With the ever increasing use of portable devices with batteries the biggest issue with most mobile devices is their requirement to be constantly recharged.
However, engineers have found graphene anodes are better at holding energy than anodes made of graphite — with faster charging up to 10x — researchers have been hard at work experimenting with graphene compounds that can be scalable, cost-efficient, but most of all, powerful.
Recently Rice University researchers found graphene mixed with vanadium oxide (a relatively inexpensive solution) can create battery cathodes that recharge in 20 seconds and retain more than 90% of their capacity, even after 1,000 cycles of use.
First Graphite is embarking on a project to earn a controlling interest in the private company which has been working with Swinburne University of Technology to advance a radically new energy storage device – the graphene-oxide based supercapacitor (“the BEST Battery”).
At the end of the project it is aimed to have developed the prototype for a high performance and manufacturable graphene or graphene oxide thin-film energy storage device which can be integrated into a wide range of products, providing faster charging speed and a stable, clean energy source. It would be especially suitable for small electronic devices, such as those that currently use AA style batteries, but could also eventually provide reliable energy storage for a wide range of applications.
The table below provides a simple comparison of what the parties believe the BEST battery could achieve compared to the standard lithium-ion battery, based on laboratory test work undertaken to date.
|Parameters||Supercapacitor (BEST Battery)||AA Rechargeable battery|
|Charge time||1-10 seconds||1-4 hours|
|Cycle life||Minimum 10,000 cycles||300-1,000 cycles|
|Cell voltage||1.5 to 2.3 V||1.25 – 1.5 V|
|Energy density (Wh./L)||5 (current state)|
50-60 (target for this project)
|100 to 200|
|Power density (W/L)||Up to 10,000||35 to 300|
|Cost per Wh.||$20 (current state)|
$0.30 (target for this project)
|$0.50-$1.00 (large system)|
|Service life||10-15 years||1 to 2 years|
|Disposal||No special requirement, environmentally friendly||Land fill, harmful to environment|
Table 1: Overall comparison of existing supercapacitor with Lithium-ion battery