Lithium ion capacitor positive plate and lithium ion capacitor using same

A technology of lithium ions and capacitors, which is applied in the field of electrochemical energy storage devices, can solve problems such as complicated process and lower energy density of lithium ion capacitors, and achieve the effects of good conductivity, improved energy density and power density, and high adsorption charge capacity

Active Publication Date: 2013-11-27
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The previous patent literature (CN102746805A) disclosed that when activated carbon is used as the positive electrode material, in order to reduce the contact resistance between the active material and the current collector, a layer of conductive material is often pre-coated on the current collector. In this way, not only the process is complicated, but also Also reduces the energy density of Li-ion capacitors

Method used

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  • Lithium ion capacitor positive plate and lithium ion capacitor using same
  • Lithium ion capacitor positive plate and lithium ion capacitor using same
  • Lithium ion capacitor positive plate and lithium ion capacitor using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Production of positive electrode sheet: Weigh functional graphene (GNS), polyvinylidene fluoride (PVDF) binder N-base- 2-ylpyrrolidone solution, conductive agent Super P, mix the three into a uniform slurry according to the mass ratio GNS: PVDF: Super P=85:5:10, and apply the slurry evenly on the surface with a porosity of 30 % on the aluminum foil current collector, the surface density of the slurry on the pole piece is 5mg / cm 2 , the size of the pole piece is 3cm × 5cm, and the aluminum strip tab is welded.

[0026] Production of negative electrode sheet: Weigh modified natural graphite (G), styrene-butadiene rubber emulsion (SBR) / sodium carboxymethyl cellulose (CMC), conductive agent Super P, according to the mass ratio G : SBR : CMC : Super P = 92 : 3.5 : 1.5 : 3 Mix it into a uniform slurry, and apply the slurry evenly on the copper foil current collector with a porosity of 50%, and the surface density of the slurry on the pole piece is 5mg / cm 2 , the size of t...

Embodiment 2

[0035] The production of the positive electrode sheet: the functional graphene in Example 1 is replaced with a specific surface area of ​​2300 m 2 / g of the porous graphene material, all the other manufacturing processes of the positive electrode sheet are the same as in Example 1.

[0036] Production of the negative electrode sheet: the modified natural graphite in Example 1 was replaced with graphitized mesophase carbon microspheres, and the rest of the production process of the negative electrode sheet was the same as in Example 1.

[0037] Electrolyte and diaphragm use the same system as in Example 1.

[0038] According to the order of auxiliary electrode / diaphragm / negative electrode / diaphragm / positive electrode / diaphragm / negative electrode, the capacitor unit is formed in a stacked manner, and the two negative electrode tabs are welded together, placed in an aluminum-plastic case, and packaged.

[0039] Negative electrode pre-intercalation lithium method: the auxiliary e...

Embodiment 3

[0042] Production of the positive pole piece: the functional graphene in Example 1 was replaced with a graphene / titanium nitride (the content of titanium nitride was 15 wt%) composite material, and the rest of the production process of the positive pole piece was the same as in Example 1.

[0043] Production of the negative electrode sheet: the modified natural graphite in Example 1 was replaced with an artificial graphite material, and the rest of the production process of the negative electrode sheet was the same as in Example 1.

[0044] Electrolyte and diaphragm use the same system as in Example 1.

[0045] According to the order of auxiliary electrode / diaphragm / negative electrode / diaphragm / positive electrode / diaphragm / negative electrode, the capacitor unit is formed in a stacked manner, and the two negative electrode tabs are welded together, placed in an aluminum-plastic case, and packaged.

[0046] Negative electrode pre-intercalation lithium method: The auxiliary elect...

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Abstract

The invention discloses a lithium ion capacitor positive plate and lithium ion capacitor using the same. The lithium ion capacitor positive plate comprises an active material, a conductive agent, a bonding agent and a current collector, wherein the active material is a compound material composed of surface functionalized grapheme, a nanometer active grapheme material and grapheme / metal nitride, the current collector is a multi-hole current collector, the opening rate of the current collector is 30% to 50%, and lithium ions can freely penetrate through the current collector. The positive plate has the advantages of being high in specific surface area, high in absorption charge capacitance, good in electrical conductivity and capable of effectively improving energy density and power density of a lithium ion capacitor. The invention further discloses a lithium ion capacitor using the positive plate. The lithium ion capacitor comprises a positive electrode, a negative electrode, a diaphragm, electrolyte solution and an auxiliary electroe capable of achieve the function of previously embedding lithium into the negative electrode.

Description

technical field [0001] The invention relates to an electrochemical energy storage device, in particular to a positive electrode sheet of a lithium ion capacitor and a lithium ion capacitor using the positive electrode sheet. Background technique [0002] With the development of society, human beings are not only facing the depletion of non-renewable energy such as coal and oil, but also facing serious environmental pollution problems. The new energy field represented by solar energy and wind energy, as well as the electric vehicle industry, which uses high-performance energy storage components to replace petroleum-driven vehicles to achieve emission reduction, have put forward more profound requirements on the energy density, power density and service life of energy storage devices. requirements. [0003] Lithium-ion capacitors are a new type of energy storage device, and the charging and discharging principles of the positive and negative electrodes are different. The pri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/50H01G11/06
CPCY02E60/13
Inventor 崔光磊韩鹏献姚建华
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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