Unlock instant, AI-driven research and patent intelligence for your innovation.

A kind of high-power lithium ion capacitor and preparation method thereof

A lithium ion and capacitor technology, applied in the field of high-power lithium-ion capacitors and their preparation, can solve problems such as slow electrochemical response, and achieve the effects of high power density, good practical application prospects, high power density and cycle stability

Active Publication Date: 2017-05-17
TSINGHUA UNIV
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is limited by the slow electrochemical response of lithium-ion battery-type negative electrodes, and the power density (<5kW / kg) of lithium-ion capacitors still cannot meet the needs of actual use.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A kind of high-power lithium ion capacitor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Microcrystalline graphite is the preparation method of the high-power lithium ion capacitor of negative pole, comprises the following steps:

[0020] Step 1, the specific surface area is 1100m 2 / g, the pore volume is 1.0cm 3 / g of porous carbon, mixed with conductive carbon black (superP), and binder PVDF according to the mass ratio of 75:10:15, and the organic solvent NMP (mass ratio of porous carbon: 4:1) was added to obtain the positive electrode slurry. The positive electrode slurry is coated on the copper foil, and after drying, rolling and punching, the positive electrode sheet of the lithium ion capacitor is obtained, that is, the porous carbon electrode sheet.

[0021] Step 2, high-purity microcrystalline graphite (purity is 99.9%), D50=30 μm, and the mass ratio of the positive electrode porous carbon is 1:1, mixed with conductive carbon black (superP), binder PVDF according to the mass ratio of 80:10:10 uniform, adding organic solvent NMP (mass ratio to micr...

Embodiment 2

[0025] Microcrystalline graphite is the preparation method of the high-power lithium ion capacitor of negative pole, comprises the following steps:

[0026] Step 1, the specific surface area is 2000m 2 / g, the pore volume is 1.5cm 3 / g of porous carbon, mixed with conductive carbon black (superP) and binder PVDF according to the mass ratio of 80:10:10, and adding organic solvent NMP (mass ratio of porous carbon to 6:1) to obtain positive electrode slurry. The positive electrode slurry is coated on the copper foil, and after drying, rolling and punching, the positive electrode sheet of the lithium ion capacitor is obtained, that is, the porous carbon electrode sheet.

[0027] Step 2, high-purity microcrystalline graphite (purity is 99.95%), D50=10 μm, and the mass ratio of positive electrode porous carbon is 1:1.5, and conductive additive (conductive carbon black, superP), binder PVDF according to mass ratio 85:5 : 10 mixed evenly, adding organic solvent NMP (4:1 with microcr...

Embodiment 3

[0031] Microcrystalline graphite is the preparation method of the high-power lithium ion capacitor of negative pole, comprises the following steps:

[0032] Step 1, the specific surface area is 3000m 2 / g, the pore volume is 2.0cm 3 / g of porous carbon, mixed with conductive carbon black (superP) and binder PVDF according to the mass ratio of 75:5:20, and the organic solvent NMP (mass ratio of porous carbon to 8:1) was added to obtain the positive electrode slurry. The positive electrode slurry is coated on the copper foil, and after drying, rolling and punching, the positive electrode sheet of the lithium ion capacitor is obtained, that is, the porous carbon electrode sheet.

[0033] Step 2, high-purity microcrystalline graphite (purity is 99.99%), D50=5 μ m, the mass ratio of positive electrode porous carbon is 1:2, with conductive additive (conductive carbon black, superP), binder PVDF according to mass ratio 90:5: 5 Mix evenly, add organic solvent NMP (mass ratio to micr...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
sizeaaaaaaaaaa
specific surface areaaaaaaaaaaa
retention rateaaaaaaaaaa
Login to View More

Abstract

The invention relates to a high-power lithium ion capacitor and a manufacturing method thereof and belongs to the technical field of lithium ion capacitors. A cathode of the lithium ion capacitor adopts pre-lithiation microlite graphite, an anode of the lithium ion capacitor adopts a porous carbon material, and the assembly process of a lithium ion battery is adopted. The capacitor and the method have the advantage that the lithium ion capacitor with the microlite graphite as the cathode breaks through the rate capability limit of the cathode of the existing lithium ion capacitor, has the rate capability approximate to the anode of the porous carbon, and has high energy density and good circulation stability, the rate performance adjustment of the lithium ion capacitor can be achieved by adjusting the micro structure characteristic of the porous carbon material, and the lithium ion capacitor has wide actual application prospects.

Description

technical field [0001] The invention belongs to the technical field of lithium ion capacitors, in particular to a high-power lithium ion capacitor and a preparation method thereof. Background technique [0002] Lithium-ion batteries and supercapacitors are two novel electrochemical energy storage devices characterized by high energy output and high power output, respectively. Lithium-ion capacitors use lithium-ion battery electrodes at one pole and supercapacitor electrodes at the other pole, so they can output high energy density and power density at the same time, and can also be charged and discharged cyclically. Due to their excellent performance, lithium-ion capacitors are currently used not only in portable small electronic devices such as mobile phones and notebook computers, but also in large devices such as hybrid vehicles. Conventional lithium-ion capacitors can output energy densities above 60Wh / kg. However, it is limited by the slow electrochemical response of ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/32H01G11/06H01G11/84H01G11/86
CPCY02E60/13
Inventor 黄正宏於晓亮吕瑞涛沈万慈康飞宇
Owner TSINGHUA UNIV