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Battery

A battery and electrolyte technology, applied in secondary batteries, circuits, electrical components, etc., can solve problems such as battery short circuit and potential safety hazards in battery use, and achieve the effects of suppressing dendrites, suppressing side reactions, and improving cycle performance

Active Publication Date: 2015-06-24
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, at present, after the battery is used for a period of time, dendrites will be generated inside the battery, and the dendrites may cause a short circuit of the battery, resulting in a safety hazard in the use of the battery

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0097] In a preferred embodiment, the anions in the electrolyte include one or more of sulfate ions, chloride ions, acetate ions and nitrate ions.

[0098] In another preferred embodiment, the anions in the electrolyte contain alkylsulfonate ions.

[0099] Electrolytes containing alkylsulfonate ions have the following benefits:

[0100] First, the alkylsulfonate ion can effectively improve the solubility of the first metal ion and the second metal ion in the electrolyte; second, the alkylsulfonate ion can inhibit the generation of gas; third, the alkylsulfonate ion can also It can effectively reduce the self-discharge rate of the battery. Fourth, compared with other anion salts, the electrolyte of alkylsulfonate ions does not freeze at -20°C, which can make the battery have better low-temperature performance.

[0101] More preferably, the anions in the electrolyte only contain alkylsulfonate ions, that is, the electrolyte is an alkylsulfonate of the first metal and an alkyls...

Embodiment 1

[0125] Lithium manganese oxide LMO, conductive agent graphite, binder SBR and CMC are mixed in water according to the mass ratio of 90:5:2.5:2.5 to form a uniform positive electrode slurry. The positive electrode slurry was coated on both sides of the positive electrode current collector (50 μm stainless steel plate) coated with a conductive film to form an active material layer, which was then pressed into sheets and cut into a size of 6cm×6cm to make the positive electrode.

[0126] A zinc foil with a thickness of 50 μm was used as the negative electrode. The diaphragm is an AGM glass fiber diaphragm, and the size of the diaphragm and negative electrode is equivalent to that of the positive electrode.

[0127] Weigh a certain amount of zinc sulfate and lithium sulfate, dissolve them in water, and then add gelatin to form an electrolyte with a zinc sulfate concentration of 2 mol / L, a lithium sulfate concentration of 1 mol / L, and a gelatin content of 0.05% by mass.

[0128] T...

Embodiment 2

[0130] The difference from Example 1 is that the mass percentage of gelatin is 0.01%; other parts are the same as in Example 1. The obtained battery is denoted as A2.

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Abstract

The invention discloses a battery. The battery comprises a positive electrode, a negative electrode and an electrolyte, and the positive electrode comprises a positive active substance with reversible intercalation / deintercalation first metal ions; the electrolyte comprises at least one solvent capable of dissolving the electrolyte and ionizing the electrolyte; the electrolyte comprises first metal ions and second metal ions; the second metal ions undergo reducing deposition in a charge process to form a second metal on the negative electrode, and the second metal is oxidized and dissolved in a discharge process to form the second metal ions; and the battery also comprises a negative modifier, and the negative modifier is selected from one or more of gelatin, agar, cellulose, cellulose ether and soluble salts thereof, dextrin and cyclodextrin. The dendrite problem of the second metal on the negative electrode is effectively inhibited, so the safety performance of the battery is enhanced.

Description

technical field [0001] The invention belongs to the field of batteries, in particular to a battery based on internal ion exchange. 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. 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. [0003] A battery based on internal ion exchange has emerged. The working principle of the battery is that the positive electrode is based on the extraction-intercalation reaction of the first metal ion, and the negative electrode is based on the deposition-diss...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/36
CPCY02E60/10
Inventor 刘洋陈璞
Owner POSITEC POWER TOOLS (SUZHOU) CO LTD