Method for preparing carbon-coated nano lithium titanate by rheological phase reaction

A nano-lithium titanate and carbon coating technology, applied in nano-carbon, nano-technology, nano-technology and other directions, can solve the problems of poor material rate performance, and achieve the effects of good rate performance, low synthesis temperature and uniform distribution

Inactive Publication Date: 2012-06-27
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to prepare lithium titanate Li for traditional solid state reaction 4 Ti 5 o 12 The relatively large particle size of the material and the poor material rate performance caused by the poor electronic conductivity of the pure-phase lithium titanate material provide a method that can improve the material rate performance, has excellent electrochemical performance, and has a simple process flow and is easy to implement. Preparation method of carbon-coated nano-lithium titanate material synthesized by rheological phase method in large-scale production

Method used

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  • Method for preparing carbon-coated nano lithium titanate by rheological phase reaction
  • Method for preparing carbon-coated nano lithium titanate by rheological phase reaction
  • Method for preparing carbon-coated nano lithium titanate by rheological phase reaction

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Effect test

Embodiment 1

[0023] a. Weigh Li according to the molar ratio of lithium and titanium elements of 0.84:1 2 CO 3 and anatase TiO 2 , and added 2wt% of PVB (2% of the mass of theoretically synthesized lithium titanate), ball milled in a mixing tank at a speed of 400 rpm for 6 hours.

[0024] b. Add an appropriate amount of absolute ethanol solvent, stir slowly, adjust the mixture to a colloidal rheological state, and then dry it in a vacuum oven at 80° C. for 6-12 hours to obtain a precursor.

[0025] c. Place the precursor in a tube furnace, program the temperature in a nitrogen atmosphere, raise the temperature to 900°C at 5°C / min, keep it for 12 hours, and cool it down to room temperature naturally to obtain a carbon-coated nano-lithium titanate material.

Embodiment 2

[0027] a. Weigh Li according to the molar ratio of lithium and titanium elements of 0.83:1 2 CO 3 and anatase TiO 2 , and added 6wt% PVB (6% of the mass of theoretically synthesized lithium titanate), ball milled in a mixing tank at a speed of 400 rpm for 8 hours.

[0028] b. Add an appropriate amount of absolute ethanol solvent, stir slowly, adjust the mixture to a colloidal rheological state, and then dry it in a vacuum oven at 80° C. for 6-12 hours to obtain a precursor.

[0029] c. Place the precursor in a tube furnace, program the temperature in a nitrogen atmosphere, raise the temperature to 850°C at 5°C / min, keep it for 14 hours, and cool it down to room temperature naturally to obtain a carbon-coated nano-lithium titanate material.

Embodiment 3

[0031] a. Weigh Li according to the molar ratio of lithium and titanium elements of 0.85:1 2 CO 3 and anatase TiO 2 , and added 10wt% PVB (10% of the theoretically synthesized lithium titanate mass), ball milled in a mixing tank at a speed of 400 rpm for 8 hours.

[0032] b. Add an appropriate amount of absolute ethanol solvent, stir slowly, adjust the mixture to a colloidal rheological state, and then dry it in a vacuum oven at 80° C. for 6-12 hours to obtain a precursor.

[0033] c. Put the precursor in a tube furnace, program the temperature in a nitrogen atmosphere, raise the temperature to 800°C at 5°C / min, keep it warm for 16 hours, and cool it down to room temperature naturally to obtain a carbon-coated nano-lithium titanate material.

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Abstract

The invention discloses a method for preparing carbon-coated nano lithium titanate by rheological phase reaction, which comprises the following steps: mechanically mixing three raw materials: anatase titanium oxide, a lithium salt, and an additive polyvinyl butyral (PVB), adding a proper amount of an organic solvent to regulate the mixed raw materials to a rheological state, oven-drying, and calcinating in a tube furnace under protective atmosphere. Because the method uses rheological phase reaction and uses PVB as the additive, the prepared carbon-coated lithium titanate material has nanoparticles, perfect morphology and uniform particle size distribution, and a uniform, dense and firm carbon-coated layer is formed on the surface of lithium titanate, which greatly improves the electrical conductivity of lithium titanate and effectively improves the cycle performance and multiplying factor performance of the material. The method of the invention is simple, the prepared material has stable performance and simple and controllable process flow, can realize industrial production, and the prepared carbon-coated nano lithium titanate material has excellent electrochemical properties and has a wide application prospect in the field of power batteries.

Description

technical field [0001] The invention belongs to the technical field of preparation of electrochemical power source materials, in particular to a carbon-coated nano-lithium titanate (Li 4 Ti 5 o 12 / C) preparation method. It has broad application prospects in the field of commonly used secondary lithium ion batteries and power energy battery anode materials. Background technique [0002] In today's world, with the shortage of global oil resources and the intensification of atmospheric pollution, energy-saving and environmentally friendly hybrid electric vehicles (HEV) and pure electric vehicles (EV) are currently receiving special attention and great development. The demand for large-capacity, high-power, and high-safety chemical power supplies for electric vehicles is increasingly urgent. Lithium-ion batteries have become one of the main power sources for electric vehicles due to their high energy density, high operating voltage, and no memory effect. At present, the co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/00C01B31/02B82Y30/00B82Y40/00H01M4/485H01M4/62C01B32/15
CPCY02E60/122Y02E60/10
Inventor 郭钰静杨茂萍王康平
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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