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Double-electrolyte secondary battery

A secondary battery and dual electrolyte technology, applied in secondary batteries, secondary battery repair/maintenance, organic electrolytes, etc., can solve the problems of many failure mechanisms, short cycle life of lead-acid batteries, shortage of resources, etc., and achieve utilization rate boosted effect

Pending Publication Date: 2021-09-03
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the secondary batteries for energy storage used in the industry include: lead-acid batteries, lithium-ion batteries, flow batteries, high-temperature sodium-sulfur batteries, etc., but there are some problems in them, and it is difficult to fully meet the energy storage needs, such as lead-acid battery cycle Short life and many failure mechanisms; high cost of lithium-ion batteries and unavoidable safety hazards; high cost of flow batteries and shortage of resources; high-temperature sodium-sulfur batteries need to work at high temperatures, difficult maintenance, and prominent safety hazards

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] As attached to the manual figure 1 As shown, an aluminum shell with an inner diameter of 50mm, a wall thickness of 3mm, and a height of 50mm is open at the top; A wire and seal it, and the wire is connected to a circular titanium mesh with an inner diameter of 40mm and a thickness of 0.5mm in the shell, which is used as the negative electrode collector of the battery. Deploy the electrode slurry of sodium titanium phosphate, conductive carbon black, polyvinylidene fluoride binder and N-methylpyrrolidone with a mass ratio of 8:1:1, and coat the negative electrode collector with 0.5mm thick electrode slurry and then drying to obtain a battery negative electrode in which the negative electrode active material and the current collector are closely bonded. Then add 100ml of propylene carbonate solution of 1mol / L sodium trifluoromethanesulfonimide sodium in the container as an organic electrolyte, then configure 1mol / L sodium sulfate aqueous solution as an aqueous electrolyt...

Embodiment 2

[0074] Using the same battery structure as in Example 1, prepare an electrode slurry of lithium titanium phosphate, conductive carbon black, and polyvinylidene fluoride binder with a mass ratio of 8:1:1, and coat the aluminum foil with The electrode slurry with a thickness of 0.5 mm is then dried to obtain a battery negative electrode in which the negative electrode active material and the current collector are closely bonded. Then add 100ml of propylene carbonate solution of 1mol / L lithium bistrifluoromethanesulfonimide lithium in the container as an organic electrolyte, then configure a 1mol / L lithium sulfate aqueous solution as an aqueous electrolyte, and take 100ml of Add a certain amount of sodium ferrocyanide and ammonium ferrocyanide to the water-based electrolyte to form an electrolyte solution containing ferrocyanide ions with a concentration of 0.05mol / L, and add it to the container. It can be seen that the two electrolytes in the container are immiscible, and most o...

Embodiment 3

[0076] As attached to the manual figure 2 As shown, an aluminum shell with an inner diameter of 50mm, a wall thickness of 3mm, and a height of 50mm is open at the top; A 0.5mm conductive carbon fiber is directly connected to the external circuit through and sealed in the middle. The carbon fiber is connected to a 10mm thick hydrophilic graphite felt with a diameter of 40mm in the shell to keep the two conductive. The shell is made of polytetrafluoroethylene. The completed lid has a hole in the center of the lid, and the negative current collector is a circular graphite sheet with an inner diameter of 40mm and a thickness of 0.5mm. The conductive carbon fiber is used to connect the graphite sheet to pass through the hole in the center of the lid to connect to the external circuit. Deploy the electrode slurry of poly(2-vinylanthraquinone), conductive carbon black, and polyvinylidene fluoride binder with a mass ratio of 8:1:1, and coat the graphite sheet with a thickness of 0.5m...

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Abstract

The invention belongs to the field of secondary batteries, and particularly relates to a double-electrolyte secondary battery. The secondary battery comprises a positive current collector, a positive active material, an aqueous electrolyte, an organic electrolyte, a negative active material and a negative current collector; the positive active material is dissolved in the aqueous electrolyte, and the positive current collector is infiltrated in the aqueous electrolyte in which the positive electrode active material is dissolved; the negative active material is attached to the negative current collector and is soaked in the organic electrolyte; and the aqueous electrolyte and the organic electrolyte are in direct contact and are not dissolved with each other. The positive active material exists in the liquid in the form of solute, adverse effects caused by deterioration of a crystal structure of a solid do not need to be considered in the charging and discharging process, and the ion diffusion rate and the conductivity in the liquid are far higher than those of the solid, so that the utilization rate of the positive active material is greatly improved compared with that of a traditional battery.

Description

technical field [0001] The invention belongs to the field of secondary batteries, and more specifically relates to a dual-electrolyte secondary battery. Background technique [0002] In order to solve the energy problems that people are facing today and reduce a series of environmental and economic pressures brought about by the consumption of fossil fuels, renewable new energy sources, such as solar energy, tidal energy, and wind energy, have become an important direction for countries to strive for development. However, these energy sources generally have intermittent and random problems in time, and it is difficult to ensure that energy can be used whenever people need it. Therefore, it is necessary to use energy storage technology to store electric energy converted from solar energy, tidal energy, and wind energy. Get up and release when needed. [0003] Among energy storage technologies, secondary battery technology for energy storage has the characteristics of not bei...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/38H01M10/42H01M4/58
CPCH01M10/38H01M10/4235H01M4/58H01M2300/0025H01M2300/0002H01M2300/0085Y02P70/50Y02E60/10
Inventor 沈越周良毅孟锦涛廖梦怡黄云辉
Owner HUAZHONG UNIV OF SCI & TECH
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