News


Graphene helps Li-Ion batteries charge faster

18 August 2010 News

Battery performance and form factors have been major constraints in the development of handheld computing and communication devices.

There is intense demand for ever-greater charge densities and cycle stabilities from the consumer electronics industry and lithium-ion technology, the leading technology option for such devices, has struggled to keep up. A major challenge has been the trade-off in battery design between higher capacity and recharge speed, which has imposed fundamental limitations on the performance of such batteries.

Now, novel battery materials developed at the Pacific Northwest National Laboratory (PNNL) of the Department of Energy and Vorbeck Materials, could enable lithium-ion batteries used in a wide range of applications from electric vehicles to cellphones to recharge in minutes rather than hours.

Researchers at PNNL, in collaboration with researcher Ilhan Aksay at Princeton University and Vorbeck Materials, have demonstrated that small quantities of graphene can improve the power and cycling stability of lithium-ion batteries dramatically without significant impact on their energy storage capacity. This discovery could enable designers to work around the traditional trade-off between capacity and power. The researchers believe that the new battery materials with graphene could cut recharge time to less than 10 minutes from the current norm of two to five hours for full recharge of cellphone batteries.

Vorbeck Materials licensed its method for making crumpled or defective graphene in large quantities from Aksay, a professor of chemical engineering at Princeton University in 2006, and have targeted a number of applications. They make conductive inks based on graphene to print extremely low-cost radio frequency identification (RFID) antennas and electrical contacts for flexible displays, and have an agreement with BASF, the German chemicals specialist.

The graphene-based ink is significantly cheaper than competing silver-based inks, although it has less conductivity. Moreover, the graphene-based inks, unlike the silver-based alternative, do not require heat treatment and therefore can be printed on to polymer substrates.

The newly patented method to manufacture defective graphene involves oxidisation of graphite with acids and their separation into atom-thin sheets. The sheets of expanded graphite are forced apart by rapid heating, causing carbon dioxide build-up. The sheets are then heated to remove the oxygen groups. According to Aksay, the conductivity is close to that of pure graphene, but the sheets are crumpled so they do not stack together again. His research group developed monitoring methods to improve the yield and ensure complete separation of graphene sheets, enabling rapid commercialisation. Vorbeck markets this unique graphene material under the brand name Vor-x.

For more information contact Patrick Cairns, Frost & Sullivan, +27 (0)18 464 2402, [email protected], www.frost.com





Share this article:
Share via emailShare via LinkedInPrint this page

Further reading:

Components distribution slowdown Q1 2025
News
European components distribution (DMASS) experienced a continued slowdown in the first quarter 2025.

Read more...
Semiconductor sales increase 17% YoY
News
The Semiconductor Industry Association (SIA) recently announced global semiconductor sales were $54,9 billion during the month of February 2025, an increase of 17,1% compared to the February 2024 total.

Read more...
Silicon Labs – Q1 results
News
Silicon Labs, a leading innovator in low-power wireless, recently reported financial results for the first quarter, which ended April 5, 2025.

Read more...
Strengthening industry through strategic partnerships at KITE 2025
Specialised Exhibitions News
The KwaZulu-Natal Industrial Technology Exhibition is not just an exhibition, it is a powerhouse of industry collaboration where visitors and exhibitors gain access to authoritative insights, technical expertise, and high-impact networking opportunities.

Read more...
Solar Youth Project calls on industry to step up
News
With the second cohort completed training and the first cohort returning for their final module, host companies are urgently needed to turn the training into a long-term opportunity.

Read more...
Conlog powers SA’s future with national smart meter rollout
News
Conlog recently secured the RT29-2024 contract from National Treasury, which is seen to be a major milestone towards modernising SA’s utility infrastructure.

Read more...
Zuchongzhi-3 sets new benchmark
News
This latest superconducting quantum computing prototype features 105 qubits and 182 couplers to operate at a speed 10¹5 times faster than the most powerful supercomputer currently available.

Read more...
Automatic device attestation certificate for Panasonic
News
DigiCert recently announced it has partnered with Panasonic Industry Europe to integrate DigiCert Device Trust Manager with Panasonic’s PAN-MaX intelligent manufacturing service for seamless Matter certification of interoperable smart home devices.

Read more...
From the editor's desk: Are we really being ripped off?
Technews Publishing News
To the surprise of many customers, installing solar panels does not always eliminate their utility bill – and in some cases, the power utility may impose additional charges on solar-powered homes.

Read more...
Winner of the Advanced Electronics Challenge
Avnet Silica News
Avnet Silica has named Hydronauten winner of the Advanced Electronics Challenge for breakthrough AI-driven vibration damping technology.

Read more...