CN201514860U

CN201514860U - High-performance nonsymmetrical electrochemical capacitor

Info

Publication number: CN201514860U
Application number: CN2009201005134U
Authority: CN
Inventors: 李文华
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-07-31
Filing date: 2009-07-31
Publication date: 2010-06-23
Anticipated expiration: 2019-07-31

Abstract

The utility model provides a high-performance nonsymmetrical electrochemical capacitor which comprises a non-polarized anode with a capacity of C+; a polarized cathode with a capacity of C-; a partition plate inserted between the anode and the cathode; an electrolytic solution impregnated inside the anode, the cathode and the partition plate; and a sealed housing with anode and cathode leading-out terminals. The high-performance nonsymmetrical electrochemical capacitor is characterized in that the ratio of the capacity C+ of the non-polarized anode to the capacity C- of the polarized cathode meets the condition as follows: C+/C- is more than or equal to 4; and the specific capacity q- of the material of the polarized cathode meets the condition as follows: q- is more than or equal to 35 mAh/g. The nonsymmetrical electrochemical capacitor is excellent in cycle life property and high power property.

Description

The high-performance asymmetric electrochemical capacitor

(1) technical field

The utility model belongs to energy technology, is specifically related to a kind of electrochemical capacitor.

(2) background technology

At present, it is the double electric layer capacitor of polarizable electrode that the both positive and negative polarity of having developed adopts active carbon, compares with secondary cells such as lithium ion battery, Ni-MH battery and lead-acid batteries, has outstanding advantage at aspects such as reliability, high power output characteristic.But its specific energy performance is but incomparable with secondary cell, has limited its application aspect high-energy and high power requirements.

In recent years, in order to solve electrochemical capacitor in the deficiency aspect the specific energy, the electrochemical capacitor practitioner has made many effort, and wherein the mixed type electrochemical capacitor is exactly to improve the comparatively outstanding class of electrochemical capacitor specific energy.For example: Chinese invention patent CN1277444, a kind of novel electric chemical super capacitor and manufacture method thereof have been introduced, be characterized in that anodal oxide or hydroxide by nickel constitutes, negative pole is made of the high surface area porous charcoal, alkaline solution is as electrolyte, the dividing plate that can pass through for ion between positive pole and negative pole, this electric chemical super capacitor has high energy density and power-performance.For another example: Chinese patent ZL00231293.X, a kind of automobile-used double electric layer capacitor, comprise the negative plate made from carbon dust, middle insulating barrier is characterized in that the positive pole of capacitor is to utilize the nickel hydroxide electrode plate to make, positive-negative electrode plate and dividing plate constitute one group of capacitor core, be inserted in the shell that is marked with electrolyte, this automobile-used double electric layer capacitor capacitance is higher 3～4 times than original electric capacity, and specific energy exceeds more than 10 times.In addition, Chinese patent ZL03115105.1, ZL02217074.X etc. have carried out identical or similar invention or utility model innovation to the type capacitor.But, in these disclosed patents or the file, only emphasized the lifting of electrochemical capacitor specific energy, its charge and discharge circulation life characteristic is relatively poor, disclosed its cycle life of such electrochemical capacitor of patent in the past can reach 100,000 times, and the highest in actual applications can only reaching about 50,000 times, serious shadow has limited its application and scope.

(3) summary of the invention

The purpose of this utility model is to provide a kind of outstanding combination property that has, and particularly has the high-performance asymmetric electrochemical capacitor of excellent cycle life characteristics under its operating voltage window.

The purpose of this utility model be achieved in that it comprise at least one pair of electrode, insert the dividing plate between positive pole and the negative pole and be immersed in both positive and negative polarity and dividing plate in electrolyte and have the seal casinghousing of both positive and negative polarity leading-out terminal, comprising capacity in the pair of electrodes is C ⁺Non-polarized positive pole and capacity be C ^-The polarization negative pole, the capacity C of non-polarized positive pole ⁺Capacity C with polarizable negative pole ^-The ratio C that satisfies condition ⁺/ C ^-〉=4, and, the material specific capacity q-that the makes polarization negative pole q-〉=35mAh/g that satisfies condition.

The utility model also has some technical characterictics like this:

1, non-polarized just very nickel oxide electrode, its manufacture method can adopt slug type, also can adopt powder coated non-sintered on collector;

2, the polarization negative pole is made greater than the 35mAh/g active carbon by specific capacity in its operating voltage window 0.8V-1.5V scope;

3, electrolyte is the potassium hydroxide aqueous solution of 30% concentration;

4, dividing plate is the separator for alkaline cell that materials such as polypropylene, polyethylene are made;

5, the seal casinghousing that has leading-out terminal is made by polyethylene, polypropylene or nylon.

The utility model is by being controlled at the capacity of the non-polarized positive pole ratio with the capacity of polarization negative pole in certain scope, and in the polarization negative pole, adopt and satisfy the absorbent charcoal material that certain specific capacity requires, produced asymmetric electrochemical capacitor with excellent cycle life.

The utility model can obtain the asymmetric electrochemical capacitor of excellent cycle life, and its cycle life surpasses 150000 times, and this asymmetric electrochemical capacitor has the characteristic of low internal resistance, high-energy-density simultaneously.

(4) description of drawings

Fig. 1 is the Facad structure schematic diagram of the utility model polarization negative pole;

Fig. 2 is the side structure schematic diagram of the utility model polarization negative pole;

Fig. 3 is the utility model electrode pair combining structure schematic diagram;

Fig. 4 is the utility model capacitor arrangement schematic diagram.

(5) embodiment

For example the utility model is further described below in conjunction with accompanying drawing;

Embodiment 1

Present embodiment comprise one group of electrode, insert the dividing plate 3 between positive pole and the negative pole and be immersed in both positive and negative polarity and dividing plate 3 in electrolyte 4 and have the seal casinghousing 5 of anodal leading-out terminal 6, negative pole leading-out terminal 7 and safety valve 8, comprising capacity in the electrode is C ⁺Non-polarized anodal 1 and capacity be C ^-Polarization negative pole 2, non-polarized anodal 1 capacity C ⁺Capacity C with polarization negative pole 2 ^-The ratio C that satisfies condition ⁺/ C ^-〉=4, and, the material specific capacity q-that the makes polarization negative pole 2 q-〉=35mAh/g that satisfies condition.

Non-polarized anodal 1 makes: the nickel powder that adopts slurry technology will be mixed with the CMC adhesive is coated on the perforation nickel plated steel strip, through forming thickness behind the high temperature sintering is the collector of 0.5mm, adopt electrochemical method that nickel oxide is deposited in the hole in the collector body, through discharge and recharge change into after, electrode is cut into the non-polarized positive plate of 100 * 70mm, and the capacity of each positive plate is 1000mAh.

Polarization negative pole 2 is made: with active carbon (at the 0.8V-1.5V voltage range specific capacity 42mAh/g) powder of constant weight, the PTFE emulsion and the deionized water of adding 10%, be mixed into glue connection shape, and be pressed into sheet, after the drying, be pressed into the thick active carbon plate 9 of 0.9mm, be pressed together on the both sides of perforation collector 10 nickel plated steel strips that are of a size of 100 * 70mm with flaking machine, the formation capacity is the polarization negative pole of 250mAh.

Dividing plate 3 adopts the PP graft copolymer membrane.

Electrolyte 4 adopts the potassium hydroxide solution of 30% concentration.

Capacitor assembling: 9

non-polarized anodal

1,10 polarization negative poles 2 and dividing plate 3 are stacked into one group of electrode pair according to the sequence alternate of dividing plate-negative pole-dividing plate-positive pole-dividing plate, be connected anodal leading-out terminal 6 and negative pole leading-out terminal 7 non-polarized anodal 1 with the lug place of polarization negative pole 2, put into polypropylene casing 5 then, end cover, inject electrolyte 3, make asymmetric electrochemical capacitor.Test result is presented in the table 1.

Embodiment 2

Present embodiment is basic identical with embodiment 1, and difference is that carbon plate thickness is 0.7mm, and the negative plate capacity of formation is 200mAh.The test result of capacitor is presented in the table 1.

Embodiment 3

Present embodiment is basic identical with embodiment 1, and difference is that carbon plate thickness is 0.55mm, and the negative plate capacity of formation is 170mAh.The test result of capacitor is presented in the table 1.

Embodiment 4

Present embodiment is basic identical with embodiment 1, and difference is that having adopted specific capacity is the active carbon of 35mAh/g, and carbon plate thickness is 1mm, and the negative plate capacity of formation is 250mAh.The test result of capacitor is presented in the table 1.

Embodiment 5

Present embodiment is basic identical with embodiment 1, and difference is that carbon plate thickness is 1.2mm, and the negative plate capacity of formation is 330mAh.The test result of capacitor is presented in the table 1.

Embodiment 6

Present embodiment is basic identical with embodiment 1, and difference is that carbon plate thickness is 1.7mm, and the negative plate capacity of formation is 500mAh.The test result of capacitor is presented in the table 1.

Embodiment 7

Present embodiment is basic identical with embodiment 1, and difference is that having adopted specific capacity is the active carbon of 28mAh/g, and carbon plate thickness is 1.3mm, and the negative plate capacity of formation is 250mAh.The test result of capacitor is presented in the table 1.

Embodiment 8

Present embodiment is basic identical with embodiment 1, and difference is that having adopted specific capacity is the active carbon of 23mAh/g, and carbon plate thickness is 1.5mm, and the negative plate capacity of formation is 250mAh.The test result of capacitor is presented in the table 1.

Table 1

As shown in Table 1, compare with the asymmetric electrochemical capacitor of comparative example, the asymmetric electrochemical capacitor that the utility model embodiment obtains has the charge and discharge cycles number of times greater than 150,000 times, in addition, owing to have lower internal resistance characteristic, therefore, the resulting asymmetric electrochemical capacitor of the utility model has excellent power characteristic simultaneously.

Claims

1. high-performance asymmetric electrochemical capacitor, it comprise at least one pair of electrode, insert the dividing plate (3) between positive pole and the negative pole and be immersed in both positive and negative polarity and dividing plate in electrolyte (4) and have the both positive and negative polarity leading-out terminal seal casinghousing (5), it is characterized in that comprising in the pair of electrodes capacity is C ⁺Non-polarized positive pole (1) and capacity be C ^-Polarization negative pole (2), the material specific capacity q-q-〉=35mAh/g that satisfies condition of polarization negative pole, the capacity C of non-polarized positive pole ⁺Capacity C with polarizable negative pole ^-The ratio C that satisfies condition ⁺/ C 〉=4.

2. according to the described high-performance asymmetric electrochemical capacitor of claim, it is characterized in that non-polarized positive pole (1) is a nickel oxide electrode, polarization negative pole (2) is made greater than the 35mAh/g active carbon by specific capacity in its operating voltage window 0.8V-1.5V scope, electrolyte (4) is the potassium hydroxide aqueous solution of 30% concentration, dividing plate (3) is the separator for alkaline cell that polypropylene, polyethylene are made, and the seal casinghousing (5) that has leading-out terminal is made by polyethylene, polypropylene or nylon.