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Hard-carbon-based chemical power supply with long service life

A chemical power source and hard carbon technology, applied in the field of electrochemical energy storage, can solve the problems of battery capacity attenuation, cycle life deterioration, electrolyte decomposition, etc., and achieve the effect of high power density and high energy density

Inactive Publication Date: 2013-04-17
SHANGHAI AOWEI TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the introduction of porous carbon in the negative electrode of this type of supercapacitor, although the specific power of the device will be increased at room temperature, the porous carbon in the negative electrode will decompose the electrolyte at high temperature, making it difficult to be practical
In the patent application No. 201010114600.2, the positive electrode material is a mixture of lithium ion intercalation compound and porous carbon material. Although it solves the problem that the porous carbon of the negative electrode will decompose the electrolyte at high temperature, it can be practical, but because porous carbon typically represents activated carbon as The electric double layer is more suitable for the negative electrode, and the available range is reduced when the lithium ion intercalation compound is mixed with the positive electrode
In addition, the current high-power lithium-ion batteries, under high-rate (above 10C) charging, due to the structural damage of the carbon negative electrode, lithium dendrites precipitate on the surface of the negative electrode, resulting in a decrease in the reversible capacity of the negative electrode, severe battery capacity attenuation, and poor cycle life.

Method used

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  • Hard-carbon-based chemical power supply with long service life
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Examples

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Effect test

Embodiment 1

[0041] The making of positive plate: the LiMn that total amount is 1000g 2 o 4 , graphene, conductive carbon black, and PVDF are mixed in a mass ratio of 45:45:5:5, mixed with NMP to make a slurry, and then coated on a 20μm aluminum foil (coating surface capacity: 15Ah / m 2 ), dried (110-120°C), rolled, and cut into pieces (size: 37.5*59.5mm 2 ), 24h vacuum drying (120~130°C) to make a positive electrode sheet.

[0042] Production of the negative electrode sheet: mix a total of 1000g of hard carbon and PVDF at a mass ratio of 90:10, make a slurry with NMP, and then coat it on a 16μm copper foil (coating surface capacity: 30 Ah / m 2 , the capacity of the negative electrode is twice that of the positive electrode), after drying (110-120°C), rolling, and cutting (size: 37.5*59.5mm 2 ), 24h vacuum drying (120 ~ 130 ℃) to make negative electrode sheet. A three-layer composite diaphragm is selected as the diaphragm, and the positive electrode (8 pieces), the diaphragm, and the neg...

Embodiment 2

[0044] The production of the positive electrode sheet: LiCoO with a total amount of 1000g 2 , graphene, conductive carbon black, and PVDF are mixed in a mass ratio of 45:45:5:5, mixed with NMP to make a slurry, and then coated on a 20μm aluminum foil (coating surface capacity: 15Ah / m 2 ), dried (110-120°C), rolled, and cut into pieces (size: 37.5*59.5mm 2 ), 24h vacuum drying (120~130°C) to make a positive electrode sheet.

[0045] Production of the negative electrode sheet: mix a total of 1000g of hard carbon and PVDF at a mass ratio of 90:10, make a slurry with NMP, and then coat it on a 16μm copper foil (coating surface capacity: 30 Ah / m 2 , the capacity of the negative electrode is twice that of the positive electrode), after drying (110-120°C), rolling, and cutting (size: 37.5*59.5mm 2 ), 24h vacuum drying (120 ~ 130 ℃) to make negative electrode sheet. A three-layer composite diaphragm is selected as the diaphragm, and the positive electrode (8 pieces), the diaphragm,...

Embodiment 3

[0047] The production of the positive electrode sheet: LiNiO with a total amount of 1000g 2 , graphene, conductive carbon black, and PVDF are mixed in a mass ratio of 45:45:5:5, mixed with NMP to make a slurry, and then coated on a 20μm aluminum foil (coating surface capacity: 15Ah / m 2 ), dried (110-120°C), rolled, and cut into pieces (size: 37.5*59.5mm 2 ), 24h vacuum drying (120~130°C) to make a positive electrode sheet.

[0048] Production of the negative electrode sheet: mix a total of 1000g of hard carbon and PVDF at a mass ratio of 90:10, make a slurry with NMP, and then coat it on a 16μm copper foil (coating surface capacity: 30 Ah / m 2 , the capacity of the negative electrode is twice that of the positive electrode), after drying (110-120°C), rolling, and cutting (size: 37.5*59.5mm 2 ), 24h vacuum drying (120 ~ 130 ℃) to make negative electrode sheet. A three-layer composite diaphragm is selected as the diaphragm, and the positive electrode (8 pieces), the diaphragm,...

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Abstract

The invention relates to a hard-carbon-based chemical power supply with long service life. The hard-carbon-based chemical power supply consists of a positive electrode, a negative electrode, and electrolyte and a diaphragm between the positive electrode and the negative electrode; and the hard-carbon-based chemical power supply is characterized in that the positive electrode utilizes a mixture of lithium ion embedded compound and graphene, the negative electrode utilizes hard carbon, and the electrolyte utilizes a non-aqueous organic solvent including lithium ion, wherein the capacity of active substances per unit area of the negative electrode is 1.5-3 times of that of active substances per unit area of the positive electrode. According to the hard-carbon-based chemical power supply with the long service life, disclosed by the invention, the hard carbon material with high specific capacity and good power performance is utilized on the negative electrode, and the graphene with infinite cycle service life served as a part of the mixed positive electrode material is utilized on the positive electrode, so that a supercapacitor has the characteristics of high energy density and high power density; and the hard-carbon-based chemical power supply can be widely applied to fields of electric automobiles, electric tools, solar energy storage, wind energy storage and the like.

Description

technical field [0001] The invention relates to the technical field of electrochemical energy storage, in particular to a supercapacitor, in particular to a hard carbon-based organic hybrid supercapacitor. Background technique [0002] Supercapacitor is a new type of electrochemical energy storage device between traditional capacitors and batteries. Compared with traditional capacitors, it has higher energy density, and its electrostatic capacity can reach thousands of farads to 10,000 farads. Compared with batteries, it has higher High power density and long cycle life, so it combines the advantages of traditional capacitors and batteries, and is a chemical power source with broad application prospects. It has the characteristics of high specific capacity, high power, long life, wide working temperature limit, and maintenance-free. [0003] According to different energy storage principles, supercapacitors can be divided into three categories: electric double layer capacito...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/32H01G11/64H01G11/86
Inventor 安仲勋苗小丽杨恩东吴明霞曹小卫黄廷立颜亮亮
Owner SHANGHAI AOWEI TECH DEV