Electrolyte, electrode plate, supercapacitor monomer, and supercapacitor and preparation method thereof

A technology of supercapacitors and electrode plates, applied in the field of electrochemistry, can solve the problems of inability to 0v voltage, low failure voltage, loss of long life characteristics of supercapacitors, etc., so as to reduce production costs and solve the effects of energy density and power density.

Inactive Publication Date: 2014-04-30
HUBEI SHENGRONG TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The comparative development and production of Li / C, Pb / C, Ni / C, etc. shows that the asymmetric supercapacitor (or the so-called hybrid capacitor with the internal parallel relationship with the battery) is not the combination of high power of the capacitor and high energy of the battery. On the contrary, it loses both, and also loses the long-life characteristics of supercapacitors. The cycle life of symmetrical electrode supercapacitors is generally 100,000 times, and the asymmetrical electrode can hardly exceed 50,000 times. Almost all have a minimum Failure voltage problem, unable to restore 0v voltage
[0004] At home and abroad, it is mainly in the organic system around Li + Leading production and research, although the energy density of the organic system is about 4 times higher than that of the inorganic system, the organic system is almost always manufactured as a monomer (mainly 2.5v-2.7v), and then divided into groups to meet high-voltage applications. The consistency of batteries and capacitors is a worldwide problem. Only companies with a batch production capacity of more than 1,000 or 10,000 units have the room for group application. If it exceeds 48V, the reliability will be greatly reduced.
[0006] Inorganic supercapacitors have good safety, which is recognized in the industry. Its failure mechanism is: if it breaks down, it will only have a local electric spark, and it will be extinguished as the stored energy is exhausted, and the energy storage will be lost after leakage. capability, but then also has circuit continuity

Method used

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Examples

Experimental program
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preparation example Construction

[0034] The preparation method of electrode plate of the present invention mainly comprises the following steps:

[0035] (1) In a closed mixer with vacuum, 6-18 parts by weight of Li 2 SO 4 Add while stirring and dissolve in deionized water to form a solution, then add 100 parts by weight of KOH while stirring in this solution, because KOH will dissolve Li 2 SO 4 Extruded from the aqueous solution to form a paste solution, the water content in the paste solution is 60-70wt%. Li 2 SO4 The order of adding KOH and KOH cannot be reversed, otherwise the electrolyte will not be evenly distributed; the water used is freshly prepared, otherwise the internal resistance will increase.

[0036] (2) Add 50-59 parts by weight of activated carbon to the paste solution obtained in step (1) while stirring, thereby forming an inorganic electrolyte slurry. Stirring was continued for at least 6 hours after the slurry was formed without changing the direction of stirring. The electrolyte sl...

Embodiment 1

[0044] In a closed mixer with vacuum, 6 parts by weight of Li 2 SO 4 Add deionized water to dissolve while stirring to form a solution, the conductivity of the deionized water used is 8, and the resistivity is 12, then add 100 parts by weight of KOH to the above solution while stirring to form a paste solution, in this paste solution The water content of the mixture is 70wt%. Finally, 50 parts by weight of activated carbon is added while stirring to form an inorganic electrolyte slurry. The stirring direction is not changed and the stirring is continued for 6 hours. The viscosity of the slurry is 3000cP. Use the ultra-thin steel strip made of Q235 ordinary carbon structural steel with a thickness of 0.032mm as the current collector, use the coating machine to evenly coat the above slurry on the front and back of the ultra-thin steel strip, and dry at 130°C , when the water content in the slurry is 41wt%, stop drying, compact it at 15T, and then cut it into a size of 160mm×160...

Embodiment 2

[0046] In a closed mixer with vacuum, 8 parts by weight of Li 2 SO 4 Add deionized water to dissolve while stirring to form a solution, the conductivity of the deionized water used is 8, and the resistivity is 12, then add 100 parts by weight of KOH to the above solution while stirring to form a paste solution, in this paste solution The water content of the mixture is 67wt%. Finally, 52 parts by weight of activated carbon is added while stirring to form an inorganic electrolyte slurry. The stirring direction is not changed and the stirring is continued for 7 hours. The viscosity of the slurry is 3100cP. Use the ultra-thin steel strip made of Q235 ordinary carbon structural steel with a thickness of 0.04mm as the current collector, use the coating machine to evenly coat the above slurry on the front and back of the ultra-thin steel strip, and dry at 150°C , when the water content in the slurry is 43wt%, stop drying, compact it with a pressure of 15T, and then cut it into a si...

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Abstract

The invention provides an inorganic electrolyte containing 6 to 18 parts by weight of Li2SO4 and 100 parts by weight of KOH. In addition, an electrode plate is also provided and comprises a current collector and inorganic electrolyte coating layers coating the two sides of the current collector. According to a preparation method for the electrode plate, the 6 to 18 parts by weight of Li2SO4 is added into water and is dissolved to form a solution and the 100 parts by weight of KOH is added into the solution to form a pasty solution; 50 to 59 parts by weight of activated carbon is added into the pasty solution to form an inorganic electrolyte slurry; and the surfaces of the two sides of the current collector are coated by the inorganic electrolyte slurry and drying is carried out until the water content of the slurry is reduced to 41to 45wt% to obtain an electrode plate. Besides, the invention also provides a supercapacitor monomer including a positive electrode plate, a diaphragm, and a negative electrode plate, wherein the positive electrode plate and the negative electrode plate are ones prepared by using the electrode plate preparation method. Moreover, provided in the invention is a supercapacitor that is formed by series connection of supercapacitor monomers based on a bipolar laminated mode. And according to a preparation method for the supercapacitor, electrode plates are cut into ones with the required dimension; a diaphragm is placed between each two adjacent electrode plates and compaction is carried out; and then packaging is carried out.

Description

technical field [0001] The invention relates to the field of electrochemistry, in particular to an inorganic electrolyte for a supercapacitor, an electrode plate, a supercapacitor monomer and a supercapacitor, and a method for preparing the electrode plate and the supercapacitor. Background technique [0002] Inorganic supercapacitors, especially C / C symmetrical electrode double-layer capacitors, since the voltage of a single cell is within 1V, according to E=1 / 2CU*U, the energy of the capacitor is proportional to the square of the voltage, and the voltage between the single-layer double-layer capacitors If it is too low, it will inevitably lead to too low energy density, which is why the counterparts in the world seldom conduct further in-depth research and do not form a complete production line. Many researchers and companies give up this direction and turn to the research of organic supercapacitors, because LiPF6 is used as the electrolyte, and the voltage can reach 2.5V-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/60H01G11/30H01G11/86H01G11/84H01G11/10
CPCY02E60/13
Inventor 王元湘
Owner HUBEI SHENGRONG TECH CO LTD
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