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Dual-ion capacitor battery

A capacitor battery and dual-ion technology, applied in double-layer capacitors, hybrid capacitor electrodes, hybrid capacitor electrolytes, etc., can solve the problems of poor cycle stability, limited charge-discharge specific capacity, low coulomb efficiency, etc., and achieve high energy density, stable Embedding, resolving coulomb inefficiency effects

Active Publication Date: 2018-05-25
MICROVAST POWER SYST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At the same time, in dual-ion batteries, there is no effective solution to a series of problems such as low Coulombic efficiency, poor cycle stability, and limited charge-discharge specific capacity due to the large size of anions that are difficult to insert into the graphite lattice. The problem is also the key to the practical application of dual-ion batteries

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The first step: mix natural graphite, graphene, and PVDF binder (PVDF is dissolved in NMP, the concentration is 1%wt) according to the ratio of 7:2:1, and then coat it on the aluminum grid and dry it as the positive electrode piece.

[0038] Step 2: Mix mesocarbon microspheres, conductive carbon black, PVDF binder (PVDF dissolved in NMP, concentration 1%wt) according to the ratio of 8:1:1, and then coat it on the aluminum foil Dry as a negative electrode sheet.

[0039] Step 3: The diaphragm adopts glass microfiber diaphragm, and the electrolyte adopts 4mol / L LiPF 6 EMC (ethyl methyl carbonate) solution.

[0040] Step 4: In an environment with controlled water and oxygen content, superimpose the above-mentioned electrode sheets and separators in the order of positive electrode sheet, separator, and negative electrode sheet in the CR2032 battery case, inject an appropriate amount of electrolyte, and seal the battery case to make a button battery.

[0041] Step 5: Carr...

Embodiment 2

[0043] Step 1: Mix mesophase carbon microspheres, activated carbon, and PVDF binder (PVDF is dissolved in NMP at a concentration of 1%wt) in a ratio of 6:3:1, and then coat and dry on carbon cloth dry as the positive electrode.

[0044] The second step: mix natural graphite, conductive carbon black, and PVDF binder (PVDF is dissolved in NMP, the concentration is 1%wt) according to the ratio of 8:1:1, and then coat it on aluminum foil and dry it as Negative plate.

[0045] The third step: the diaphragm adopts PP polymer diaphragm, and the electrolyte adopts 2mol / L LiTFSI ethyl methyl carbonate (EMC) solution.

[0046] Step 4: In an environment with controlled water and oxygen content, superimpose the above-mentioned electrode sheets and separators in the order of positive electrode sheet, separator, and negative electrode sheet in the aluminum-plastic film, inject an appropriate amount of electrolyte, and seal the aluminum-plastic film to make a small soft pack battery .

[...

Embodiment 3

[0049] The first step: mix natural graphite, activated carbon, PTFE binder (PTFE dissolved in deionized water, the concentration is 40%wt) according to the ratio of 4:4:2, and then coat it on the nickel foam and dry it as Positive sheet.

[0050] The second step: directly use metal aluminum foil as the negative electrode.

[0051] Step 3: The diaphragm is made of glass microfiber, and the electrolyte is made of 6mol / L LiPF 6 solution of ethyl methyl carbonate (EMC).

[0052] The fourth step: same as embodiment 1

[0053] Step 5: Carry out the electrochemical performance test of the above-mentioned button battery, wherein the charging and discharging test voltage range is 3V-5V, and the specific test results are shown in Table 1.

[0054] Embodiment 3 test result such as figure 2 and image 3 As shown, among them, constant current charging and discharging is adopted, the charging and discharging voltage range is 3-5V, and the charging and discharging rate is 0.5C.

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Abstract

The invention relates to a dual-ion capacitor battery. The dual-ion capacitor battery provided by the invention comprises a positive electrode, a negative electrode, a diaphragm and an electrolyte. Anactive material of the positive electrode is a carbon material. An electric double layer capacitor is formed on the surface of the negative electrode. According to the dual-ion capacitor battery provided by the invention, the problem that the coulombic efficiency and cycling stability are low is effectively solved. Compared with a dual-ion battery and a supercapacitor, the dual-ion capacitor battery has the advantage that the energy density is higher.

Description

technical field [0001] The invention relates to a dual-ion capacitor battery. Background technique [0002] In recent years, due to the large-scale commercial application of lithium-ion batteries, the reserves of lithium on the earth are getting less and less, and the price of lithium will definitely show an upward trend. Therefore, compared with lithium-ion batteries, the cost of dual-ion batteries is lower. [0003] In the dual-ion battery, take the dual-graphite battery in which the positive and negative electrode materials are composed of graphite as an example, and the electrolyte salt is LiPF 6 . When the battery is charged, the Li in the electrolyte + Ions migrate towards the negative electrode and intercalate into the negative electrode graphite, PF 6 - The ions migrate to the positive electrode and are embedded in the positive electrode graphite; when the battery is discharged, the anions and cations embedded in the positive and negative electrodes return to the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/06H01G11/24H01G11/32H01G11/50H01G11/62H01G11/60
CPCH01G11/06H01G11/24H01G11/32H01G11/50H01G11/60H01G11/62Y02E60/13
Inventor 文娟·刘·麦蒂斯张佳卫钱培权
Owner MICROVAST POWER SYST CO LTD
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