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Carbon negative electrode material of lithium ion cell, its preparation method and application

A technology for lithium ion batteries and negative electrode materials, which is applied in electrode manufacturing, battery electrodes, circuits, etc., can solve the problems of low first charge and discharge efficiency, poor cycle performance, etc., to improve the first charge and discharge efficiency, reduce the degree of anisotropy, Reduce the effect of selectivity

Inactive Publication Date: 2003-04-23
INST OF CHEM 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 the shortcomings of low initial charge and discharge efficiency, poor cycle performance, and high selectivity to electrolytes that exist in existing graphite negative electrode materials, and provide lithium-ion battery carbon negative electrode materials and their materials coated with graphite by polymer solid electrolytes. Preparation method and application

Method used

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  • Carbon negative electrode material of lithium ion cell, its preparation method and application
  • Carbon negative electrode material of lithium ion cell, its preparation method and application
  • Carbon negative electrode material of lithium ion cell, its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Take by weighing 20 grams of natural graphite and add the concentration to be 20% HClO 4 Fully stirred for 5 hours, the reaction temperature was 45°C, and then filtered and dried. Add 0.25 gram polystyrene sulfonate lithium (molecular weight 6500) in natural graphite after above-mentioned treatment, 34 milliliters of methanol solvents are made dispersion medium, transfer in the radiant tube after fully stirring, obtain surface adsorption has polystyrene sulfonate lithium graphite material. The above-mentioned graphite material was placed in a cobalt 60-γ-ray radiation source for cross-linking polymerization, the reaction time was 16 hours, the dose was 1.6 million rad, and the dose rate was 100,000 rad / h. Afterwards, it was washed three times with anhydrous methanol to obtain a polymer solid electrolyte-coated graphite material. The above materials were made into electrode sheets with a thickness of 0.1-0.2 mm and assembled into batteries to perform charge and dischar...

Embodiment 2

[0023] Weigh 20 grams of natural graphite and add a concentration of 30% H 2 SO 4 Fully stirred for 10 hours, the reaction temperature was 35°C, and then filtered and dried. Add 0.15 gram polystyrene sulfonate lithium (molecular weight 4000) in natural graphite after above-mentioned treatment, 34 milliliters of ethanol solvents are made dispersion medium, transfer in the radiant tube after fully stirring, obtain surface adsorption has polystyrene sulfonate lithium graphite material. The above-mentioned graphite material was placed in an electron accelerator for cross-linking polymerization, the reaction time was 20 hours, the dose was 2.4 million rad, and the dose rate was 120,000 rad / h. Afterwards, it was washed three times with anhydrous methanol to obtain a polymer solid electrolyte-coated graphite material. The above materials were made into electrode sheets with a thickness of 0.1-0.2 mm and assembled into batteries to perform charge and discharge performance tests.

Embodiment 3

[0025] Weigh 20 grams of natural graphite and add concentration of 40% HNO 3 Fully stir in the medium for 8 hours, the reaction temperature is 50°C, and then filter and dry. Add 0.20 grams of methacrylate oxide ethylene ester and lithium methacrylate monomer with a weight ratio of 1:0.5 to the natural graphite after the above treatment, and 34 milliliters of a volume ratio of 1:0.6 water / ethanol solution as a dispersion medium, transfer after fully stirring In the radiant tube, a graphite material with monomers adsorbed on the surface is obtained. The above-mentioned graphite material was placed in a cobalt 60-γ-ray radiation source for copolymerization reaction, the reaction time was 16 hours, the dose was 3.2 million rad, and the dose rate was 200,000 rad / h. Afterwards, it was washed three times with anhydrous methanol to obtain a polymer solid electrolyte-coated graphite material. The above materials were made into electrode sheets with a thickness of 0.1-0.2 mm and assem...

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Abstract

The present invention discloses a carbon negative electrode material of lithium ion cell, and is characterized by that it uses natural graphite as raw material, a layer of monomer of polymer is adsorbed on the surface of natural graphite by means of dipping process, then radiation method is adopted to make polymerization or cross-linking reaction, so that the surface of the natural graphite is covered with a layer of high-molecular solid electrolyte. Said invention also discloses its preparation method and application as working electrode of lithium ion cell.

Description

Technical field: [0001] The invention relates to a lithium ion battery carbon negative electrode material, in particular to a graphite electrode material, and also relates to a preparation method and application thereof. Background technique: [0002] Lithium-ion battery is a new green chemical power source. Compared with traditional nickel-cadmium batteries and nickel-metal hydride batteries, it has the advantages of high voltage, long life and high energy density. Since Japan's Sony Corporation launched the first generation of lithium-ion batteries in 1990, it has developed rapidly and is widely used in various portable devices. [0003] As a negative electrode material for lithium-ion batteries, natural graphite has the advantages of high capacity, low price, and abundant sources, but it also has the disadvantages of low initial charge and discharge efficiency, poor cycle performance, and high selectivity to electrolyte; thus limiting its use in lithium-ion batteries. Wi...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M4/60
CPCY02E60/12Y02E60/10
Inventor 潘钦敏方世壁
Owner INST OF CHEM CHINESE ACAD OF SCI
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