Positive electrode, and battery containing same

A positive electrode, battery technology, applied to the positive electrode. It can solve the problems of limiting the battery and the deterioration of the electrochemical performance of the battery, and achieve the effects of improving the floating charge life, good battery performance consistency, and simple preparation process.

Inactive Publication Date: 2016-07-27
POSITEC POWER TOOLS (SUZHOU) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, at present, the self-discharge problem of this type of battery is relatively serious, which will lead to rapid deterioration of the electrochemical performance of the battery and limit the practical application of this type of battery. Therefore, it is urgent to find a new ion exchange battery that can improve the self-discharge problem of the battery.

Method used

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  • Positive electrode, and battery containing same
  • Positive electrode, and battery containing same

Examples

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Effect test

preparation example Construction

[0084] The preparation method of the positive electrode sheet is not particularly limited. In a specific embodiment, the slurry containing the positive electrode active material is first prepared, and then the slurry is formed on the second carrier, and the positive electrode active material is formed on the second carrier by drawing the slurry.

[0085] The second carrier mainly plays the role of carrying the positive electrode active material, and the second carrier itself is electrochemically inert. According to those skilled in the art, electrochemical inertness means that the second carrier does not participate in any electrochemical reaction and exists stably in the positive electrode sheet. It exists as a matrix that supports the active material layer.

[0086] In a specific embodiment, the second carrier is electronically insulated and has a porous structure. Specifically, the pore size of the second carrier ranges from 50 mesh to 200 mesh. In this way, on the premise o...

Embodiment 1

[0144] Preparation of positive electrode: Lithium manganate LMO, conductive agent graphite KS15, binder styrene-butadiene rubber (SBR) and sodium carboxymethyl cellulose (CMC) according to the mass ratio LMO:CMC:SBR:graphite=86.5:1:2.5: 10 mixed in water to form a homogeneous cathode slurry. Fully immerse the nylon mesh in the positive electrode slurry, then pull the nylon mesh with the positive electrode slurry out of the positive electrode slurry tank, and scrape off the excess slurry on the positive electrode collector according to the predetermined thickness with a scraper, so as to realize the control of the positive electrode collector. The thickness of the positive electrode slurry on the fluid, and make the slurry on the surface of the positive electrode current collector more uniform. Dry the positive electrode current collector with the positive electrode slurry at 60°C to form an active material layer, and then press it into a sheet and cut it into a size of 8×10cm ...

Embodiment 2

[0152] In embodiment 2, lithium manganate LMO, conductive agent graphite KS15, binder styrene-butadiene rubber (SBR) and sodium carboxymethyl cellulose (CMC) are according to mass ratio LMO:CMC:SBR:graphite=84.5:1 :2.5:12 Mix in water to form a uniform positive electrode slurry. The rest of the composition and preparation method of the positive electrode sheet are the same as in Example 1.

[0153] The rest of the composition and preparation method of the battery are the same as in Example 1.

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Abstract

The invention provides a positive electrode, comprising a positive plate, a positive current collector and a bonding layer arranged between the positive plate and the positive current collector, wherein the positive plate comprises a positive electrode active substance capable of realizing reversible deintercalation-intercalation of a first metal ion, and the bonding layer comprises a binder and a conductive agent. The positive electrode provided by the invention has good corrosion resistance and high consistency. The invention also provides a battery containing the positive electrode. According to the battery provided by the invention, the problem of corrosion of the conductive agent in the positive electrode can be improved, so the problem of self-discharging of the battery is further improved and the electrochemical performance of the battery is improved.

Description

technical field [0001] The invention belongs to the field of batteries, and in particular relates to a positive electrode. [0002] The invention also relates to batteries containing such positive electrodes. Background technique [0003] 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. Therefore, in recent years, nickel-metal hydride batteries, lithium-ion batteries, sodium-sulfur batteries, etc., cannot replace lead-acid batteries in the field of energy storage. [0004] Aqueous batteries are emerging. The working principle of the battery is that the positive electrode is based on the extraction-intercalation reaction of the first metal ion, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/14H01M10/12
CPCY02E60/10Y02P70/50
Inventor 罗小松刘洋刘新永陈璞
Owner POSITEC POWER TOOLS (SUZHOU) CO LTD
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