Method for preparing carbon-coated nano-particle lithium titanate electrode material

A microsphere lithium titanate, electrode material technology, applied in battery electrodes, nanotechnology, nanotechnology and other directions, can solve the problems of affecting high-rate charge and discharge performance, poor electronic conduction, low electronic conductivity, etc., to achieve easy control. and automatic operation, excellent electrochemical performance, simple process effect

Active Publication Date: 2013-02-06
DO FLUORIDE NEW ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Currently, Li 4 Ti 5 o 12 The main problem faced by the material is its inherent low electronic conductivity (-13 S / cm), which is an insulating material; the poor conductivity makes the electronic conduction unsmooth during high-rate charge and discharge, and the capacity decays quickly, which affects its high-rate charge and discharge performance.

Method used

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  • Method for preparing carbon-coated nano-particle lithium titanate electrode material
  • Method for preparing carbon-coated nano-particle lithium titanate electrode material
  • Method for preparing carbon-coated nano-particle lithium titanate electrode material

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Embodiment 1

[0030] The preparation method of the carbon-coated nano-microsphere lithium titanate electrode material of the present embodiment comprises the following steps:

[0031] 1) Preparation of raw material solution: weigh lithium carbonate and nano-TiO according to the molar ratio of 1:1:10 2 And polyethylene glycol, add deionized water, be mixed with the mixed solution of mass fraction 7%;

[0032] 2) Spray drying: Use ammonia water to adjust the pH of the mixed solution obtained in step 1) to 7.0, keep it warm at 40°C, and continue stirring at 300rpm for 1h, pass through a spray dryer, and spray dry at 150°C to obtain polyethylene glycol-coated Nano-microsphere lithium titanate precursor, drying the pre-coated precursor in a vacuum oven at 120°C for 4 hours to obtain the precursor powder;

[0033] 3) Sintering: Sinter the precursor powder obtained in step 2) in an atmosphere rotary furnace under the protection of high-purity nitrogen, control the temperature at 100°C, sinter for...

Embodiment 2

[0036] The preparation method of the carbon-coated nano-microsphere lithium titanate electrode material of the present embodiment comprises the following steps:

[0037] 1) Preparation of raw material solution: weigh lithium citrate and nano-TiO according to the molar ratio of 1:1:5 2 And polypropanol, add in dehydrated ethanol, be mixed with the mixed solution of mass fraction 5%;

[0038] 2) Spray drying: Use ammonia water to adjust the pH of the mixed solution obtained in step 1) to 8.0, keep it warm at 30°C, and continue stirring at 300rpm for 1.5h, and spray dry it through a spray dryer at 180°C to obtain polypropanol-coated nano Microspherical lithium titanate precursor, drying the pre-coated precursor in a vacuum oven at 120°C for 3 hours to obtain the precursor powder;

[0039] 3) Sintering: Sinter the precursor powder obtained in step 2) in an atmosphere rotary furnace under the protection of high-purity nitrogen, control the temperature at 200°C, sinter for 2 hours,...

Embodiment 3

[0041] The preparation method of the carbon-coated nano-microsphere lithium titanate electrode material of the present embodiment comprises the following steps:

[0042]1) Preparation of raw material solution: weigh lithium nitrate and nano-TiO according to the molar ratio of 1:1:20 2 And polyglycolic acid, add in the mixed solution of deionized water and dehydrated alcohol, be mixed with the mixed solution of mass fraction 10%;

[0043] 2) Spray drying: use ammonia water to adjust the pH of the mixed solution obtained in step 1) to 7.0, keep it warm at 20°C, and continue stirring at 300rpm for 2h, pass through a spray dryer, and spray dry at 200°C to obtain polyglycolic acid-coated nanoparticles. Microspherical lithium titanate precursor, drying the pre-coated precursor in a vacuum oven at 120°C for 2 hours to obtain the precursor powder;

[0044] 3) Sintering: Sinter the precursor powder obtained in step 2) in an atmosphere rotary furnace under the protection of high-purity...

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Abstract

The invention discloses a method for preparing a carbon-coated nano-particle lithium titanate electrode material, wherein the method comprises the following steps of: (1), adding a lithium source compound, nano-TiO2 and macromolecular hydrocarbon into a dispersing agent to prepare into a mixed solution; (2), adjusting pH of the mixed solution obtained in the step (1) to 7.0-8.5, after continuously stirring, spraying and drying to prepare a precursor, drying in vacuum at 120 DEG C, and preparing precursor powder; and (3), sintering the precursor powder obtained in the step (2) under the protection of atmosphere, sieving through a 300-mesh sieve after cooling, and then obtaining the carbon-coated nano-particle lithium titanate material. According to the invention, the carbon-coated lithium titanate electrode material with uniform nano size and particle morphology is prepared; the electrical conductivity of lithium titanate is improved; the rate charging and discharging performances of the material are increased; therefore, the material has high specific capacity and good rate capability and cycle performance; and the preparation method disclosed by the invention is simple in process and easy for control and automatic operation and is applied to scale production.

Description

technical field [0001] The invention belongs to the technical field of lithium titanate electrode materials, and in particular relates to a preparation method of carbon-coated nano microsphere lithium titanate electrode materials. Background technique [0002] Li 4 Ti 5 o 12 It has a spinel structure and a high theoretical lithium intercalation specific capacity (175mAh / g). It is a "zero strain" material, and the crystal structure of the material changes little during the Li+ intercalation and extraction process, so the material has stable cycle performance; Higher lithium intercalation potential (1.55V vs. Li + / Li), which is higher than the reduction potential of common electrolytes (0.8V vs. Li + / Li), so it does not react with it and does not cause the precipitation of metal lithium, so it has good safety performance; compared with carbon materials, it has a higher lithium ion chemical diffusion coefficient (2×10 -8 cm 2 / s), Li+ has a fast migration rate in it, wh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/62C01G23/00B82Y30/00
CPCY02E60/122Y02E60/10
Inventor 李云峰侯红军杨华春罗成果罗传军李凌云詹小军白英刚李霞
Owner DO FLUORIDE NEW ENERGY TECHNOLOGY CO LTD
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