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Preparation method of carbon nanotube lithium titanate composite cathode material

A technology of carbon nanotubes and negative electrode materials, applied in battery electrodes, electrical components, circuits, etc., can solve the problems of low electronic conductivity and ionic conductivity, and achieve good rate performance, good cycle stability, and good high-rate charging. The effect of discharge performance

Inactive Publication Date: 2017-06-13
北京朗盛特耐科技有限公司
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  • Application Information

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Problems solved by technology

[0007] The invention proposes a method for preparing a carbon nanotube lithium titanate composite negative electrode material, which solves the problem of low electronic conductivity and ion conductivity of the carbon nanotube lithium titanate composite negative electrode material in the prior art

Method used

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  • Preparation method of carbon nanotube lithium titanate composite cathode material
  • Preparation method of carbon nanotube lithium titanate composite cathode material
  • Preparation method of carbon nanotube lithium titanate composite cathode material

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Embodiment 1

[0031] Add carbon nanotube powder with a diameter of about 2 nm into ethanol and disperse ultrasonically for 1 hour to obtain a solution A with a concentration of 3 g / L. Tetrabutyl titanate and lithium hydroxide were selected as the titanium source compound and the lithium source compound, respectively. According to the molar ratio of lithium to titanium of 0.8:1, 1ml of 30% hydrogen peroxide and 1mmol of tetrabutyl titanate were successively added to 20ml of 0.4M lithium hydroxide aqueous solution, and stirred until completely dissolved. Finally, the above solution was mixed with solution A according to the mass ratio of carbon nanotubes and lithium titanate of 7:93. The resulting mixed solution was poured into a 50ml stainless steel reaction kettle with polytetrafluoroethylene as a liner, sealed and placed in a blast drying oven, and reacted for 12 hours at 150°C. After naturally cooling to room temperature, the reaction product was poured out, centrifuged, washed, and free...

Embodiment 2

[0033] Add carbon nanotube powder with a diameter of about 1 nm into ethanol and disperse ultrasonically for 2 hours to obtain a solution A with a concentration of 1 g / L. Tetrabutyl titanate and lithium acetate were selected as the titanium source compound and lithium source compound, respectively. The above-mentioned tetrabutyl titanate and lithium acetate were dissolved in ethanol to prepare a solution B with a concentration of 1 kg / L. According to the molar ratio of lithium and titanium 0.84: 1, the mass percentage of carbon nanotubes in the composite negative electrode material is 10wt.%, the ethanol solution of solution B and oxalic acid prepared are added to the ethanol solution of carbon nanotubes successively while stirring . The pH value of the above mixed solution was adjusted to 5.6 with ammonia water. Stir at 30°C for 3 hours, then raise the temperature to 60°C, and stir until gelatinous. The wet gel-like substance obtained above is converted into a dry gel prec...

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Abstract

The invention provides a preparation method of a carbon nanotube lithium titanate composite cathode material. The preparation method includes: ultrasonically dispersing carbon nanotube powder into a solvent to obtain a carbon nanotube solution A; under a stirring or ultrasonic condition, adding a lithium source compound, a titanium source compound and a catalyst into the solution A, and regulating pH to obtain a solution B; using a liquid-phase method to process the solution B, and drying obtained solid to obtain carbon nanotube lithium titanate composite precursor powder; calcining the precursor powder in inert gas, and cooling to obtain the carbon nanotube lithium titanate composite cathode material. The preparation method has the advantages that the prepared carbon nanotube lithium titanate composite cathode material is high in electron conductivity and ion conductivity, high in phase purity and good in circulation stability, and large-scale production can be achieved easily.

Description

technical field [0001] The invention relates to the technical field of battery electrode materials, in particular to a preparation method of a carbon nanotube lithium titanate composite negative electrode material. Background technique [0002] In the context of advocating energy saving and environmental protection, low-cost, pollution-free electrochemical energy storage devices have become an important field of research, among which, the research and development and application of lithium-ion batteries and supercapacitors have always been in a leading position. Lithium-ion batteries and supercapacitors play an important role in people's daily life, such as providing power for portable electronic devices such as mobile phones and laptops, for energy recovery and powering electric motors in plug-in hybrid electric vehicles, etc. [0003] Supercapacitors have the advantages of high power density and long cycle life, and can provide backup power for batteries or fuel cells in t...

Claims

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Application Information

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IPC IPC(8): H01M4/36
CPCH01M4/364Y02E60/10
Inventor 徐丽丽
Owner 北京朗盛特耐科技有限公司
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