Polyanion composite material, its preparation method and application

A composite material, polyanion technology, applied in electrical components, electrochemical generators, battery electrodes, etc., can solve the problems of low electronic and ionic conductivity, cannot improve the rate performance and cycle performance of materials at the same time, and improve the electronic conductivity. efficiency, improve interface stability, and achieve the effect of simple methods

Active Publication Date: 2014-02-05
INST OF PHYSICS - CHINESE ACAD OF SCI
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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 existing LiFePO 4 When the polyanion materials are used as the positive electrode material of the secondary lithium battery, the electron and ion conductivity are low, and the current existing technical methods cannot improve the rate performance and cycle performance of the material at the same time, thereby providing a polyanion composite material, The composite material is formed by introducing a highly conductive compound containing boron carbon or carbon nitrogen or boron carbon nitrogen to form B x C y N z -Li a D' b m c D'' d XO e A f Composite materials to greatly improve the rate performance and cycle performance of materials

Method used

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  • Polyanion composite material, its preparation method and application
  • Polyanion composite material, its preparation method and application
  • Polyanion composite material, its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0083] In a dry atmosphere, the carbon-nitrogen-containing ionic liquid [EMIm][N(CN) 2 ]0.3g add 1gLiFePO 4 powder and shake in a shaker mixer for 30 minutes to obtain a gritty mixture. Transfer this mixture to an alumina crucible and place in a tube furnace with argon or nitrogen. Raise the temperature from room temperature to 600°C at a rate of 2°C / min, and keep at 600°C for 2 hours to fully crack the ionic liquid. After the tube furnace cools down, take out the sample and grind it into a black powder, which is the composite material of the present invention. Wherein, the weight percent content of nitrogen in the carbonitride compound is about 28%, and the weight percent content of the carbonitride compound in the composite material is about 5%.

[0084] Make samples to simulate batteries. LiFePO before and after coating 4 : Acetylene black: PVdF binding agent=85%: 10%: 5% ratio is mixed under normal temperature and pressure to form slurry, evenly coated on the aluminum ...

Embodiment 2-3

[0086] Prepare the polyanion composite material for secondary lithium battery of the present invention that forms by the method for embodiment 1 by table 1, difference is, the content of ionic liquid and active material is not the same, obtains different carbonitride weight percents The content of composite materials is about 2% and 12%, respectively.

[0087] The assembly of the positive electrode, negative electrode, electrolyte and battery of the simulated battery is the same as in Example 1, and the test results are listed in Table 1.

Embodiment 4-5

[0089] The method for preparing by the embodiment 1 is used for the polyanion composite material of the present invention of the composition of table 1, and difference is, heat treatment temperature is not the same, obtains the weight percent content of different nitrogen in carbonitride The composite materials are about 38% and 7%, respectively.

[0090] The assembly of the positive electrode, negative electrode, electrolyte and battery of the simulated battery is the same as in Example 1, and the test results are listed in Table 1.

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Abstract

The invention relates to a polyanion composite material, which has a general formula of BxCyNz-LiaD' bMcD'' dXOeAf, with BxCyNz as a compound of boron and carbon, or carbon and nitrogen, or boron, carbon and nitrogen. The invention provides a preparation method of the composite material and its application. The invention also provides a positive electrode with the composite material of the invention and a lithium battery containing the positive electrode. The composite material provided in the invention has high electronic conductivity and ionic conductivity, especially has an excellent rate performance and good cycle stability.

Description

technical field [0001] The present invention relates to a polyanion composite material and its preparation method and application. Specifically, the present invention relates to a polyanion composite material containing boron carbon or carbon nitrogen or boron carbon nitrogen compound and its preparation method and application. Background technique [0002] Lithium-ion batteries are currently widely used in various portable devices, and have been used in small batches in electric vehicles and energy storage battery packs. These applications also have higher and higher requirements for the performance of lithium-ion batteries, such as high energy Density, high power density, rate performance, cycle stability, safety, etc. At present, the positive electrode material used in commercial batteries is mainly LiCoO 2 , LiMn 2 o 4 etc., the negative electrode is mainly graphite-like carbon material. LiFePO with olivine type (Olivine) discovered by Goodenough et al. in 1997 4 As...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58H01M4/62H01M4/136H01M4/1397H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 胡勇胜李泓王兆翔黄学杰陈立泉
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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