Rechargeable battery

A technology of rechargeable batteries and electrolytes, applied in secondary batteries, battery electrodes, circuits, etc., can solve the problems of minimum requirements for commercial production, not easy to decompose, hinder ion transport, etc., to avoid irreversible sulfation and improve cycle life. , the effect of improving reversibility

Active Publication Date: 2018-12-18
刘小林
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] It can be seen from the above equation that during the discharge process of this battery, zinc ions are not embedded in the manganese dioxide lattice, but are mixed with SO in the electrolyte. 4 2- The combination of anions forms a precipitate, which is not easy to be decomposed during the charging process, which greatly reduces the reversibility of the positive electrode and seriously affects the cycle stability of the rechargeable zinc-manganese battery. What's worse, after many cycles, the ZnSO 4 [Zn(OH) 2 ] 3 ·xH 2 O will be wrapped on the surface of the positive electrode material, hindering the transmission of ions in the electrolyte, seriously affecting the capacity and cycle life of the battery
Although there are many ways to improve the reversibility of the positive electrode, the effect is still limited, and the cycle stability of the battery still cannot meet the minimum requirements for commercial production.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0080] Preparation of the positive electrode: first dissolve the binder (polyvinylidene fluoride) in N-methylpyrrolidone to prepare a dispersion with a mass fraction of 5%, and mix manganese dioxide, manganese oxyhydroxide, acetylene black, polyvinylidene Mix vinyl fluoride in a mass ratio of 70:5:15:10, stir evenly in a high-speed mixer, evenly coat the resulting mixture on the surface of graphite conductive paper, move it into a vacuum oven at 120°C, take it out after 12 hours, and cut it to get the positive electrode sheet .

[0081] Electrolyte preparation: 51.1 g of zinc methanesulfonate was dissolved in 100 mL of deionized water to prepare an aqueous solution of zinc methanesulfonate with a concentration of about 1.6 mol / L to obtain an electrolyte.

[0082] The prepared positive electrode sheet is used as the positive electrode, the zinc foil is used as the negative electrode, and the aqueous solution of zinc methanesulfonate containing 1.6 mol / L is used as the electroly...

Embodiment 2

[0085] Preparation of the positive electrode: first dissolve the binder (polyvinylidene fluoride) in N-methylpyrrolidone to make a dispersion with a mass fraction of 5%, and mix manganese dioxide, manganese oxyhydroxide, acetylene black, polyvinylidene Mix vinyl fluoride in a mass ratio of 70:5:15:10, stir evenly in a high-speed mixer, evenly coat the resulting mixture on the surface of graphite conductive paper, move it into a vacuum oven at 120°C, take it out after 12 hours, and cut it to get the positive electrode sheet .

[0086] Preparation of electrolyte solution: Dissolve 51.1 g of zinc methanesulfonate and 4.9 g of manganese methanesulfonate in 100 mL of deionized water to obtain an electrolyte solution. The concentration of zinc methanesulfonate in the obtained electrolyte is about 1.6 mol / L. The concentration of manganese sulfonate is 0.16mol / L.

[0087] The prepared positive electrode sheet is used as the positive electrode, the zinc foil is used as the negative elec...

Embodiment 3

[0091] Preparation of the positive electrode: first dissolve the binder (polyvinylidene fluoride) in N-methylpyrrolidone to prepare a dispersion with a mass fraction of 5%, and mix manganese dioxide, manganese oxyhydroxide, acetylene black, polyvinylidene Mix vinyl fluoride in a mass ratio of 70:5:15:10, stir evenly in a high-speed mixer, evenly coat the resulting mixture on the surface of graphite conductive paper, move it into a vacuum oven at 120°C, take it out after 12 hours, and cut it to get the positive electrode sheet .

[0092] Electrolyte preparation: Dissolve 51.1 g of zinc methanesulfonate and 4.57 g of manganese fluoroborate in 100 mL of deionized water to obtain an electrolyte. The concentration of zinc methanesulfonate in the obtained electrolyte is 1.6 mol / L, and the concentration of manganese fluoroborate It is 0.16mol / L.

[0093] The prepared positive electrode sheet is used as the positive electrode, the zinc foil is used as the negative electrode, the aque...

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Abstract

A rechargeable battery includes an electrolyte, a positive electrode, a negative electrode, and an isolation film disposed between the positive electrode and the negative electrode, The active material of the positive electrode comprises at least one of manganese oxide and manganese oxyhydroxide, the active material of the negative electrode comprises zinc element, and the electrolyte salt in theelectrolyte solution comprises at least one of zinc alkyl sulfonate, zinc aryl sulfonate, zinc fluoroborate, zinc alkyl sulfonate hydrate, zinc aryl sulfonate hydrate and zinc fluoroborate hydrate. The rechargeable battery not only can effectively avoid irreversible sulfation of the positive electrode, the cycle life of rechargeable batteries is improved by increasing the reversibility of the cathode materials, and the rechargeable batteries have higher energy density. Moreover, the corrosion of chloride ions and the reduction of nitrate ions are avoided. Compared with the lithium batteries onthe market, the raw materials used are cheaper, so the rechargeable battery has better economic benefits.

Description

technical field [0001] The invention belongs to the field of chemical power sources, in particular to a rechargeable battery. Background technique [0002] The rechargeable zinc-manganese battery is a green and environmentally friendly chemical power source. It uses manganese oxide as the active material of the positive electrode and zinc as the active material of the negative electrode. The electrolyte of rechargeable zinc-manganese batteries can be mainly divided into two categories, one is alkaline system, but under the condition of alkaline electrolyte, the polarization of rechargeable zinc-manganese batteries is very large, and the cycle stability is very poor; the other is alkaline system. The second type is neutral or weakly acidic system, such as zinc sulfate solution, etc. In the 1990s, through measures such as modifying the positive electrode material and using a dendrite-resistant separator, the rechargeable zinc-manganese battery reached more than 50 cycles of d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/36H01M10/38
CPCH01M10/36H01M10/38H01M2300/0002H01M4/38H01M4/42H01M4/50H01M2004/027H01M2004/028Y02E60/10Y02P70/50H01M2300/002
Inventor 束建军
Owner 刘小林
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