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Preparation method and application of graphene/lithium titanate composite material

A composite material and graphene technology, applied in the field of electrochemistry, can solve the problems of poor dispersion of composite materials, poor cycle performance, uneven particle size of lithium titanate, etc., and achieve the effect of uniform dispersion and small particle size

Inactive Publication Date: 2015-05-06
江苏江大环保科技开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to aim at the existing graphene / lithium titanate composite material with high process requirements, non-uniform lithium titanate particle size, unsatisfactory electrical conductivity of lithium titanate composite material, poor cycle performance, and poor dispersion of the composite material To provide a new preparation method of graphene / lithium titanate composite material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Add 0.03mol tetrabutyl titanate, 0.15g graphene, and 0.5g surfactant to a 500ml special microwave reaction flask, add 200mL of tert-butanol to disperse, place in an ultrasonic generator and vibrate for 15 minutes to prepare Titanium source solution, add 0.024mol lithium acetate dihydrate to a 500mL beaker, add 10mL of deionized water to dissolve, and add 200mL of tert-butanol to dilute to make a lithium source solution, put the titanium source into a microwave reactor to heat up , make it reflux, and after reflux, use a 250mL dropping funnel to slowly drip the lithium source solution into one mouth of the flask, and react for 2 hours after the dripping is completed. After removing the solvent, the precursor of the graphene / lithium titanate composite material is obtained. Put the body into a tube furnace, heat up to 800°C, and sinter for 12 hours to prepare 3g of graphene / lithium titanate composite material; 0.3g of graphene / lithium titanate composite material, 37.5mg of ...

Embodiment 2

[0033] Add 0.03mol tetrabutyl titanate, 0.15g graphene, and 1g surfactant into a 500ml special microwave reaction flask, add 200mL of tert-butanol to disperse, place in an ultrasonic generator and vibrate for 15 minutes, and prepare titanium Source solution, add 0.024mol lithium acetate dihydrate to a 500mL beaker, add 10mL of deionized water to dissolve, and add 200mL of tert-butanol to dilute to form a lithium source solution, put the titanium source into a microwave reactor to heat up, Make it reflux, and after reflux, use a 250mL dropping funnel to slowly drip the lithium source solution in one mouth of the flask, and react for 1h after the dripping is completed. After removing the solvent, the precursor of the graphene / lithium titanate composite material is obtained. Put it into a tube furnace, heat up to 800°C, and sinter for 12 hours to prepare 3g of graphene / lithium titanate composite material; 0.3g of graphene / lithium titanate composite material, 37.5mg of acetylene bl...

Embodiment 3

[0035] 0.03mol tetrabutyl titanate, 0.3g graphene, and 0.3g surfactant were added to a 500ml special microwave reaction flask, and 200mL of tert-butanol was added to disperse, placed in an ultrasonic generator and vibrated for 20 minutes to prepare Titanium source solution, add 0.024mol lithium acetate dihydrate to a 500mL beaker, add 5mL of deionized water to dissolve, and add 200mL of tert-butanol to dilute to make a lithium source solution, put the titanium source into a microwave reactor to heat up , make it reflux, and after reflux, use a 250mL dropping funnel to slowly drip the lithium source solution into one mouth of the flask, and react for 2 hours after the dripping is completed. After removing the solvent, the precursor of the graphene / lithium titanate composite material is obtained. Put the body into a tube furnace, heat up to 800°C, and sinter for 12 hours to prepare 3g of graphene / lithium titanate composite material; 0.3g of graphene / lithium titanate composite mat...

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Abstract

The invention provides a preparation method and application of a graphene / lithium titanate composite material. The preparation method comprises the following steps: preparing a titanium source dispersion liquid from tetrabutyl titanate, graphene, P123 and tert-butyl alcohol, and preparing a lithium source solution from lithium acetate dihydrate, deionized water and tert-butyl alcohol; transferring the titanium source dispersion liquid to a microwave reactor and heating the titanium source dispersion liquid till reflux, adding the lithium source solution to react for a certain time, cooling the reactant, removing a solvent and then drying the product, thus obtaining a graphene-based lithium titanate precursor; placing the obtained graphene-based lithium titanate precursor in a tube furnace to be calcined at a certain temperature for a certain time under the protection of an inert gas, thus obtaining the graphene / lithium titanate composite material. The obtained active material, acetylene black and PVDF (polyvinylidene fluoride) are mixed uniformly to coat an aluminium foil to prepare an electrode slice of a button cell, finally a half cell is assembled in a glove box, charge and discharge performances are tested, the half cell is made from the active material and the performances are detected. Through detection, the capacity of graphene / lithium titanate under the condition of 1C rate is still 140mAh / g, can still keep more than 99% of capacity after circulation for 1000 times, and has excellent performances.

Description

technical field [0001] The invention relates to a preparation method and application of a graphene / lithium titanate composite material, belonging to the technical field of electrochemistry. Background technique [0002] Energy and environmental problems are becoming more and more serious, and the development and use of clean energy is imminent. Under the premise of large-scale application of green new energy such as wind energy, solar energy, and geothermal energy, people have higher and higher requirements for energy storage devices, especially the cycle of batteries. life. In the automotive industry, the rapid development of electric vehicles and hybrid vehicles has put forward more stringent requirements for lithium-ion batteries that provide energy, especially their power performance and cycle performance. Due to the shortcomings of other negative electrode materials, lithium titanate As a new type of negative electrode material, it has many advantages, such as good saf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/62H01M4/131
CPCH01M4/131H01M4/1391H01M4/485H01M4/62H01M10/0525H01M2004/027Y02E60/10
Inventor 李在均陈腾远蔡金飞张明
Owner 江苏江大环保科技开发有限公司
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