Just in:
U.S. Compliance Takes Center Stage at OKX Following Industry Jitters // Sunshine’s Debut Features Leave Tech World Scratching Its Head // Ingdan Announces 2023 Annual Results // Samsung Partners National Heritage Board to Bring a Slice of Singapore’s Cultural Heritage to Samsung The Frame TV // Universal Language for Healthcare: General Authority Embraces Global Coding System // Infineon and HD Korea Shipbuilding & Offshore Engineering jointly develop ship electrification technology // Emirati Aid Reaches Ukraine as Food Shortages Bite // First-Ever Fortune Innovation Forum Draws Top Global Leaders to Hong Kong, Promoting Agendas On Collective Cross-Sector Advancement // Ajman Celebrates Conclusion of Ramadan Activities with Grand Ceremony // AIA Hong Kong Wins More Than 20 Accolades at MPF Ratings MPF Awards, BENCHMARK MPF of The Year Awards and Bloomberg Businessweek Top Fund Awards // No running of govt from jail, says Delhi Lt Governor // TUMI Hosts Global Launch Event in Singapore to Unveil Women’s Asra Collection and Announce Global Ambassador, Mun Ka Young // Konica Minolta is named ASEAN 2023 Market Leader in Colour Light and Mid Digital Production Printers // New Nylon Constant Torque Hinge From Southco Provides Position Control In A Compact Package // 2024 Lok Sabha Elections Will Be The Costliest One Till Now In The Whole World // Experience Ultimate Shopping Freedom at 4.4 Shopee Spree: Don’t Worry, Shop Shopee! // Lisboeta Macau’s world first LINE FRIENDS PRESENTS CASA DE AMIGO and BROWN & FRIENDS CAFE & BISTRO has officially opened // Global Audience to Witness Thrill of Dubai World Cup // Hope for Respite as UAE Endorses UN Plea for Gaza Truce // Melco Style Presents “SANRIO CHARACTERS STUDIO CITY CARNIVAL” – Explore a SANRIO World of Unlimited Love and Cuteness //
HomeTAP ResearchLiquid fuel for future computers

Liquid fuel for future computers

1489600293 liquidfuelfo

Three-dimensional chip stacks could be used in computers in the future. Integrated microscale flow batteries could both power and cool them. Credit: IBM Research Zurich

Researchers at ETH Zurich and IBM Research Zurich have built a tiny redox flow battery. This means that future computer chip stacks—in which individual chips are stacked like pancakes to save space and energy—could be supplied with electrical power and cooled at the same time by such integrated flow batteries. In a flow battery, an electrochemical reaction is used to produce electricity out of two liquid electrolytes, which are pumped to the battery cell from outside via a closed electrolyte loop.


“The chips are effectively operated with a liquid fuel and produce their own electricity,” says Dimos Poulikakos, Professor of Thermodynamics at ETH Zurich. As the scientists use two liquids that are known to be suitable both as flow-battery electrolytes and as a medium to also effect cooling, excess heat can also be dissipated from the chip stack via the same circuit.

ADVERTISEMENT

The battery built by the scientists is only around 1.5 millimetres thick. The idea would be to assemble chip stacks layer by layer: a computer chip, then a thin battery micro-cell that supplies the chip with electricity and cools it, followed by the next computer chip and so on.

Record-high output

ADVERTISEMENT

Previous flow batteries (see box) are usually large scale and used mainly in stationary energy storage applications, for instance in combination with wind farms and solar power plants, where they temporarily store the energy produced there so it can be used at a later time. “We are the first scientists to build such a small flow battery so as to combine energy supply and cooling,” says Julian Marschewski, a doctoral student in Poulikakos’ group.

The channel networks ensure that the liquid electrolytes fully penetrate the porous electrodes and react electrochemically. Credit: Marschewski et al. Energy and Environmental Science 2017, adapted

The output of the new micro-battery also reaches a record-high in terms of its size: 1.4 watts per square centimetre of battery surface. Even if you subtract the power required to pump the liquid electrolytes to the battery, the resulting net power density is still 1 watt per square centimetre.

As the researchers were able to show in an experiment, the electrolyte liquids are actually able to cool a chip. They are even able to dissipate heat amounts many times over what the battery generates as electrical energy (which is converted into heat while the chip is in operation).

Channel system optimised with 3D printing

According to the scientists, the most serious challenge in constructing the new micro-flow batteries was to build them in such a way that they are supplied with electrolytes as efficiently as possible while at the same time keeping the pumping power as low as possible. “It was important to find the ideal compromise,” says Marschewski.

The electrochemical reactions in the battery occur in two thin and porous electrode layers that are separated by a membrane. Marschewski and his colleagues used 3D-printing technology to build a polymer channel system to press the electrolyte liquid into the porous electrode layer as efficiently as possible. The most suitable of the various designs tested proved to be one made of wedge-shaped convergent channels.

3D-printed polymer channel walls (raised). The liquid electrolyte flows in the recesses. The enlarged image shows a 3 x 4 millimetre section. Credit: Marschewski et al. Energy and Environmental Science 2017

Interesting for large systems, too

The scientists have now provided an initial proof-of-concept for the construction of a small flow battery. Although the power density of the new micro-flow battery is very high, the electricity produced is still not entirely sufficient to operate a computer chip. In order for the flow battery to be used in a chip stack, it must be further optimised by industry partners.

As the scientists point out, the new approach is also interesting for other applications: in lasers, for example, which have to be supplied with energy and cooled; or for solar cells, where the electricity produced could be stored directly in the and used later when needed. The system could also keep the operating temperature of the solar cell at the ideal level. In addition, large flow batteries could also be improved with the optimised approach of forcing the electrolyte liquids through the porous electrodes.

Flow batteries

Batteries store energy in chemical form and convert it into electricity through electrochemical reactions. In conventional (ion) batteries, the energy is stored in two fixed electrodes; but in flow batteries, it is stored in two liquid electrolytes, which are pumped into the in two separate circuits. “Flow batteries are in principle rechargeable fuel cells,” explains ETH doctoral student Julian Marschewski. But while fuel cells can only convert chemical energy into electrical energy, flow batteries can convert into both directions.

For conventional batteries, the more they store, the larger and heavier they are. In flow batteries, the electrolyte liquids (i.e. the fuel) can be supplied from outside. One advantage is that the cells of the flow batteries can be designed smaller and lighter. A disadvantage, however, is that flow batteries require a liquid supply system.


Explore further:
A marriage made in sunlight: Invention merges solar with liquid battery

More information:
Julian Marschewski et al, 3D-printed fluidic networks for high-power-density heat-managing miniaturized redox flow batteries, Energy Environ. Sci. (2017). DOI: 10.1039/c6ee03192g

Source link

ADVERTISEMENT

ADVERTISEMENT
Just in:
Samsung Partners National Heritage Board to Bring a Slice of Singapore’s Cultural Heritage to Samsung The Frame TV // 2024 Lok Sabha Elections Will Be The Costliest One Till Now In The Whole World // French Leaders Gather for Interfaith Iftar Dinner // Emirates Post Speeds Up Deliveries for GCC with Special Day // Melco Style Presents “SANRIO CHARACTERS STUDIO CITY CARNIVAL” – Explore a SANRIO World of Unlimited Love and Cuteness // Universal Language for Healthcare: General Authority Embraces Global Coding System // CABSAT 2024 Ushers in 30 Years of Media Innovation // Andertoons by Mark Anderson for Thu, 28 Mar 2024 // Hope for Respite as UAE Endorses UN Plea for Gaza Truce // Arvind Kejriwal Was Used By BJP In 2011 Movement To Take On The Congress // New Nylon Constant Torque Hinge From Southco Provides Position Control In A Compact Package // Lisboeta Macau’s world first LINE FRIENDS PRESENTS CASA DE AMIGO and BROWN & FRIENDS CAFE & BISTRO has officially opened // Global Audience to Witness Thrill of Dubai World Cup // No running of govt from jail, says Delhi Lt Governor // First-Ever Fortune Innovation Forum Draws Top Global Leaders to Hong Kong, Promoting Agendas On Collective Cross-Sector Advancement // Sharjah Chamber Breaks Ground on Final Expansion with New HQ Pact // Emirati Aid Reaches Ukraine as Food Shortages Bite // US reiterates concern over Kejriwal arrest, Cong accounts // German Job Market Resilience Bodes Well for Economic Recovery // Sunshine’s Debut Features Leave Tech World Scratching Its Head //