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Positive electrode material and aqueous battery containing positive electrode material

A cathode material and battery technology, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of graphite corrosion of battery cathode conductive agent, reduction of battery cycle life, and gas generation of batteries, so as to avoid graphite corrosion and reduce battery production. Gas and self-discharge, the effect of suppressing performance degradation

Active Publication Date: 2015-07-08
POSITEC POWER TOOLS (SUZHOU) CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, at present, when the battery is being charged, graphite, the positive electrode conductive agent of the battery, will corrode and be consumed. On the one hand, this phenomenon leads to serious self-discharge of the battery, and on the other hand, it causes gas to be generated inside the battery, thereby rapidly reducing the cycle life of the battery.

Method used

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  • Positive electrode material and aqueous battery containing positive electrode material
  • Positive electrode material and aqueous battery containing positive electrode material

Examples

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Embodiment 1

[0109] Mix lithium manganate LMO, conductive agent graphite, binder styrene-butadiene rubber (SBR) and sodium carboxymethyl cellulose (CMC) in water according to the mass ratio LMO:CMC:SBR:graphite=86.5:1:2.5:10 , forming a uniform positive electrode slurry. Graphite is spherical graphite, and the median diameter d50 of graphite is 3.4 μm, and d10 is 2 μm. The positive electrode slurry is coated on both sides of the positive electrode current collector to form an active material layer. The positive electrode current collector is carbon steel coated with a PE conductive film with a thickness of 200 μm. into the positive pole.

[0110] A zinc foil with a thickness of 50 μm was used as the negative electrode. The diaphragm is an AGM glass fiber diaphragm. The separator and negative electrode are comparable in size to the positive electrode. The positive electrode, the negative electrode and the diaphragm are laminated and assembled into a battery cell, which is loaded into th...

Embodiment 2

[0112] The difference from Example 1 is that the median particle diameter d50 of the conductive agent graphite is 8.0 μm, and the d10 is 3 μm, and the composition and materials of the other positive electrodes are the same as those in Example 1 to make the positive electrode.

Embodiment 3

[0114] The difference from Example 1 is that the median particle diameter d50 of the conductive agent graphite is 18.6 μm, and the d10 is 5 μm, and other positive electrode compositions and materials are the same as in Example 1 to make a positive electrode.

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Abstract

The invention discloses a positive electrode material. The positive electrode material comprises a positive electrode active material and a conductive agent--graphite, wherein the positive electrode active material can be reversibly extracted from and embedded into a first metal ion, and the graphite has a particle size of less than 50 [mu] m and a crystallization degree of no less than 90%. The invention also discloses an aqueous battery. The aqueous battery comprises a positive electrode, a negative electrode and an electrolyte, wherein the positive electrode comprises the positive electrode material. The conductive agent--the graphite of the invention has good stability and corrosion resistance, reduces self discharging rate of the battery and enhances the cycle performance of the battery.

Description

technical field [0001] The invention belongs to the field of batteries, and in particular relates to a positive electrode material. [0002] The invention also relates to batteries based on internal ion exchange. 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] A new type of aqueous battery based on internal ion exchange has emerged. The working principle of the battery is that the positive electrode is based on the extraction-in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/505H01M4/525H01M4/62H01M10/36
CPCH01M4/625H01M10/36Y02E60/10
Inventor 刘洋陈璞
Owner POSITEC POWER TOOLS (SUZHOU) CO LTD
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