Method for preparing anode material carbon coated lithium titanate for lithium ion power batteries

A carbon-coated lithium titanate, power battery technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of poor particle size electron conductivity, poor battery rate performance, etc., to improve electronic conductivity and power. performance, the effect of improving current density and power density

Inactive Publication Date: 2013-02-27
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcomings of the lithium titanate material prepared by the traditional solid phase method, such as large particle size and poor battery rate performance caused by poor electronic conductivity, and to provide a battery that can improve the battery rate performance, and the process is simple and suitable. Preparation method of carbon-coated lithium titanate material for large-scale production

Method used

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  • Method for preparing anode material carbon coated lithium titanate for lithium ion power batteries
  • Method for preparing anode material carbon coated lithium titanate for lithium ion power batteries
  • Method for preparing anode material carbon coated lithium titanate for lithium ion power batteries

Examples

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Embodiment 1

[0022] Example 1: Weigh 3.0g sucrose and 6.0g titanium dioxide respectively, place them in a 250mL beaker, add 80mL absolute ethanol, stir for 6h, and place them in an oven at 80℃ for drying; the dried sucrose and titanium dioxide mixture is Sintering in nitrogen at 600°C, holding time for 5 hours, and naturally lowering to room temperature, to obtain carbon-coated nano titanium dioxide; the mixture of lithium carbonate and lithium oxalate (the mass fraction of lithium oxalate is 1%) and titanium dioxide, according to Li :Ti=0.8:1 molar ratio for compounding, ball milling in acetone medium, drying, and sintering in nitrogen at 800°C for 10 hours to obtain carbon-coated lithium titanate powder.

Embodiment 2

[0023] Example 2: Weigh 0.6g sucrose and 2.0g titanium dioxide respectively, place them in a 250mL beaker, add 80mL absolute ethanol, stir for 6h, and place them in an oven at 80℃ for drying; the dried sucrose and titanium dioxide mixture is Sintering in nitrogen at 600°C, holding time for 5 hours, and naturally lowering to room temperature, to obtain carbon-coated nano titanium dioxide; the mixture of lithium carbonate and lithium oxalate (the mass fraction of lithium oxalate is 1%) and titanium dioxide, according to Li :Ti=0.8:1 molar ratio for compounding, ball milling in acetone medium, drying, and sintering in nitrogen at 800°C for 10 hours to obtain carbon-coated lithium titanate powder.

Embodiment 3

[0024] Example 3: Weigh 2.0g glucose and 4.0g titanium dioxide respectively, put them in a 150mL beaker, add 60mL absolute ethanol, stir for 6h, and place them in an oven at 80℃ for drying; the dried glucose and titanium dioxide mixture is Sintering in nitrogen at 600°C, holding time for 5 hours, and naturally lowering to room temperature to obtain carbon-coated nano titanium dioxide; the mixture of lithium acetate and lithium oxalate (the mass fraction of lithium oxalate is 1%) and titanium dioxide, according to Li :Ti=0.8:1 molar ratio for compounding, ball milling in acetone medium, drying, and sintering in nitrogen at 800°C for 10 hours to obtain carbon-coated lithium titanate powder.

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Abstract

The invention provides a method for preparing anode material carbon coated lithium titanate for lithium ion power batteries, and belongs to the technical field of electrochemical energy materials. According to the invention, titanium dioxides are coated with carbon firstly, and then technological processes of lithiation and calcining are performed, so that a carbon layer coated on the surface of the titanium dioxides both can effectively suppress the size increasing of particles in the process of sintering, and improves the electrical conductivity of lithium titanate materials; and in the process of lithiation, a small amount of lithium oxalate is added in lithium salts, thereby reducing the alkalinity of a solution, and facilitating the melting of TiO2/C. The invention aims to overcome the defects of poor battery rate performance difference and the like caused by the fact that lithium titanate materials prepared by using the traditional solid phase method is large in particle size and poor in electronic conductivity, and provides a method for preparing carbon coated lithium titanate materials which can improve the battery rate performance. The method is simple in process operation, and suitable for large-scale production.

Description

Technical field [0001] The invention relates to a preparation method of carbon-coated lithium titanate as a negative electrode material for a lithium ion power battery, and belongs to the technical field of electrochemical energy materials. Background technique [0002] Lithium titanate is a promising anode material for lithium-ion batteries. Compared with traditional carbon anode materials, lithium titanate has obvious advantages as anode materials for lithium-ion batteries: Li 4 Ti 5 O 12 It has an obvious charging and discharging platform, and there is an obvious voltage mutation at the end of charging and discharging, and has good overcharge resistance and overdischarge resistance; the voltage platform is located at 1.55V (vs.Li / Li + ) Nearby, it is not easy to cause metal lithium to precipitate or produce dendrites, and there is no thermal runaway and short circuit in the battery cell; during the charge and discharge cycle, the cell volume changes 0.1%-0.3%, which is called "z...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485
CPCY02E60/122Y02E60/10
Inventor 鄢俊敏张新波孟凡陆尹彦斌赵雪
Owner JILIN UNIV
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