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Spinel composite material, preparation method and application thereof

A composite material and spinel technology, applied in the field of spinel composite materials and its preparation, can solve the problems of not being able to simultaneously improve the material rate performance and cycle performance, and low electronic conductivity and ion conductivity

Inactive Publication Date: 2012-01-11
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the invention is: in order to overcome existing Li 4 Ti 5 o 12 When spinel materials are used as secondary lithium batteries and electrochemical supercapacitor electrode materials, the electronic conductivity and ion conductivity are low, and the current existing technical methods cannot simultaneously improve the rate performance and cycle performance of the material. The present invention Provide a spinel composite material, which greatly improves the rate performance and cycle performance of the material by introducing a highly conductive compound containing carbon and nitrogen

Method used

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  • Spinel composite material, preparation method and application thereof
  • Spinel composite material, preparation method and application thereof
  • Spinel composite material, preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0091] This embodiment is used to illustrate the composite material provided by the present invention and its preparation method (coating method).

[0092] In a dry atmosphere, 320 μL ionic liquid [EMIm][N(CN) 2 ] Add 1 g porous Li 4 Ti 5 o 12 powder, shaken in a vortex mixer at 2000rpm for 10 minutes to obtain a white sandy 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 percentage of nitrogen in CxNy is about 30%, and the weight percentage of CxNy in the composite material is about 6%.

Embodiment 2-3

[0094] This embodiment is used to illustrate the composite material provided by the present invention and its preparation method (coating method).

[0095] The method for preparing by the embodiment 1 is used for the composite material of the present invention of the composition of table 1 and is used for secondary lithium battery, difference is, the content of ionic liquid and active material is not the same, obtains the composite material of different CxNy weight percentages, respectively 3% and 10%.

[0096] The assembly of positive pole, negative pole, electrolyte and battery of simulation battery is the same as embodiment 1, and its test result is listed in table 1, and its charge-discharge curve is listed in respectively figure 1 and figure 2 .

Embodiment 4-5

[0098] This embodiment is used to illustrate the composite material provided by the present invention and its preparation method (coating method).

[0099] The method for preparing by the embodiment 1 is used for the composite material of the present invention of the composition of table 1 and is used for secondary lithium battery, and difference is, heat treatment temperature is not the same, obtains the composite material of different nitrogen by weight percentage in CxNy, respectively 40% and 8% or so.

[0100] 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 spinel composite material, a preparation method and application thereof. The composite material provided by the invention has a general formula of CxNy-(LaM'b)4(McM''d)5O12-eAf, wherein the CxNy is a compound containing carbon and nitrogen. The invention also provides a preparation method and application of the composite material. The invention also provides a cathode comprising the composite material of the invention, and a lithium battery and an electrochemical supercapacitor comprising the cathode. The composition material of the invention has high electronic conductivity and ionic conductivity, particularly high multiplying performance and high cyclical stability.

Description

technical field [0001] The present invention relates to a spinel composite material and its preparation method and application. Specifically, the present invention relates to a spinel composite material containing carbon and nitrogen compounds as well as 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 commercially available batteries is mainly LiCoO 2 , LiMn 2 o 4 etc., the negative electrode material is mainly graphite-like carbon material. In recent years, spinel Li 4 Ti 5 o 12 As an anode material, it has aroused great interest ...

Claims

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Application Information

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IPC IPC(8): H01M4/525H01M4/62H01M10/052
CPCY02E60/122Y02E60/10
Inventor 胡勇胜赵亮李泓王兆翔黄学杰陈立泉
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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