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Preparation method of lithium titanate-graphene combination electrode material

A graphene composite and electrode material technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of limited improvement in conductivity and no increase in specific capacity, and achieve high specific capacity, good performance in large rate, and simple preparation process flexible effects

Inactive Publication Date: 2010-11-03
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Pan Zhonglai et al. (Publication No.: CN 101431154A) and Xu Ning et al. (Publication No.: CN101378119A) carried out carbon-coating on lithium titanate by different methods. Although its performance was improved to some extent, its conductivity was limited and its specific capacity was not. improve

Method used

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  • Preparation method of lithium titanate-graphene combination electrode material
  • Preparation method of lithium titanate-graphene combination electrode material
  • Preparation method of lithium titanate-graphene combination electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Weigh 3.9975 grams of anhydrous lithium acetate and 23.9539 grams of tetrabutyl titanate at a molar ratio of Li:Ti=0.86:1, and use ethanol as a dispersant to dissolve anhydrous lithium acetate and tetrabutyl titanate in In ethanol, mix the two solutions with stirring. 10ml of acetic acid was added dropwise. Stir at a constant temperature for 4 hours at 80°C to obtain the precursor, and dry at 120°C to obtain the precursor. The precursor was dispersed in deionized water to form a suspension, and the suspension was spray-dried to obtain a powder. The temperature of the hot air was 140°C. Raise the temperature to 800°C at 5°C / min in a muffle furnace, keep the temperature constant for 12h, cool down to room temperature naturally, grind, and pass through a 150-mesh sieve to obtain nano-lithium titanate powder. Lithium titanate with a single spinel structure after X-ray powder diffraction (XRD) test, see figure 1 (a).

[0026] Mix 2.0002g of natural flake graphite and 2.0...

Embodiment 2

[0031] Weigh 4.3015 grams of anhydrous lithium acetate and 27.2309 grams of tetrabutyl titanate at a molar ratio of Li:Ti=0.81:1, and use ethanol as a dispersant to dissolve anhydrous lithium acetate and tetrabutyl titanate in In ethanol, mix the two solutions with stirring. 10ml of acetic acid was added dropwise. Stir at a constant temperature for 10 hours at 40°C to obtain a precursor, and dry at 80°C to obtain a precursor. The precursor was dispersed in deionized water to form a suspension, and the suspension was spray-dried to obtain a powder. The temperature of the hot air was 140°C. Raise the temperature to 1000°C at a rate of 5°C / min in a muffle furnace, keep the temperature constant for 6 hours, cool down to room temperature naturally, grind, and pass through a 150-mesh sieve to obtain nano-lithium titanate powder.

[0032] Mix 2.0006g of natural flake graphite and 2.0021g of sodium nitrate, add 120ml of concentrated sulfuric acid solution, stir in an ice-water bath ...

Embodiment 3

[0036] Weigh 6.2043 grams of anhydrous lithium acetate and 40.0000 grams of tetrabutyl titanate at a molar ratio of 0.8:1, and use ethanol as a dispersant to dissolve the anhydrous lithium acetate and tetrabutyl titanate in ethanol respectively, and stir Mix the two solutions. 10ml of acetic acid was added dropwise. Stir at a constant temperature for 8 hours at 60°C to obtain a precursor, and dry at 100°C to obtain a precursor. The precursor was dispersed in deionized water to form a suspension, and the suspension was spray-dried to obtain a powder. The temperature of the hot air was 140°C. Raise the temperature to 700°C at 5°C / min in a muffle furnace, keep the temperature constant for 18h, cool down to room temperature naturally, grind, and pass through a 150-mesh sieve to obtain nano lithium titanate powder.

[0037] Mix 1.9998g of natural flake graphite and 2.0007g of sodium nitrate, add 100ml of concentrated sulfuric acid solution, stir in an ice-water bath for 20 minute...

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Abstract

The invention relates to a preparation method of lithium titanate-graphene combination electrode material, belonging to the field of electrochemical power source; in the invention, the lithium titanate and graphite oxide are mixed and are prepared into titanate-graphene combination electrode material by heating under inert atmosphere; in the synthesized lithium titanate-graphene combination electrode material, metallic lithium is used as the cathode for preparing a battery, and the first charging and discharging capacity exceeds 186mAh / g when 10C charging and discharging is carried out; after 100 circles of the charging and discharging are carried out, the discharging capacity is higher than 116mAh / g. the method in the invention has low cost, and simple and flexible preparation procedures, and is suitable for industrial large-scale production. High multiplying power of the prepared titanate-graphene combination electrode material has good performance, and the combination electrode material has high specific capacity and can be widely applied to lithium ion batteries of various kinds of potable electronic equipment and various electric motors.

Description

technical field [0001] The invention relates to the field of key materials for lithium-ion secondary batteries, in particular to a method for preparing a lithium titanate-graphene composite electrode material, in particular to a lithium titanate electrode composite for high-rate charge-discharge performance of lithium-ion batteries A material and a preparation method thereof belong to the field of electrochemical power sources. Background technique [0002] At present, the research focus of negative electrode materials for lithium-ion batteries is developing in the direction of power battery materials with high specific capacity, large rate, high cycle performance and high safety performance. The traditional negative electrode material is carbon negative electrode material. Although the carbon anode has been successfully commercialized, its battery safety problems, especially at high rates, force people to look for safe and reliable new anode materials that can intercalate ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/139
CPCY02E60/122Y02E60/10
Inventor 王海辉田冰冰廉培超
Owner SOUTH CHINA UNIV OF TECH
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