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Li-ion supercapacitor

A technology of supercapacitors and lithium ions, applied in capacitors, electrolytic capacitors, circuits, etc., can solve problems such as consumption of lithium ions, instability, and energy density limitations in voltage windows

Active Publication Date: 2013-03-06
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

Due to the low electrochemical potential of lithium iron phosphate, the voltage window (the voltage window is only 2.0~3.8V) and energy density of lithium-ion supercapacitors are limited; at the same time, the pre-embedded lithium process is more complicated, which increases the process cost
Wu Mingxia and others reported a hybrid supercapacitor ("Electronic Components and Materials", Vol. 30, No. 1, 2011, pp. 34-37), which uses LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 As the active material of the positive electrode, activated carbon is used as the active material of the negative electrode. Since the specific surface area of ​​the activated carbon is very large and the solid electrolyte interphase (Solid Electrolyte Interphase, SEI) generated on its surface is unstable, it will consume a large amount of lithium ions, so provide LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 The material must be very excessive, and the positive and negative electrode capacity ratio can reach 4:1 to have a good effect. However, LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 The price of the material is expensive, and it is obviously uneconomical to use an excessive amount of positive electrode active material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Take 10 parts by mass of polyvinylidene fluoride and dissolve it in 250 parts by mass of N-methylpyrrolidone, add 10 parts by mass of conductive carbon black Super P, the specific surface area of ​​20 parts by mass is 1600m 2 / g of activated carbon and 60 parts by mass of LiNi 0.5 co 0.2 mn 0.3 o 2 , mixed evenly, coated on an aluminum foil, and fully dried to obtain a positive electrode sheet.

[0014] Take 5 parts by mass of polyvinylidene fluoride and dissolve it in 125 parts by mass of N-methylpyrrolidone, add 90 parts by mass of artificial graphite CAG-3MT and 5 parts by mass of conductive carbon black Super P, mix well and apply to copper Foil, fully dried to obtain a negative electrode sheet.

[0015] Control the thickness of the coated coating layer, so that the LiNi of the positive electrode sheet after cutting 0.5 co 0.2 mn 0.3 o 2 The mass ratio of the artificial graphite to the negative plate is 1.2. After the positive and negative electrodes are ro...

Embodiment 2

[0017] Take 30 parts by mass of polyvinylidene fluoride and dissolve it in 750 parts by mass of N-methylpyrrolidone, add 30 parts by mass of conductive carbon black Super P, and the specific surface area of ​​80 parts by mass is 2100m 2 / g of activated carbon and 160 parts by mass of LiNi 0.5 co 0.3 mn 0.2 o 2 , mixed evenly, coated on an aluminum foil, and fully dried to obtain a positive electrode sheet.

[0018] Take 5 parts by mass of polyvinylidene fluoride and dissolve it in 125 parts by mass of N-methylpyrrolidone, add 90 parts by mass of mesocarbon microspheres and 5 parts by mass of conductive carbon black Super P, mix well and apply to copper Foil, fully dried to obtain a negative electrode sheet.

[0019] Control the thickness of the coated coating layer, so that the LiNi of the positive electrode sheet after cutting 0.5 co 0.3 mn 0.2 o 2 The mass ratio of the mesophase carbon microspheres to the negative electrode sheet is 0.9. After the positive electrode ...

Embodiment 3

[0021] Take 10 parts by mass of polyvinylidene fluoride and dissolve it in 300 parts by mass of N-methylpyrrolidone, add 45 parts by mass of Ketjen Black EC-600JD and 45 parts by mass of LiNi0.6 co 0.2 mn 0.2 o 2 , mixed evenly, coated on an aluminum foil, and fully dried to obtain a positive electrode sheet.

[0022] Take 5 parts by mass of polyvinylidene fluoride and dissolve it in 125 parts by mass of N-methylpyrrolidone, add 90 parts by mass of soft carbon SC-1 and 5 parts by mass of conductive carbon black Super P, mix evenly and apply to copper Foil, fully dried to obtain a negative electrode sheet.

[0023] Control the thickness of the coating film layer of coating, make the LiNi of the cathode sheet after cutting 0.6 co 0.2 mn 0.2 o 2 The mass ratio of the soft carbon to the negative electrode sheet is 0.5. After the positive electrode sheet and the negative electrode sheet are rolled and welded with tabs, the positive electrode sheet and the negative electrode s...

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PUM

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Abstract

The invention provides a Li-ion supercapacitor. The active material of a positive plate of the Li-ion supercapacitor comprises a porous carbon material and LiNixCoyMnzO2; the porous carbon material is at least one of active carbon, an active carbon fiber, porous graphitized carbon black and graphene; the ratio of the porous carbon material to LiNixCoyMnzO2 is (1:1)-(1:4), wherein x+y+z=1, x:y:z=5:2:3 or x:y:z=5:3:2 or x:y:z=6:2:2 or x:y:z=7:1.5:1.5 or x:y:z=8:1:1; the active material of a negative plate is at least one of synthetic graphite, interphase graphite, mesocarbon microbeads, hard carbon and soft carbon; the mass ratio of the LiNixCoyMnzO2 contained in the positive plate to the active material contained in the negative plate is 0.5-1.6; the electrolyte of the Li-ion supercapacitor consists of an electrolyte salt and an organic solvent; the electrolyte salt is selected from LiPF6 or LiBF4 or LiBOB or LiFSI; and the organic solvent is at lest one of ethylene carbonate, carbonic allyl ester, carbonic methyl ester, methyl carbonate, diethyl carbonate and acetonitrile.

Description

technical field [0001] The invention relates to an electrochemical capacitor, in particular to a lithium ion supercapacitor. Background technique [0002] Supercapacitor, also known as electrochemical capacitor, is a new type of energy storage element. It is between traditional capacitors and secondary batteries. Its capacity is much larger than traditional capacitors, and its high-rate charge and discharge performance is far superior to secondary batteries. . Supercapacitors can generally be divided into three types: one is an electric double layer capacitor (EDLC) that uses the principle of an electric double layer at the interface between electrodes and electrolytes to physically store charges, and the other uses the principle of rapid oxidation-reduction reactions on the surface of electrode materials to store charges. Pseudocapacitor (or quasi-capacitor, Pseudocapacitor) of charge, and a hybrid capacitor (Hybrid Capacitor) that combines electric double layer capacitanc...

Claims

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Application Information

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IPC IPC(8): H01G9/042
CPCY02E60/13
Inventor 孙现众张熊马衍伟黄博
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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