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Electrode composite material and preparation method thereof, positive electrode, and battery having positive electrode

A composite material and electrode technology, which is applied in the field of electrode composite material preparation, can solve problems such as poor conductivity and affect battery cycle performance, and achieve the effects of good resistance to volume change, excellent conductivity and cycle stability, and a simple preparation method.

Inactive Publication Date: 2014-04-09
POSITEC POWER TOOLS (SUZHOU) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] First of all, the conductivity of elemental sulfur and sulfide itself is very poor, and a large amount of conductive agent needs to be added to increase its conductivity; secondly, when elemental sulfur is used as the positive electrode active material, although the elemental sulfur present on the positive electrode when fully charged and fully discharged Li that exists 2 S is insoluble in polar organic electrolytes, but lithium polysulfides present in the positive electrode of some charging and discharging are easily soluble in polar organic electrolytes. In addition, the small molecular sulfides produced during discharge of polyorganosulfides are also easily soluble in organic electrolytes, affecting the battery. cycle performance

Method used

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  • Electrode composite material and preparation method thereof, positive electrode, and battery having positive electrode
  • Electrode composite material and preparation method thereof, positive electrode, and battery having positive electrode
  • Electrode composite material and preparation method thereof, positive electrode, and battery having positive electrode

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Embodiment approach

[0091] In a preferred embodiment, in the electrode composite material, the mass ratio of polyacrylonitrile PAN to reduced graphene oxide RGO is 13:1-25:1.

[0092] In another preferred embodiment, in the electrode composite material, the mass ratio of polyacrylonitrile PAN to reduced graphene oxide RGO is 26:1-44:1.

[0093] In the electrode composite material provided by the present invention, the conductive polymer, GNS or RGO is introduced into the elemental sulfur, so that the electrode composite material has excellent electrical conductivity. In addition, GNS or RGO as a substrate provides an effective electron conduction path for S and Stable structure, this kind of stable structure can make the electrode composite material can well bear the volume change in the charging and discharging process, so that the electrical conductivity and cycle stability of the electrode composite material can be improved. The layered structure of the electrode composite material, the conduc...

Embodiment 1

[0151] Grind 1 g of graphite with 50 g of sodium chloride in an agate mortar for 10 minutes to remove contaminants on the graphite and grind it finely. Then the mixture of graphite and sodium chloride was washed several times with distilled water, and vacuum filtered to remove sodium chloride, the filter membrane pore size was 0.2 micron. After filtering, put the graphite into a vacuum drying oven and dry it at 70°C for 20 minutes to remove the remaining moisture. After drying, the resulting solid was mixed with 23 ml of concentrated sulfuric acid in a 250 ml round bottom flask and stirred continuously at 25°C for 24 hours. Add 100 mg of sodium nitrate to the above dispersion and stir for 5 min to dissolve it. Then, place the flask in an ice bath, keep the temperature below 20°C, add 3g of potassium permanganate to the suspension, then heat it to 40°C, keep it for 30min, add 3ml of ultrapure water, and after 5min, add 3ml of ultrapure water Pure water, after another 5 minute...

Embodiment 2

[0158] By chemical oxidation process, with FeCl 3 As an initiator, polypyrrole was synthesized from pyrrole monomer (Aldrich, purity 98%). Polypyrrole-attached graphene (Ppy / GNS) was prepared by in situ polymerization of pyrrole on graphene. First, 0.1 g of graphene (US research nano-materials Inc) was dispersed in 40 mL of a mixed solvent of methanol and acetonitrile (volume ratio 1:1) by a sonicator (Fisher Scientific, FB120) at room temperature, and sonicated for 2 h. Add 0.2g pyrrole to the solution, stir for 0.5h, then add 15mL, 0.5mol / L FeCl 3 Added dropwise to the above solution, and continued to sonicate at room temperature, separated by filtration to obtain Ppy / GNS, then thoroughly washed with deionized water and ethanol, and dried overnight at 70°C in a vacuum environment.

[0159] The prepared Ppy / GNS was added to a suspension containing 6g of nano-sulfur (US research nano-materials Inc, 10wt%), sonicated by an ultrasonic instrument for 0.5h to make the mixture un...

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Abstract

The present invention relates to an electrode composite material, which contains elemental sulfur, a conductive polymer and graphene or a reduced graphene oxide, and has a layered structure, wherein the graphene or the reduced graphene oxide adopted as a substrate provides an effective electron conduction network and a stable structure for the electrode composite material, such that the electrode composite material has characteristics of good cycle life, good rate performance and high discharge capacity. The present invention further discloses a preparation method for the electrode composite material, a positive electrode applying the electrode composite material, and a battery having the positive electrode.

Description

technical field [0001] The invention relates to an electrode composite material. [0002] The invention also relates to a preparation method of the electrode composite material. [0003] The invention also relates to a positive electrode with the electrode composite material. [0004] The invention also relates to a battery with the positive electrode. Background technique [0005] In recent years, with the development of science and technology, the demand for energy, especially renewable green energy, has become more and more prominent. As an energy storage and conversion device, batteries are playing an irreplaceable role. Lithium-ion batteries have attracted extensive attention due to their high mass-specific energy and volume-specific energy. Low cost, high energy density, long cycle life, and green secondary batteries are the focus of lithium-ion battery development at present. [0006] The current commercial positive electrode materials are mainly layered or spinel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36
CPCH01M4/36H01M4/13H01M4/366H01M4/625H01M4/38H01M4/5815H01M4/587H01M4/602Y02E60/10
Inventor 陈璞张永光李晶
Owner POSITEC POWER TOOLS (SUZHOU) CO LTD