Hyper capacitor with electrodes based on cobalt oxide nanowires : 81 Wh/kg

hypercapa nanowires

Hypercapacitor nanowires with brush-like

The electrodes of high density supercapacitor are usually made from conductive carbon mixed with a transition metal oxide. This mixture is then coated on a collector with a high power electric current conductor such as carbon cloth, copper or nickel. This approach often limits access of the electrolyte to the entire volume of the electrode and the surface boundary where redox reactions can take place.

A team of researchers at the King Abdullah University of Science and Technology (KAUST) in Saudi Arabia led by Husam N. Alshareef therefore used a different approach to improve device performance.

"We designed the electrode with macroporosity to help electrolyte flow and with mesoporosity to increase oxide surface area and increase the redox reaction rate", said Alshareef.

Read more Hyper capacitor with electrodes based on cobalt oxide nanowires : 81 Wh/kg

Hypercapacitor based on Graphene Composites : 77.8 Wh/kg

hyper capacitor graphene composite

Graphene composite used for the creation of a hyper capacitor

Basically, a supercapacitor is composed of two electrodes, a porous membrane and an electrolyte. The energy and the power of supercapacitors depends particularly on the tension between the two electrodes in the electrolyte. However, the supercapacitors voltage reached 2.7 volts for acetonitrile based electrolytes which is unfortunately a toxic solvent and only 0.8 to 1 volt for aqueous electrolytes that are more environmentally friendly.

To improve performance and especially the density of energy stored by a supercapa, some researchers are therefore working on asymmetric super capacitors which two electrodes are made of different materials, which increases the tension.

A team of researchers led by Fan Zhuangjun Harbin Engineering University, Linjie Zhi at the National Center for Nanoscience and Fei Wei at Tsinghua University in China have created an asymmetric hypercapacitor based on a nickel hydroxide - graphene composite positive electrode and a porous graphene negative electrode.

Read more Hypercapacitor based on Graphene Composites : 77.8 Wh/kg

Hyper capacitor : super battery that can charging super fast

hyper capacitor super fast battery

Hyper capacitor : the super fast battery

A capacitor is an electronic component that is a passive two-terminal electrical component used to store energy in an electric field. A capacitor is used to stabilize a power supply, to filter periodic signals or to block direct current while allowing alternating current to pass.

A super capacitor (or ultra capacitor) is an electrochemical capacitor with relatively high energy density energy. A super capacitor can store hundreds of times greater energy than conventional electrolytic capacitors, but store less energy than a battery.

A hyper capacitor is an high energy density supercapacitor that can store as much electricity as a battery. A supercapacitor can be described as a hypercondensateur when its energy density is greater than or equal to 50 Wh per kg.

The hyper capacitor is therefore akin to a super fast battery which also has a long life. Technically, the hypercondensateur is not a battery because the energy storage is not done by chemical reaction. A hypercondensateur stores an electrical charge directly between a positive electrode and a negative electrode separated by a porous insulating membrane. It's any static electricity that is stored and can be released much faster than in a battery where electricity comes from a chemical reaction necessarily much slower.

The hypercapacitor is not a myth, several laboratories have succeeded in creating hyper capacitors with energy densities ranging from 50 Wh per kg to 155 Wh per kg ! It's more than lithium-ion batteries currently available commercially.

The hyper capacitor is not yet ready for commercialization. Several techniques have been directed to the energy density required, but to arrive at a stage of industrial production there remain a number of issues to be resolved.

On www.hyper-capacitor.com you can find informations about hypercapacitors with technological advances and techniques used by laboratories to create these high-density supercapacitors. Perhaps soon we will also discuss the development and industrial production of the first uses of this ultimate energy storage solution resembling a super fast battery.