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Manufacturing method of lithium ion mixed type capacitor and lithium ion mixed type capacitor

A technology of hybrid capacitors and lithium ions, which is applied in the manufacture of hybrid capacitors, hybrid/electric double layer capacitors, capacitors, etc., can solve the problems of reducing device energy density, increasing process costs, and no longer having limited electrochemical capacity.

Active Publication Date: 2014-08-27
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem with this method is that after the initial lithium intercalation, this part of the doped lithium source material no longer has electrochemical capacity or limited capacity, thereby reducing the energy density of the device.
The preparation of through-hole aluminum foil and copper foil requires chemical etching or mechanical processing, which will significantly increase the process cost

Method used

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  • Manufacturing method of lithium ion mixed type capacitor and lithium ion mixed type capacitor
  • Manufacturing method of lithium ion mixed type capacitor and lithium ion mixed type capacitor
  • Manufacturing method of lithium ion mixed type capacitor and lithium ion mixed type capacitor

Examples

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preparation example Construction

[0019] The preparation method of the positive electrode and the negative electrode is: after the active material, the binder and the conductive agent are uniformly mixed into a slurry in a certain proportion, the coating machine is used to coat the current collector without through holes, and after drying, it is rolled, Cutting to obtain the pole piece of the electrode.

[0020] The binders are polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), sodium carboxymethyl cellulose (CMC), styrene-butadiene rubber (SBR) and LA series water-based adhesive produced by Chengdu Yindile. binder, etc. The conductive agent is selected from conductive carbon black, conductive graphite or carbon nanotubes. The current collector of the positive electrode is aluminum foil without through holes, and the current collector of the negative electrode is copper foil without through holes. The positive electrode active material is composed of one kind of lithium ion battery positive elec...

Embodiment 1

[0030]The active material of the negative electrode is artificial graphite CAG-3MT, the binder is sodium carboxymethyl cellulose and styrene-butadiene rubber, and the conductive agent is conductive carbon black Super C45. According to artificial graphite: conductive carbon black: sodium carboxymethyl cellulose: The mass ratio of styrene-butadiene rubber = 90:5:2:3 is mixed evenly to make a slurry, which is coated on a 12-micron thick copper foil without through holes. After drying, it is rolled and cut to obtain the negative pole piece. The areal density of one side of the pole piece coating layer is 39.3g / m 2 .

[0031] The active material of the positive electrode is lithium nickel cobalt manganese oxide LiNi 0.5 co 0.2 mn 0.3 o 2 , the high specific surface area carbon material is activated carbon YP50F, the binder is polyvinylidene fluoride, the conductive agent is conductive carbon black Super C45 and conductive graphite KS-6, according to activated carbon: nickel cob...

Embodiment 2～6

[0038] The active material of the negative electrode of embodiment 2~6 is hard carbon LN-0010, and binding agent is sodium carboxymethyl cellulose and styrene-butadiene rubber, and conductive agent is conductive carbon black Super C45, press hard carbon: conductive carbon black: carboxyl Sodium methylcellulose: styrene-butadiene rubber = 90:5:2:3 mass ratio mixed evenly to make a slurry, coated on a 12 micron thick copper foil without through holes, rolled and cut after drying Obtain the pole piece of the negative electrode. The areal density of one side of the pole piece coating layer is 47.0g / m 2 .

[0039] The active material of the positive electrode is lithium nickel cobalt manganese oxide LiNi 0.5 co 0.2 mn 0.3 o 2 , the high specific surface area carbon material is activated carbon YP50F, the binder is polyvinylidene fluoride, the conductive agent is conductive carbon black Super C45 and conductive graphite KS-6, according to the positive electrode active material:...

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Abstract

A manufacturing method of a lithium ion mixed type capacitor comprises the following steps that (a) electrode pieces and a separation film are stacked or wound to form a cell according to the sequence of positive electrode / separation film / negative electrode; (b) the cell is put into an aluminum compound packing film shell body, the top edge and a first lateral edge of the aluminum compound packing film shell body are sealed in a heating mode, the electrode lugs of the positive electrode and the negative electrode of the cell extend out of the aluminum compound packing film shell body from the top edge; (c) a metal lithium electrode is put into the aluminum compound packing film shell body, is adjacent to the cell and is separated from the cell by the separation film, and the electrode lug of the metal lithium electrode extends out of the aluminum compound packing film shell body from a second lateral edge; (d) excessive electrolyte is injected into the aluminum compound packing film shell body, and then the second lateral edge of the aluminum compound packing film shell body is sealed in a heating mode; (e) in a constant current mode, the negative electrode serves as a working electrode, the metal lithium electrode serves as a counter electrode, and the negative electrode is pre-embedded; (f) the metal lithium electrode is taken out, the superfluous electrolyte is poured out, the second lateral edge of the aluminum compound packing film shell body is sealed in a vacuum heating mode, and the lithium ion mixed type capacitor is obtained.

Description

technical field [0001] The invention relates to a preparation method of a lithium-ion hybrid capacitor and a lithium-ion hybrid capacitor prepared by the method. Background technique [0002] Lithium-ion hybrid capacitor is a new type of electrochemical energy storage device between lithium-ion batteries and electric double-layer supercapacitors. It not only has the characteristics of high power and long life of electric double-layer supercapacitors, but also has a Compared with the electric double layer supercapacitor, it has been greatly improved. The structural feature of this device is that the positive electrode can be made of carbon-based battery materials including battery positive electrode materials and capacitor materials, and the negative electrode is pre-intercalated lithium. The core of the preparation process is the pre-intercalation lithium process of the negative electrode. At present, there are mainly the following pre-intercalation lithium processes: (1) F...

Claims

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Application Information

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IPC IPC(8): H01G11/84H01G11/06
CPCY02E60/13
Inventor 孙现众马衍伟张熊
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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