Preparation method for lithium titanate and graphene composite electrode materials

A graphene composite and electrode material technology, applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of limited contact area, restrict the application of electric vehicles, hinder the industrialization of electric vehicles, etc., and achieve the improvement of electronic conductance and ion conductance, Good rate charge and discharge performance, easy to control the preparation process

Active Publication Date: 2012-07-11
深圳石墨烯创新中心有限公司
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lithium-ion power batteries currently being studied usually use lithium iron phosphate, nickel-cobalt-manganese ternary materials, and lithium manganese oxide as positive electrode materials, and carbon materials as negative electrode materials. When the battery is used in an abnormal state, the lithium-intercalated carbon negative electrode material will react violently with the electrolyte, releasing a large amount of heat and flammable gas, causing the battery to fail or even explode.
The safety problem of large-capacity and high-power lithium-ion power batteries using carbon materials as negative electrodes has not been effectively resolved, which seriously restricts its application in electric vehicles, so how to solve the safety problem of lithium-ion power batteries has become a problem The fundamental problem of its industrialization

Method used

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  • Preparation method for lithium titanate and graphene composite electrode materials
  • Preparation method for lithium titanate and graphene composite electrode materials
  • Preparation method for lithium titanate and graphene composite electrode materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Weigh 2.00g cetyltrimethylammonium bromide (CTAB), 0.32g urea (CON 2 h 4 ) and 0.96g lithium hydroxide (LiOH.H 2 O) Dissolve in 60ml of deionized water and stir for 1 hour to obtain a stable solution A with a lithium ion concentration of about 0.4mol / L.

[0032] (2) In the state of ultrasonic treatment, add 4.08ml of butyl titanate to 30ml of deionized water, sonicate for 15min, and stir for 1h to prepare a solution B with a titanium ion concentration of 0.4mol / L.

[0033] (3) Add solution A to solution B under the action of an ultrasonic field, stir for 5 min, and then add 5ml of hydrazine hydrate to obtain solution C.

[0034] (4) Transfer the obtained solution C into a polytetrafluoroethylene reactor, put it into an oven, and react at 180°C for 48 hours.

[0035] (5) Suction filter, wash, and dry the obtained solution, and finally sinter at 600°C for 6 hours under an argon atmosphere. After cooling, the lithium titanate product is obtained, and its morphology ...

Embodiment 2

[0038] (1) Weigh 2.00g cetyltrimethylammonium bromide (CTAB), 0.32g urea (CON 2 h 4 ) and 0.96g lithium hydroxide (LiOH.H 2 O) Dissolve in 60ml of deionized water and stir for 1 hour to obtain a stable solution A with a lithium ion concentration of about 0.4mol / L.

[0039] (2) In the state of ultrasonic treatment, add 7ml of graphene solution with a concentration of 0.3g / L to 23ml of deionized water, then add 4.08ml of butyl titanate, ultrasonic for 15min, and stir for 1h to obtain the concentration of titanium ions It is solution B of 0.4mol / L.

[0040] (3) Add solution A to solution B under the action of an ultrasonic field, stir for 5 min, and then add 5ml of hydrazine hydrate to obtain solution C.

[0041] (4) Transfer the obtained solution C into a polytetrafluoroethylene reactor, put it into an oven, and react at 180°C for 48 hours.

[0042] (5) Suction filter, wash, and dry the obtained solution, and finally sinter at 600°C for 6 hours under an argon atmosphere. Aft...

Embodiment 3

[0045] (1) Weigh 2.00g cetyltrimethylammonium bromide (CTAB), 0.32g urea (CON 2 h 4 ) and 0.96g lithium hydroxide (LiOH.H 2 O) Dissolve in 60ml of deionized water and stir for 1 hour to obtain a stable solution A with a lithium ion concentration of about 0.4mol / L.

[0046] (2) In the state of ultrasonic treatment, add 13ml of graphene solution with a concentration of 0.3g / L to 17ml of deionized water, then add 4.08ml of butyl titanate, ultrasonic for 15min, and stir for 1h to obtain the concentration of titanium ions It is solution B of 0.4mol / L.

[0047] (3) Add solution A to solution B under the action of an ultrasonic field, stir for 5 min, and then add 5ml of hydrazine hydrate to obtain solution C.

[0048] (4) Transfer the obtained solution C into a polytetrafluoroethylene reactor, put it into an oven, and react at 180°C for 48 hours.

[0049] (5) Suction filtration, washing, and drying of the obtained solution, and finally sintering at 600° C. for 6 hours under an ar...

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Abstract

A preparation method for lithium titanate and graphene composite electrode materials comprises the following steps: solution A containing lithium ion is prepared by dissolving surface-active agent, template agent and lithium compound into deionized water; titanium compound is added into graphene solution with the concentration of 0.1 to 0.5 g/l, and solution B containing titanium ions is prepared through ultrasound and stirring; under the effect of ultrasonic wave field, the solution A is added into the solution B, then bonding agent is added, and solution C is prepared; the solution C is moved into a polytetrafluoroethylene reaction kettle, and reaction is performed under 140 to 200 DEG C; then leaching, washing and drying to the solution are performed, and eventually, composite products are produced under the atmosphere of argon gas. The lithium titanate in the composite product is nanosheet lithium titanate, can be fully mixed and contacted with the sheet graphene, and the electric conductance and ion electric conductance of the lithium titanate material are improved greatly; and the composite product is classified as electrode material with excellent and high rate charge-discharge performance.

Description

technical field [0001] The invention relates to a method for preparing a composite material of lithium titanate and graphene, in particular to a method for preparing a composite electrode material of sheet lithium titanate and graphene and the composite electrode material. Background technique [0002] Energy and environmental problems are becoming more and more serious, and the development and use of clean energy is imminent. The development of electric vehicles is an inevitable trend of future development. The large-scale application of green energy such as wind energy, solar energy, and geothermal energy has put forward higher requirements for energy storage devices, especially for the service life of energy storage batteries. [0003] The rapid development of various electronic devices as well as electric vehicles and hybrid vehicles has put forward more stringent requirements for lithium-ion batteries that provide energy, especially their power performance. The current...

Claims

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Application Information

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IPC IPC(8): H01M4/485H01M4/38
CPCY02E60/122Y02E60/10
Inventor 李宝华宁峰贺艳兵杨全红杜鸿达康飞宇
Owner 深圳石墨烯创新中心有限公司
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