Method for preparing carbon nano tube doped lithium titanate composite electrode material

A technology of carbon nanotubes and composite electrodes, which is applied to battery electrodes, circuits, electrical components, etc., can solve the problems of long reaction time and high resource consumption, and achieve the effects of short reaction time, good material uniformity, and improved rate characteristics

Active Publication Date: 2011-05-25
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention utilizes the microwave method to prepare lithium titanate, and the purpose is to overcome the shortcoming of long reaction time and high resource consumption of the high-temperature solid-phase method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0018] Titanium dioxide and lithium carbonate were weighed according to the molar ratio of Ti:Li being 4:5, and the carbon nanotubes were weighed according to the ratio of lithium titanate to MWCNTs mass ratio of 95:5 (wherein lithium titanate was lithium carbonate and titanium dioxide mass and 84%). Then a small amount of alcohol was added, and the precursor was obtained by ball milling for 8 hours at a ball-to-material ratio of 50:1. After being air-dried, the flakes were pressed under a pressure of 30 MP, and then the flake precursors were placed in a ceramic crucible filled with carbon black, and the carbon black covered the precursors to prevent carbon nanotubes from being oxidized. The microwave frequency is 2455MHz, the power is 800W, and the sintering time is 6 minutes. After the composite material prepared is fully ground, 5% PVDF is used as binding agent, and NMP is used as dispersion agent, is coated on aluminum foil and makes electrode sheet (3.8g.cm -1 ), packag...

example 2

[0020] Titanium dioxide and lithium carbonate were weighed according to the molar ratio of Ti:Li being 4:5, and the carbon nanotubes were weighed according to the ratio of lithium titanate to MWCNTs mass ratio of 91:9 (wherein lithium titanate was lithium carbonate and titanium dioxide mass and 84%). Then a small amount of alcohol was added, and the precursor was obtained by ball milling for 8 hours at a ball-to-material ratio of 50:1. After being air-dried, the flakes were pressed under a pressure of 30 MP, and then the flake precursors were placed in a ceramic crucible filled with carbon black, and the carbon black covered the precursors to prevent carbon nanotubes from being oxidized. The microwave frequency is 2455MHz, the power is 700W, and the sintering time is 8 minutes. After the composite material prepared is fully ground, 5% PVDF is used as binding agent, and NMP is used as dispersion agent, is coated on aluminum foil and makes electrode sheet (3.8g.cm -1 ), packag...

example 3

[0022] Titanium dioxide and lithium carbonate were weighed according to the molar ratio of Ti:Li being 4:5, and the carbon nanotubes were weighed according to the ratio of lithium titanate to MWCNTs mass ratio of 90:10 (wherein lithium titanate was lithium carbonate and titanium dioxide mass and 84%). Then a small amount of alcohol was added, and the precursor was obtained by ball milling for 8 hours at a ball-to-material ratio of 50:1. After being air-dried, press the flake under 30MP pressure, then put the flake precursor in a ceramic crucible filled with carbon black, cover the precursor with carbon black to prevent the oxidation of carbon nanotubes, the microwave frequency is 2455MHz, the power is 640W, and the sintering time for 9 minutes. After the prepared composite material was fully ground, 5% PVDF was used as a binding agent, and NMP was used as a dispersant, and coated on an aluminum foil to obtain an electrode (3.8g.cm -1 ), packaged into a battery with a metal l...

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Abstract

The invention discloses a method for preparing a carbon nano tube doped lithium titanate composite electrode material. The composite material is prepared from lithium titanate and carbon nano tubes, wherein the mass ratio of lithium titanate to carbon nano tubes is 88-95:5-12. The method is characterized by taking lithium acetate or lithium carbonate, titanium dioxide and carbon nano tubes as rawmaterials and preparing the lithium titanate / carbon nano tube composite electrode material through ball mill and a microwave method. The lithium titanate composite electrode material has the characteristics of simple process, uniform material, small grain size, high specific capacity, high rate and the like.

Description

technical field [0001] The invention relates to a preparation method of a carbon nanotube-doped lithium titanate composite electrode material, which belongs to the field of new energy. technical background [0002] As a new type of energy storage material, the unique properties of lithium titanate and the simple synthesis method make it one of the ideal negative electrode materials in the field of new energy, especially in energy storage. The material is a "zero strain" material. During the charge and discharge process, the intercalation and deintercalation of lithium ions will not affect the change of the crystal structure, and it has good cycle performance. At present, power and energy storage batteries are expensive, and the rate and cycle life have always been difficult problems for lithium-ion batteries. How to simplify the preparation process of lithium titanate and improve its rate characteristics has become a hot spot of social research. At present, it is mainly pre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1391
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 张海燕童焰李娟
Owner GUANGDONG UNIV OF TECH
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