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A polyaniline hollow microsphere/zinc composite positive electrode material and button lithium battery

A composite positive electrode material, polyaniline technology, applied in the direction of battery electrodes, secondary batteries, secondary battery manufacturing, etc., can solve the problems of performance degradation, volume expansion, low capacity, etc., to improve conductivity, reduce AC impedance, specific The effect of large surface area

Active Publication Date: 2018-06-29
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the defects of low capacity and performance degradation caused by volume expansion during lithium intercalation and deintercalation cycles in the lithium battery anode materials prepared by existing carbon-based anode materials, the purpose of the present invention is to provide a kind of lithium battery with large specific surface area and high conductivity. and polyaniline hollow microspheres / zinc composite cathode material with good stability

Method used

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  • A polyaniline hollow microsphere/zinc composite positive electrode material and button lithium battery
  • A polyaniline hollow microsphere/zinc composite positive electrode material and button lithium battery
  • A polyaniline hollow microsphere/zinc composite positive electrode material and button lithium battery

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Take 6.32g of absolute ethanol, 72.00g of water, and 2.08g of an aqueous solution containing poly(2-acrylamido-2-methylpropanesulfonic acid) (referred to as PAMPS, with a mass fraction of 20%) into a 250mL beaker, and stir well . Subsequently, 1.86 g of aniline was added to the above mixture, and after ultrasonication for 10 minutes, the temperature of the above mixture containing aniline was raised to 80° C., and magnetically stirred at this temperature for 10 minutes. Quickly add 40mL aqueous solution containing 4.56g of ammonium persulfate at 80°C to the above mixed solution containing aniline, and react at a constant temperature of 80°C for 60s under stirring conditions. Subsequently, the reaction system was placed in an ice-water bath at a temperature of 0-5° C. to continue the reaction for 12 h. The polyaniline hollow microspheres are obtained by using acetone to break the emulsion, washing with water and suction filtering. Microspherical zinc powder and polyani...

Embodiment 2

[0043] The polyaniline / zinc composite material that makes with embodiment 1 is used for the assembly of button type lithium battery:

[0044] Mix polyaniline hollow microspheres mixed with microspherical zinc powder, acetylene black, and polytetrafluoroethylene emulsion at a mass ratio of 80:10:10, add a small amount of absolute ethanol to adjust, and ultrasonicate for 10 minutes. Roll the ultrasonicated slurry into a thin sheet with a thickness of about 0.2mm, and press it on the nickel foam under an oil press. The pole piece was punched into a disc with a diameter of 15.0 mm using a die, and vacuum-dried at 70° C. for 12 hours to obtain a pole piece made of polyaniline material. Metal lithium sheets and polyaniline materials are used as the negative and positive electrodes of the battery respectively, with a separator in between, and 1mol / L LiPF 6 / EC+DMC as electrolyte, according to image 3 The form is assembled into a 2025-type button battery.

[0045] Figure 4 It sh...

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Abstract

The invention discloses a polyaniline hollow microsphere / zinc composite positive electrode material and a button-type lithium battery. The active material of the positive electrode material is polyaniline hollow microsphere mixed with microspherical zinc powder; the button-type lithium battery includes a positive electrode , negative electrode, diaphragm, electrolyte and shell, the positive electrode is made of active material, acetylene black and polytetrafluoroethylene emulsion positive electrode material; the positive electrode material of button lithium battery has large specific surface area, high conductivity and good stability; further preparation The lithium battery has low AC impedance, good cycle performance, and has broader application potential.

Description

technical field [0001] The invention relates to a button-type lithium battery prepared by using microspherical zinc powder mixed polyaniline hollow microspheres as the positive electrode active material and the positive electrode containing the microspherical zinc powder mixed state polyaniline hollow microsphere active material, belonging to the field of chemical power sources . Background technique [0002] Lithium batteries have the characteristics of high voltage, large specific energy, wide operating temperature, small volume and light weight, etc., and can be used in cardiac pacemakers, electronic watches, tape recorders, calculators, radio communication equipment and Submarines, torpedoes and other fields. The type of lithium battery is related to the positive electrode material. At present, the commonly used lithium battery electrode materials are mainly MnO 2 , SOCl 2 , SO 2 , S, C and CuO, etc. Among them, carbon-based materials have high intercalation densit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M10/0525H01M10/04H01M4/60H01M4/38
CPCH01M4/362H01M4/42H01M4/602H01M10/0427H01M10/0525Y02E60/10Y02P70/50
Inventor 李芝华李彦博
Owner CENT SOUTH UNIV
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