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Lithium ion battery conducting material and preparation method and application thereof

A lithium-ion battery and conductive material technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problem of no lithium-ion battery negative electrode materials, etc., and achieve the effects of low cost, simple process, and low energy consumption

Inactive Publication Date: 2010-06-09
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] At present, there is no literature report on the use of graphene as a conductive material to construct lithium-ion battery anode materials

Method used

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  • Lithium ion battery conducting material and preparation method and application thereof
  • Lithium ion battery conducting material and preparation method and application thereof
  • Lithium ion battery conducting material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A: Weigh 5.5g of artificial graphite (the anode material of lithium-ion batteries for industrial use, the particle distribution is 10-15μm, and the specific surface area is 4m 2 / g, the ash content is 4-6%), added to the mixture of 95mL concentrated sulfuric acid (concentration 98%) and 47.5mL concentrated nitric acid (concentration 65-67%) at 0-4°C, and then added 5 1 gram of potassium chlorate, 55 grams in total, the reaction temperature is controlled at 0-4°C, after 90 hours of continuous reaction, first rinse with 0.1mol / L dilute hydrochloric acid and then with deionized water until no chlorine ions are detected and the pH value reaches neutral . Graphite oxide powder was obtained after vacuum drying at 40°C.

[0024] B: put the graphite oxide powder into the crucible and put it into a muffle furnace with an air atmosphere at 1000°C for rapid heat treatment for 20 seconds (that is, leave it for 20 seconds) to obtain exfoliatable graphite.

[0025] C: Using an ultr...

Embodiment 2

[0028] The preparation method of graphite oxide powder is the same as in Example 1. Put the graphite oxide powder obtained in step A into a crucible and put it into a muffle furnace with an air atmosphere at 1000°C for rapid heat treatment for 10 seconds to obtain peelable graphite. Use a probe ultrasonic cell pulverizer Under 400W power, in ethanol solvent, disperse for 4 hours to obtain graphene suspension, and vacuum dry at 40°C to obtain graphene conductive agent. The prepared graphene nanosheets have a thickness of 5-10nm and an area of ​​2-4μm 2 . The tap density is 0.74~0.78g / cm 3 , the conductivity at room temperature is 900~950S cm -1

[0029] The preparation of the electrode sheets, the assembly and testing of the simulated battery are the same as in Example 1. Measured at a current density of 0.2mA / cm 2 When the discharge capacity is 294mAh / g.

Embodiment 3

[0031] The preparation method of graphene conductive agent is the same as in Example 1 except that the oxidation reaction time of step A is 72 hours, and the thickness of the prepared graphene nanosheets is 7-9 nm, and the area is 1-5 μm 2 . The tap density is 0.76~0.77g / cm 3 , the conductivity at room temperature is 950~1150S cm -1 .

[0032] The preparation of the electrode sheets, the assembly and testing of the simulated battery are the same as in Example 1. Measured at a current density of 0.2mA / cm 2 When the discharge capacity is 297mAh / g.

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Abstract

The invention relates to a lithium ion battery conducting material and a preparation method and application thereof. A graphene lithium ion battery conducting material is prepared by adopting a graphite oxide rapid heat expansion method and has high aspect ratio, which is beneficial to shortening the migration distance of lithium ions and improving the wetting quality of an electrolyte, thereby, the rate performance of an electrode is improved; the graphene lithium ion battery conducting material also has high conductivity and can ensure that an electrode active substance has higher utilization ratio and excellent cyclical stability. Compared with a common acetylene black conductive agent under the same using amount, the specific capacity of a lithium ion battery cathode constructed by the conducting material is improved by 25-40 percent, and the coulomb efficiency is improved by 10-15 percent. In addition, the method has low cost, simple process, high security and low energy consumption and is suitable for large-scale production.

Description

Technical field: [0001] The invention relates to a lithium-ion battery conductive material and its preparation method and application, that is, the lithium-ion battery conductive material is used for electrode preparation. Background technique: [0002] Lithium-ion battery is a new type of energy storage device, which has the characteristics of high energy density, high average output voltage, small self-discharge, large output power, fast charge and discharge, wide operating temperature range, environmental friendliness, and long service life. Due to the above advantages, since the commercial application of Sony Corporation in 1992, it has attracted the attention of scientific research institutions and governments all over the world, and has been widely used in portable electronic products such as notebook computers, mobile phones, and digital cameras. In addition, military, aerospace Lithium-ion batteries used in fields such as electric vehicles and electric vehicles are a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/139
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 宋怀河郭鹏陈晓红
Owner BEIJING UNIV OF CHEM TECH
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