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Positive electrode, water system energy storage device comprising positive electrode, and preparation method of positive electrode

An energy storage device and positive electrode technology, which is applied in the direction of electrode manufacturing, active material electrode, secondary battery manufacturing, etc., can solve the problems of battery self-discharge, side reactions, etc., and achieve the effect of improving performance, simple industrialization, and good electrochemical performance

Inactive Publication Date: 2017-10-20
POSITEC POWER TOOLS (SUZHOU) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, one of the problems still to be solved in this type of energy storage device is the self-discharge of the battery due to the side reaction between the positive electrode and the electrolyte.

Method used

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  • Positive electrode, water system energy storage device comprising positive electrode, and preparation method of positive electrode
  • Positive electrode, water system energy storage device comprising positive electrode, and preparation method of positive electrode
  • Positive electrode, water system energy storage device comprising positive electrode, and preparation method of positive electrode

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preparation example Construction

[0046] There is no special limitation on the preparation method of graphene, for example, micromechanical exfoliation method, epitaxial growth method, chemical vapor deposition CVD method, graphene oxide reduction method, etc. can be used. Graphene oxide can be obtained by oxidizing graphite with a strong oxidant such as concentrated sulfuric acid, concentrated nitric acid, potassium permanganate, and the like. The reduced graphene oxide can be obtained by reducing the graphene oxide, and there is no special limitation on the reduction method, and hydrazine reduction method, sodium borohydride reduction method, 4C hydrothermal reduction method, etc. can be used.

[0047] As far as the horizontal direction is concerned, the graphene layer or the graphene derivative layer can be a continuous layer, or can be a plurality of overlapped or stacked layers. From the perspective of better realizing the effect of the present invention, preferably the graphene layer or graphene derivati...

Embodiment approach 1

[0066] A water system energy storage device, comprising a positive electrode, a negative electrode and an electrolyte, the positive electrode is as described above. The electrolytic solution is an aqueous solution, and the electrolytic solution also includes first metal ions and second metal ions. During the charging and discharging process of the battery, the first metal ion can be reversibly extracted-intercalated at the positive electrode, the second metal ion can be reduced and deposited as the second metal at the negative electrode, and the second metal can be reversibly oxidized and dissolved as the second metal ion.

[0067] The working principle of the battery is: when the battery is charged, the first metal ion is released from the positive electrode active material, and electrons are released; the electrons reach the negative electrode of the battery through an external circuit, and at the same time, the second metal ion in the electrolyte receives electrons on the nega...

Embodiment approach 2

[0086] In Embodiment 2, an aqueous energy storage device includes a positive electrode, a negative electrode, and an electrolyte, and the positive electrode is as described above.

[0087] The negative electrode may comprise any material capable of reversibly storing the first metal ion via surface adsorption / desorption (via electrochemical double-layer reaction and / or pseudocapacitive reaction (i.e., partial charge transfer surface interaction)), and has the desired Sufficient capacity over the voltage range. Exemplary materials meeting these requirements include: porous activated carbon, graphite, mesoporous carbon, carbon nanotubes, disordered carbon, Ti oxide (e.g., titanium dioxide) materials, V oxide materials, phosphoolivine materials, other suitable medium Porous ceramic materials and combinations thereof. In a preferred embodiment activated carbon is used as anode material.

[0088] The positive electrode provided by the present invention is coated with a graphene l...

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Abstract

The invention relates to a positive electrode comprising a graphene layer, and a water system energy storage device comprising the positive electrode. The positive electrode comprises a positive electrode current collector, a positive electrode active material layer formed on the positive electrode current collector, and a graphene layer or a graphene derivative layer formed on the positive electrode active material layer, wherein the positive electrode active material layer comprises a positive electrode active material, and metal ions can reversibly release from and embed into the positive electrode active material. The water system energy storage device comprising the positive electrode can obviously restrain side reactions of the positive electrode active material during charging, so that the performance of a secondary battery can be improved.

Description

technical field [0001] The invention belongs to the field of energy storage, and in particular relates to a positive pole and an energy storage device containing the positive pole. Background technique [0002] Lead-acid batteries, which have been around for more than a hundred years, have mature battery technology and occupy an absolute market share in energy storage fields such as car starter batteries, electric bicycles, and UPS. Although the lead-acid battery has a low cycle life and a relatively low energy density, it has the advantages of very low price and high cost performance. [0003] At present, there is an energy storage device, the working principle of which is: the positive electrode is based on the extraction-intercalation reaction of the first metal ion, the negative electrode is based on the deposition-dissolution reaction of the second metal ion, and the electrolyte contains the first metal ion that participates in the positive electrode extraction-intercal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/02H01M4/04H01M10/04
CPCH01M4/02H01M4/04H01M10/04Y02E60/10Y02P70/50
Inventor 阿里雷扎·泽哈塔卜·亚兹迪支键陈璞
Owner POSITEC POWER TOOLS (SUZHOU) CO LTD
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