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Composite Electrode Material for Assembling Asymmetric Supercapacitor

Project overview
Supercapacitor is a kind of environmental energy storage devices, being widely used in energy storage and conversion. However, the relatively low energy density limits its practical applications. To catch up with the application requirement in future, it is imperative to exploit a supercapacitor with wide working voltage and high energy density, without sacrificing its power density and cycling life. So ICC-CAS assembled asymmetric supercapacitor, using activated carbon/ graphene composite with high specific surface area and electrical conductivity as cathode, and cobalt oxide/graphene with high capacity as cathode. This breaks through the technological bottleneck of the low energy density of supercapacitor.

 Technical Content

Firstly, we optimized the reaction time, reaction temperature and formula to obtain cobalt oxide/graphene composite with stable structure, high electrical conductivity and high capacity. Then we adjusted the activation ways and conditions to prepare activated carbon/graphene composite with proper pore size distribution, high specific surface area and high electrical conductivity. Finally, these two electrode materials were assembled to an asymmetric supercapacitor, which achieved the 1.5V working voltage, 40wh/kg energy density and excellent cycle performances. Coin cell and soft package were further developed by the matching of anode and cathode, the choose of electrolyte types and the optimizing of the packaging technology. Demonstration of lighting LED was displayed.

Advantages

High loading amount was realized by uniformly dispersing the cobalt oxide on graphene sheet, and the capacity performance of the composite was enhanced. This technology obtained coin cell and soft package with high energy density by optimizing the structure, mass and voltage of both electrode materials in asymmetric supercapacitor.

Technical Index

Graphene/activated carbon composite as cathode

Item

Index

Specific Surface Aream2/g

2000

Pore Sizenm

0.5~100

Working VoltageV

-1~0

Specific Capacity(three-electrode in aqueous solution, 1 A /g)F/g

150

 

Co3O4/graphene composite as anode

Item

Index

Specific Surface Area m2/g

100

Pore Sizenm

0.5~100

Working VoltageV

0~0.5

Specific Capacity(three-electrode in aqueous solution, 1 A/g)F/g

200

 

Power-mode symmetrical supercapacitor

Item

Index

Working VoltageV

0~1

Charging Times

50

Cycle Lifeafter cycling for 200,000 times

90%

Power DensityW/kg

10000

Energy DensityWh/kg

7

 

Asymmetric supercapacitor

Item

Index

Working voltageV

0~1.5

Charging timemin

3

Cycle lifeafter cycling for 3,000 times

90%

Power densityW/kg

3000

Energy densityWh/kg

15

 

 

Intellectual Properties

Four authorized patentsZL201510232487.0, ZL201611071556.5, ZL201510062450.8, ZL201510062117.7.

Market Prospects

According to the statistical data from DTechEX, the global market of supercapacitors was $ 1.1 billion in 2014. It is expected that the global market of supercapacitors will reach $ 3.5 billion in 2020. In future, supercapacitor will play important role in hybrid electric vehicles and new energy acquisition system.

Technology Maturity

Laboratory research and development.

Cooperation

Cooperative development.


 

 

Schematic of the structure of as-made asymmetric supercapacitor consisting of 3D Co3O4-RGO aerogel and hierarchically porous carbon electrodes

 

 

 

Cycling stability of as-made asymmetric supercapacitor consisting of 3D Co3O4-RGO aerogel and hierarchically porous carbon electrodes

 

 

Ragone plots of the symmetric supercapacitors of 3D Co3O4-RGO //3D Co3O4-RGO, HPC//HPC and the asymmetric supercapacitor of Co3O4-RGO//HPC. Inset shows a red LED powered by three asymmetric supercapacitors connected in series.

 

 

Achievements  

Composite Electrode Material for Assembling Asymmetric Supercapacitor

Supercapacitor is a kind of environmental energy storage devices, being widely used in energy storage and conversion. However, the relatively low energy density limits its practical applications. To catch up with the application requirement in future, it is imperative to exploit a supercapacitor with wide working voltage and high energy density, without sacrificing its power density and cycling life. So ICC-CAS assembled asymmetric supercapacitor, using activated carbon/ graphene composite with high specific surface area and electrical conductivity as cathode, and cobalt oxide/graphene with high capacity as cathode. This breaks through the technological bottleneck of the low energy density of supercapacitor.
 Technical Content

Firstly, we optimized the reaction time, reaction temperature and formula to obtain cobalt oxide/graphene composite with stable structure, high electrical conductivity and high capacity. Then we adjusted the activation ways and conditions to prepare activated carbon/graphene composite with proper pore size distribution, high specific surface area and high electrical conductivity. Finally, these two electrode materials were assembled to an asymmetric supercapacitor, which achieved the 1.5V working voltage, 40wh/kg energy density and excellent cycle performances. Coin cell and soft package were further developed by the matching of anode and cathode, the choose of electrolyte types and the optimizing of the packaging technology. Demonstration of lighting LED was displayed.

Advantages

High loading amount was realized by uniformly dispersing the cobalt oxide on graphene sheet, and the capacity performance of the composite was enhanced. This technology obtained coin cell and soft package with high energy density by optimizing the structure, mass and voltage of both electrode materials in asymmetric supercapacitor.

Technical Index

Graphene/activated carbon composite as cathode

Item

Index

Specific Surface Aream2/g

2000

Pore Sizenm

0.5~100

Working VoltageV

-1~0

Specific Capacity(three-electrode in aqueous solution, 1 A /g)F/g

150

 

Co3O4/graphene composite as anode

Item

Index

Specific Surface Area m2/g

100

Pore Sizenm

0.5~100

Working VoltageV

0~0.5

Specific Capacity(three-electrode in aqueous solution, 1 A/g)F/g

200

 

Power-mode symmetrical supercapacitor

Item

Index

Working VoltageV

0~1

Charging Times

50

Cycle Lifeafter cycling for 200,000 times

90%

Power DensityW/kg

10000

Energy DensityWh/kg

7

 

Asymmetric supercapacitor

Item

Index

Working voltageV

0~1.5

Charging timemin

3

Cycle lifeafter cycling for 3,000 times

90%

Power densityW/kg

3000

Energy densityWh/kg

15

 

 

Intellectual Properties

Four authorized patentsZL201510232487.0, ZL201611071556.5, ZL201510062450.8, ZL201510062117.7.

Market Prospects

According to the statistical data from DTechEX, the global market of supercapacitors was $ 1.1 billion in 2014. It is expected that the global market of supercapacitors will reach $ 3.5 billion in 2020. In future, supercapacitor will play important role in hybrid electric vehicles and new energy acquisition system.

Technology Maturity

Laboratory research and development.

Cooperation

Cooperative development.


 

 

Schematic of the structure of as-made asymmetric supercapacitor consisting of 3D Co3O4-RGO aerogel and hierarchically porous carbon electrodes

 

 

 

Cycling stability of as-made asymmetric supercapacitor consisting of 3D Co3O4-RGO aerogel and hierarchically porous carbon electrodes

 

 

Ragone plots of the symmetric supercapacitors of 3D Co3O4-RGO //3D Co3O4-RGO, HPC//HPC and the asymmetric supercapacitor of Co3O4-RGO//HPC. Inset shows a red LED powered by three asymmetric supercapacitors connected in series.

 

 

上一篇:Lithium-Sulfur Batteries
下一篇:Supercapacitor

CONTACT US


Sales Manager:

0086+18835170493(Miss. Liu)

18835170493@163.com

WeChat:18835170493


Technical support:

0086+13934640625(Miss. Guo)

graphene@sxicc.ac.cn

WeChat:13934640625


Tel/Fax:0086+03514049061
Post Code:030001

Adress:27 South Taoyuan Road, Taiyuan, Shanxi, P.R.China

Website:http://709.sxicc.ac.cn

0351-4049061

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