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Preparation method of lithium titanate/carbon nano tube composite cathode material

A carbon nanotube composite and negative electrode material technology, which is applied in the direction of battery electrodes, electrical components, circuits, etc., can solve the problems of destroying the stable structure of lithium titanate, affecting battery cycle performance, and poor stability of negative electrode materials, so as to achieve high-rate discharge. ability, improve liquid absorption ability and cycle stability, and have good stability

Active Publication Date: 2013-05-01
RIGHTFUL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the reaction process of this method is complicated, and the stability of the negative electrode material obtained is poor. The oxidation step will destroy the stable structure of lithium titanate itself, and ultimately affect the cycle performance of the battery.

Method used

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  • Preparation method of lithium titanate/carbon nano tube composite cathode material
  • Preparation method of lithium titanate/carbon nano tube composite cathode material
  • Preparation method of lithium titanate/carbon nano tube composite cathode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] In this example, the lithium titanate / carbon nanotube composite negative electrode material is prepared by the following method, and the specific steps are:

[0026] (1) Preparation of lithium titanate powder: According to the molar ratio of lithium: titanium: dispersant = 1:1.2:5, take lithium carbonate, titanium dioxide and absolute ethanol, mix them evenly and add them to the planetary ball mill at a speed of 400 rpm / Wet ball milling for 48 hours to obtain a powder with a particle size of 2 μm. The powder was dried at a constant temperature of 100°C for 2 hours, and the dried powder was calcined at 800°C for 12 hours under the protection of argon, and the calcined powder was cooled. Take it out at 100°C, put it into an ultra-fine ball mill and mill it at a speed of 1000 rpm for 120 minutes to obtain lithium titanate powder with a particle size of 1 μm;

[0027] (2) Add an iron catalyst with a particle size of 50 nm to the lithium titanate powder with a particle size...

Embodiment 2

[0030] In this example, the lithium titanate / carbon nanotube composite negative electrode material is prepared by the following method, and the specific steps are:

[0031] (1) Preparation of lithium titanate powder: Take lithium nitrate, titanium dioxide and absolute ethanol according to the molar ratio of lithium: titanium: dispersant = 1:2:3, mix them evenly and add them to the planetary ball mill at a speed of 400 rpm / Wet ball milling at a rotating speed of 48 hours to obtain a powder with a particle size of 5 μm. The powder was dried at a constant temperature of 100 ° C for 3 hours, and the dried powder was calcined at 1000 ° C for 24 hours under the protection of nitrogen. The calcined powder was cooled to Take it out at 100°C, then put it into an ultra-fine ball mill and mill it at a speed of 2000 rpm for 300 minutes to obtain lithium titanate powder with a particle size of 3 μm;

[0032] (2) Add a cobalt catalyst with a particle size of 100 nm to the lithium titanate ...

Embodiment 3

[0035] In this example, the lithium titanate / carbon nanotube composite negative electrode material is prepared by the following method, and the specific steps are:

[0036](1) Preparation of lithium titanate powder: According to the molar ratio of lithium: titanium: dispersant = 1:2:8, take lithium acetate, titanium dioxide and absolute ethanol, mix them evenly and add them to the planetary ball mill at a speed of 400 rpm / Wet ball milling at a rotating speed of 48 hours to obtain a powder with a particle size of 0.5 μm. The powder was dried at a constant temperature of 100°C for 4 hours, and the dried powder was calcined at 600°C for 48 hours under the protection of helium. The calcined powder Cool to 100°C and take it out, then put it into an ultra-fine ball mill and mill at a speed of 1500 rpm for 200 minutes to obtain lithium titanate powder with a particle size of 0.3 μm;

[0037] (2) Add a nickel catalyst with a particle size of 30 nm to the lithium titanate powder with ...

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Abstract

The invention discloses a preparation method of a lithium titanate / carbon nano tube composite cathode material and belongs to the technical field of battery materials. A carbon nano tube grows on the surface of lithium titanate by a chemical vapour deposition method, and has the characteristics of uniform dispersion, high binding force and the like compared with a carbon nano tube directly doped in lithium titanate, the growing carbon nano tube can form a network structure on the surface of lithium titanate, and an important effect is exerted on improving structural stability of the material under the condition of high-rate discharge of a battery. The contact probability of the lithium ion battery with lithium titanate is increased and the internal resistance and polarization are reduced by using high conductivity of the carbon nano tube and the network structure formed by the carbon nano tube, the liquid absorption and keeping ability of the cathode material can be improved due to larger specific surface area of the carbon nano tube, and the high-rate discharge ability and recyclability of the battery are improved.

Description

technical field [0001] The invention relates to a preparation method of a lithium ion battery negative electrode material, in particular to a preparation method of a lithium titanate / carbon nanotube composite negative electrode material, which belongs to the technical field of battery materials. Background technique [0002] Lithium-ion battery is a new type of energy storage battery developed in recent years. It has attracted people's attention for its advantages of long cycle life, stable working voltage platform, low price and no pollution. It has been widely used in electric vehicles, wind energy storage, etc. Energy, mobile power station and other fields. [0003] At present, graphite-based materials are mostly used for the negative electrodes of lithium-ion batteries, but the defects of graphite-based negative electrode materials, such as poor cycle life and low safety, limit their wide application in the battery field. Spinel-type lithium titanate is a zero-strain ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485
CPCY02E60/122Y02E60/10
Inventor 程先桃
Owner RIGHTFUL TECH
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