Supercapacitors

Graphene ESD and Stony Brook University sign a research agreement for development of a graphene-based supercapacitor

Graphene ESD logoLomiko Metals recently announced forming a new graphene-related venture called Graphene Energy Storage Devices (Graphene ESD Corp.) to commercialize their energy storage technology. Now, Lomiko has announced the signing of a research agreement between Graphene ESD and Stony Brook University.

Graphene ESD Corp. will partner with the SBU Center for Advanced Sensor Technologies (Sensor CAT) to develop new supercapacitors designed for energy storage. The device will be designed as a versatile energy storage solution for electronics, electric vehicles and electric grid. SBU will leverage its experience in electrochemistry and will be responsible for the design of the electrode and the electrolyte formulation. The Graphene ESD team will work on device assembly and testing.

A novel approach to crumpling graphene using a thermally activated polymer substrate

Researchers at the University of Illinois at Urbana-Champaign developed a single-step process to achieve 3D texturing of graphene and graphite, using a commercially available thermally activated shape-memory polymer substrate. 

crumpling method for graphene and graphite illinois urbana-chamaign image

Since crumpled graphene was shown to have modulated electrical and optical properties, finding methods to produce folded/crumpled graphene surfaces can be helpful for various applications, like electronics and biomaterials, electrodes for battery and supercapacitor applications, coating layers, omniphobic/anti-bacterial surfaces for advanced coating applications and more. 

Graphene-based capacitors demonstrated in electric bicycles

Researchers from Qingdao Institute of Bioenergy and Bioprocess Technology (QIBEBT) of the Chinese Academy of Sciences have developed high performance LICs (lithium ion capacitors) using graphene- based composites as electrodes. 

The researchers also developed LICs with a capacity of 150F, 1000F, 2000F and 3500F. The energy densities are above 45 Wh/L based on the volume of the cell. After 20,000 cycles of charge/discharge, the ratio of the capacity retention is as high as 84.3%.

Rice Scientists use LIG process to make 3D graphene supercapacitors

In December 2014, Rice University researchers designed a process (called LIG) in which  a computer-controlled laser burns through a polymer to create flexible, patterned sheets of multilayer graphene that may be suitable for electronics or energy storage.

Now, their research has advanced to use the LIG process to produce 3D supercapacitors. The scientists made supercapacitors with laser-induced graphene on both sides of a polymer sheet. The sections were stacked with solid electrolytes in between, to get a multilayer construct with multiple micro-supercapacitors. 

rice lig supercapacitor schematic

Graphene from agricultural waste

Researchers at the South Dakota State University agricultural and biosystems engineering department used a pyrolysis process to turn various materials (corn stover, dried grains and grasses) into graphene. The pyrolysis process turns the plant materials into bio-oil and biochar, and further processing turns it into biofuel.

Turning biochar into graphene can have many uses, like replacing activated carbon coatings of electrodes used in supercapacitors. Graphene has a much higher monetary value than the plant products in this process, so it can be highly worhtwhile to turn these agricultural residues into graphene. 

Talga cooperates with German researchers to explore graphene energy-related applications

Talga Resources logoTalga has entered into a joint work program with Dresden University of Technology and the Max Planck Institute, to test and develop low cost bulk graphene production for supercapacitor and battery related applications. 

This 12 month research program aims to test and demonstrate the company's low cost bulk graphene product for supercapacitor and other battery related applications. Professor Feng from Dresden University will head the joint work program alongside Professor Klaus Müllen at Max Planck. Both Professors Müllen chair research clusters within the €1 billion Graphene Flagship program.

Korean scientists design unique method for making pompom-like graphene particles

Korean Scientist at the university of Yonsei in Seoul and the Korean Institute of Ceramic Engineering & Technology designed round graphene microparticles by spraying graphene oxide droplets into a hot solvent. This technique could pose a versatile and simple approach to making electrode materials for batteries and supercapacitors with improved energy and power densities.

Korean scientists pompom graphene image

The researchers' particles comprise of graphene nanosheets radiating out from the center, an arrangement that increases the exposed surface area of the graphene and creates open nanochannels that can enhance charge transfer. The work was doen by passing an aqueous suspension of graphene oxide flakes through an ultrasonic nozzle, which uses sound waves to break the suspension into microdroplets. The scientists then sprayed the droplets downward into a 160° C mixture of organic solvent and ascorbic acid, a reducing agent. The hot mixture allows the graphene oxide to reduce to graphene sheets that cluster together. The water in the droplets evaporates and escapes toward the surface, which causes the unique arrangement of the nanosheets. 

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