Lithium-titanate composite negative pole material and preparation method thereof

A technology of negative electrode material and composite material, which is applied in the field of lithium titanate-based composite negative electrode material and its preparation, can solve the problems of limiting performance, unable to effectively suppress the phenomenon of stacking and agglomeration of graphene sheets, etc.

Active Publication Date: 2013-06-12
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the three-dimensional porous graphene material described in this patent is treated by a hydrothermal method, which still cannot effectively inhibit the stacking of graphene sheets and perhaps the agglomeration phenomenon during the sintering process, which limits its performance to a certain extent. to play

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065]Acidification of carbon nanotubes: Weigh an appropriate amount of carbon nanotubes and place them in a three-necked flask, add a certain amount of concentrated sulfuric acid and concentrated nitric acid, so that the mass ratio of the two is 3:1, and the total mass of concentrated sulfuric acid and concentrated nitric acid is carbon nanotubes. 40 times the size of the tube, ultrasonically disperse for 0.5h, reflux in an oil bath at 100°C for 2h, dilute the solution with distilled water, remove the supernatant, rinse several times, and filter with a polyethylene microporous filter membrane with a pore size of 0.2μm. After washing with water until neutral, acidified carbon nanotubes are obtained after vacuum drying.

[0066] Preparation of graphene / carbon nanotube composite material: Weigh an appropriate amount of graphene oxide and carbon nanotube after acidification treatment, so that the mass percentage of graphene in the graphene / carbon nanotube composite material is 0.0...

Embodiment 2

[0070] First acidify the carbon nanotubes, the method is the same as in Example 1, the difference is that in the acidification process, ultrasonic 1h, reflux in an oil bath at 130 ° C for 1h, and then prepare a graphene / carbon nanotube composite material, the method is the same as in Example 1, but different What is more, the mass percentage of graphene in the graphene / carbon nanotube composite material is 50%, after adding hydrazine, react for 26h.

[0071] Preparation of lithium titanate-based composite negative electrode material: Dissolve lithium hydroxide, titanium tetrachloride and citric acid in an appropriate amount of solvent and stir rapidly until a uniform solution A is formed, wherein the molar concentration of lithium ions is 0.5mol / L, lithium ions The molar ratio of titanium to titanium is 4:5, and the molar ratio of titanium to citric acid is 1:0.5. Add an aqueous solution of calcium nitrate and nickel nitrate with a total concentration of 0.01mol / L to solution ...

Embodiment 3

[0074] First acidify the carbon nanotubes, the method is the same as in Example 1, the difference is that in the acidification process, ultrasonic 0.6h, reflux in an oil bath at 120 ° C for 1.5h, and then prepare the graphene / carbon nanotube composite material, the method is the same as in Example 1 , the difference is that the mass percentage of graphene in the graphene / carbon nanotube composite material is 20%, and react for 20h after adding hydrazine.

[0075] Preparation of lithium titanate-based composite negative electrode material: Dissolve lithium nitrate, titanium isopropoxide and citric acid in an appropriate amount of solvent and stir rapidly until a uniform solution A is formed, wherein the molar concentration of lithium ions is 0.8mol / L, lithium and The molar ratio of titanium is 4:5, and the molar ratio of titanium to citric acid is 1:0.3. Add 0.1 mol / L aqueous solution of ruthenium chloride dropwise to solution A so that the mass of ruthenium element is 0.5% of ...

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Abstract

The invention relates to a lithium-titanate composite negative pole material and a preparation method thereof. The lithium-titanate composite negative pole material provided by the invention comprises lithium titanate, doping elements and a graphene/carbon nanotube composite material. The preparation method comprises the following steps: preparing a titanium source, a lithium source, soluble compounds of doping elements and the graphene/carbon nanotube composite material into a precursor by sol-gel in-situ synthesis, and calcining the precursor at 400-1100 DEG C to obtain the lithium-titanate composite negative pole material. The graphene/carbon nanotube composite material is utilized to effectively improve the electronic conductivity and rate capability of the lithium-titanate negative pole material; and the doping elements are introduced to effectively enhance the electrochemical properties and loop stability of the lithium-titanate negative pole material. The lithium-titanate negative pole material provided by the invention has wide application prospects in the field of lithium ion batteries.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries and supercapacitors, in particular, the invention relates to a lithium titanate composite negative electrode material and a preparation method thereof. Background technique [0002] The negative electrode material is one of the key materials of lithium-ion batteries. At present, most of the negative electrode materials used in lithium-ion batteries are lithium-intercalated graphitized carbon materials. However, there are some problems in the practical application of such materials, such as, the initial charge and discharge efficiency is relatively low. Low, the volume changes during charging and discharging, it is easy to form lithium dendrites to cause a short circuit, and the decomposition of the electrolyte poses a safety hazard. In contrast, lithium titanate with a spinel structure has a theoretical capacity of 175mAh / g, and the insertion and deintercalation of lithium ions have ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/62H01M4/131H01M4/1391
CPCY02E60/10
Inventor 谭强强徐宇兴吕霄
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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