengsheng Graphite Co., Ltd., HSG-10) 2 In the sol, the molar ratio of graphite to tetra-n-butyl titanate is calculated at 80:1, stirred for 1 h, then the obtained mixed slurry is granulated into balls by a spray granulator and dried, and the outlet of the cyclone separator 8 is collected. Material, get the cyclone material that particle size median value is 5-15 μ m. Under the protection of Ar atmosphere, the temperature was raised to 700°C at a rate of 2°C / min at ro...

Embodiment 2

[0042] TiO 2 Preparation of sol: Mix tetra-n-butyl titanate, water, and triethanolamine at a molar ratio of 8:1:18, stir in a vacuum mixer for 2.5 hours to obtain the final mixture, and then add a water-containing ethanol solution with a water concentration of 15mol / L , the volume of the added aqueous ethanol solution is 1 / 10 of the volume of the final mixed solution, fully stirred until the solution is clear to obtain 0.81mol / L TiO 2 Sol.

[0043] Will D 50 Add the above TiO to 10 μm spherical graphite (Qingdao Hengsheng Graphite Co., Ltd., HSG-10) 2 In the sol, the molar ratio of graphite to tetra-n-butyl titanate is calculated at 80:1, stirred for 1 h, then the obtained mixed slurry is granulated into balls by a spray granulator and dried, and the outlet of the cyclone separator 8 is collected. The material, under the protection of Ar atmosphere, was heated at room temperature to 800°C at a rate of 2°C / min, and calcined at 800°C for 4 hours to obtain TiO 2 Coated graphi...

Embodiment 3

[0046] TiO 2 Preparation of sol: Mix tetra-n-butyl titanate, water and monoethanolamine at a molar ratio of 8:1:32, stir in a vacuum mixer for 2.5 hours to obtain the final mixture, and then add a water-containing ethanol solution with a water concentration of 15mol / L , the volume of the added aqueous ethanol solution is 1 / 10 of the volume of the final mixed solution, fully stirred until the solution is clear to obtain 0.39mol / L TiO 2 Sol.

[0047] Will D 50 Add the above TiO to 10 μm spherical graphite (Qingdao Hengsheng Graphite Co., Ltd., HSG-10) 2 In the sol, the molar ratio of graphite to tetra-n-butyl titanate is calculated at 90:1, stirred for 1 h, then the obtained mixed slurry is granulated into balls by a spray granulator and dried, and the outlet of the cyclone separator 8 is collected. The material, under the protection of Ar atmosphere, was heated at room temperature to 800°C at a rate of 2°C / min, and calcined at 800°C for 4 hours to obtain TiO 2 Coated graphi...

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Abstract

The invention provides a TiO2-coated graphite composite particle for a lithium ion battery and a preparation method and application thereof. The method comprises the following steps: (1) mixing spherical graphite with TiO2 sol with stirring so as to obtain mixed slurry; and (2) drying and granulating the mixed slurry by using spray granulation equipment under the protection of inert gas, taking a cyclone material with a median particle diameter of 5 to 15 mu m and subjecting the cyclone material to heat treatment at a temperature of 400 to 800 DEG C under the protection of inert gas; wherein in the step (1), the median particle diameter of the spherical graphite is 5 to 14 mu m, the concentration of TiO2 in the TiO2 sol is 0.2 to 2.0 mol / L, and the spray granulation equipment has an air inlet temperature of 250 to 350 DEG C and an air outlet temperature of 70 to 100 DEG C. According to the invention, high-rate charge and discharge performance of graphite is improved, the phenomenon of precipitation of lithium from the surface of graphite in the process of heavy current charge and discharge is avoided, security of a material is enhanced, an obtained composite material has capacity substantially higher than the capacity of a pure TiO2 material, and the preparation method is simple to operate and applicable to industrial production.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries, in particular to a TiO2 battery for lithium-ion batteries 2 Coated graphite composite particle and its preparation method and application. Background technique [0002] Lithium-ion batteries have been widely researched and applied due to their high energy density, high operating voltage, low self-discharge rate, no memory effect, long cycle life, and no pollution. Negative electrode materials are an important part of lithium-ion batteries, which are mainly divided into three categories: natural graphite, artificial graphite, and composite graphite. Graphite materials have excellent intercalation / deintercalation properties, high capacity, and abundant resources. Graphite has an obvious discharge platform, and the discharge platform is low (0.01~0.2VvsLi + / Li), easily lead to Li + The precipitation of dendrites brings about safety issues for lithium-ion batteries. Among them, the mesophas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38
CPCY02E60/10
Inventor 沈龙牟国洪董爱想乔永民娄文君张华杜旭
Owner SHANGHAI SHANSHAN TECH CO LTD
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