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Preparation and application of positive electrode material of chargeable and dischargeable lithium ion battery

A technology of lithium ion battery and positive electrode material, which is applied in the field of preparation and application of positive electrode material of rechargeable and dischargeable lithium ion battery, and can solve the problems of limiting the application of fluorinated carbon materials and not having rechargeable and discharging properties.

Active Publication Date: 2021-09-21
UNIV OF ELECTRONIC SCI & TECH OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, at present, researchers have only found that fluorinated carbon has obvious secondary behavior in sodium and potassium batteries as anode materials, but it does not have chargeable and dischargeable properties in conventional lithium batteries, which also severely limits the use of fluorinated carbon materials. Application in secondary battery market

Method used

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  • Preparation and application of positive electrode material of chargeable and dischargeable lithium ion battery
  • Preparation and application of positive electrode material of chargeable and dischargeable lithium ion battery
  • Preparation and application of positive electrode material of chargeable and dischargeable lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Add 3 parts by weight of polyacrylonitrile powder to 50 parts by weight of dimethylformamide and stir at room temperature (25°C, the same below) to fully obtain a clear dispersion, then add 7 parts by weight of graphite fluoride powder Add 1 weight part of lithium carbonate to the above dispersion liquid and stir at 90°C with a stirring speed of 500r / min to fully obtain a slurry, and spray the obtained slurry to obtain uniformly dispersed particles. The inlet temperature of the spray chamber is 190°C , and then calcined the obtained particles in an argon atmosphere at 600° C. for 4 hours to obtain a carbon fluoride / polyacrylonitrile composite material.

[0042] The XRD figure of the carbon fluoride / polyacrylonitrile composite material prepared in this embodiment is as follows figure 1 shown, from figure 1 It can be seen that no diffraction peak of polyacrylonitrile is found at 16.8° in the XRD diagram, indicating that polyacrylonitrile has become an amorphous phase whe...

Embodiment 2

[0059] The mass ratio of graphite fluoride powder and polyacrylonitrile powder in Example 1 is adjusted to 5:5, and other preparation conditions remain unchanged; the prepared carbon fluoride / polyacrylonitrile composite material is prepared into a positive electrode sheet and assembled into a battery, and test the charge and discharge performance of the obtained battery with a battery test system, the preparation, assembly and test methods are the same as in Example 1.

[0060] The charge-discharge performance test result of the assembled battery of embodiment 2 is as follows Figure 9 shown, from Figure 9 It can be seen from the results that the battery assembled with the composite material prepared in this example has a discharge specific capacity of only 497.1mAh / g in the first cycle of the charge and discharge test, although the discharge specific capacity of the second cycle reaches 331.6mAh / g, which is higher than that prepared in Example 1. The discharge specific capa...

Embodiment 3

[0066] Polymer is changed into polypyrrole in embodiment 1:

[0067] Add 5 parts by weight of pyrrole monomer and 5 parts by weight of carbon fluoride into 50 parts by weight of deionized water and stir at room temperature to obtain a dispersion, slowly add ferric chloride solution dropwise to the dispersion, and The reaction was stirred for 12 hours, and the stirring temperature was controlled at 2°C; finally, the obtained reaction system was filtered, washed, and dried in a vacuum environment at a drying temperature of 60°C and a drying time of 12 hours to obtain a carbon fluoride / polypyrrole composite material.

[0068] The carbon fluoride / polypyrrole composite material prepared in this example was prepared into a positive electrode sheet and assembled into a battery, and the charge and discharge performance of the obtained battery was tested with a battery test system. The preparation, assembly methods and test methods were the same as in Example 1. The test results of cha...

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Abstract

The invention belongs to the technical field of lithium battery materials, and particularly relates to preparation and an application of a positive electrode material of a chargeable and dischargeable lithium ion battery. The preparation method comprises the following steps: fully mixing carbon fluoride, a calcined nitrogen-containing polymer with a ring structure and a lithium salt, and carrying out a calcination reaction in a protective atmosphere; or fully mixing the carbon fluoride, the nitrogen-containing monomer with the ring structure and the lithium salt, and then carrying out polymerization reaction.

Description

technical field [0001] The invention belongs to the technical field of lithium battery materials, and in particular relates to the preparation and application of a rechargeable and dischargeable lithium ion battery cathode material. Background technique [0002] With the continuous development of electric vehicles and large energy storage devices, lithium-ion batteries with high energy density and high power density are indispensable. In lithium batteries, the carbon fluoride system is 2180Wh kg -1 , exceeding SOCl 2 , MnO 2 , SO 2 The battery system is the highest among known lithium batteries. Fluorinated carbon cathodes generally have the advantages of stable working voltage, wide operating temperature range, low self-discharge rate, and long service life. Therefore, fluorocarbons are of great interest as high-energy storage devices in medical implants, electronics, and military fields. [0003] However, for fluorinated carbon cathode systems, the strong C–F bond co...

Claims

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Application Information

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IPC IPC(8): H01M4/04H01M4/36H01M10/0525H01M10/42
CPCH01M4/0402H01M4/362H01M10/4235H01M10/0525Y02E60/10
Inventor 王丽平陈施颖
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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