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Sodium-ion hybrid batteries could recharge EVs in seconds

By combining traditional battery and supercapacitor tech, researchers have developed a super 'Frankenstein' battery that combines the best of both worlds.

Tibi PuiubyTibi Puiu
May 3, 2024
in Chemistry, Future, News
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Edited and reviewed by Zoe Gordon
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Battery AI illustration
Credit: AI-generated illustration/DALL-E 3.

Lithium-ion batteries have been paramount for mobile devices and renewable energy since the early 2000s. However, Li-ion technology has its limits and drawbacks, such as logistical bottlenecks due to a dependence on rare metals like cobalt and nickel. On the other hand, sodium-ion batteries — a rising star in energy storage tech — don’t rely on rare elements. Sodium itself is 500 times more abundant than lithium. It’s one part of table salt, after all.

Now, researchers have unveiled a new type of hybrid sodium-ion battery that uses cathodes from supercapacitors — electrochemical energy storage systems with great power density and extremely fast charge-discharge time.

Combining the best aspects of both batteries and supercapacitors

The novel system developed at the Korea Advanced Institute of Science and Technology (KAIST) not only charges rapidly but is also more affordable and safer than the lithium-ion batteries currently prevalent in consumer electronics and electric cars.

In a demonstration, a coin-shaped prototype of this hybrid sodium-ion battery charged “in seconds”, according to the researchers. This could be a game-changer, especially for the electric vehicle market where range anxiety has stymied adoption.

Traditionally, sodium-ion batteries have faced important limitations. They had lower power output, constrained storage properties, and longer charging times. Some of these limitations have now been solved by combining anode materials used in traditional batteries with cathodes found in supercapacitors.

However, this wasn’t as simple as mixing and matching some materials. The typically slow energy storage rate of battery-type anodes requires augmentation. And so does the relatively low capacity of the cathode materials.

The innovation lies in the synthesis of the battery components. The team, led by Professor Jeung Ku Kang from the Department of Materials Science and Engineering, utilized two different metal-organic frameworks to create optimized anode and cathode materials that address previous inefficiencies in energy storage rates.

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The resulting cell surpasses the energy density of current commercial lithium-ion batteries while retaining the characteristic power densities of supercapacitors, i.e. extremely fast charging. The findings were reported in the journal Energy Storage Materials.

Electrochemical characterizations of FS/C/G-20//ZDPC SIHES full cells (left). Ragone plots for FS/C/G-20//ZDPC (this work) and other previously reported sodium-ion electrochemical energy storage devices (right). Credit: KAIST Nano Materials Simulation and Fabrication Lab
The performance of the new hybrid sodium-ion batteries compared to conventional batteries and supercapacitors. Credit: KAIST Nano Materials Simulation and Fabrication Lab.

A potential game-changer

This advanced energy storage device is expected to have broad applications, notably in electric vehicles and various smart electronic devices. With an energy density of 247 Wh/kg and a power density of 34,748 W/kg, this development not only provides a viable alternative to lithium-ion batteries but also positions sodium-ion technology as a frontrunner in the race for more efficient, high-performance energy solutions.

Sodium-ion batteries in general are progressing in high gear. Last week, Natron Energy Inc. unveiled plans for the first large-scale plant in the United States for manufacturing sodium-ion batteries. The plant will be built close to Michigan’s western shore. BloombergNEF predicts that sodium-ion batteries will make up 12% of the market for stationary energy storage by 2030.

Elsewhere, in Japan, researchers at Osaka Metropolitan University have developed a new method for manufacturing solid-state sodium-ion batteries. The team made a solid sulfide electrolyte with the world’s highest reported sodium ion conductivity — about 10 times higher than required for practical use.

Tags: batterychargingelectronicssodium-ion battery

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Tibi Puiu

Tibi Puiu

Tibi is a science journalist and co-founder of ZME Science. He writes mainly about emerging tech, physics, climate, and space. In his spare time, Tibi likes to make weird music on his computer and groom felines. He has a B.Sc in mechanical engineering and an M.Sc in renewable energy systems.

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