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New Catalyst Synthesis Paves The Way For Next-Gen Lithium-Air Batteries

July 30, 2023
in News
New Catalyst Synthesis Paves The Way For Next-Gen Lithium-Air Batteries
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The research team at Shibaura Institute of Technology efficiently synthesized CSO, a crucial catalyst for lithium-air batteries, using solution plasma in just 20 minutes.
The newly synthesized CSO showed superior catalytic properties for the oxygen evolution reaction (OER), which is critical for the performance of such batteries.
This efficient synthesis method for CSO opens up new possibilities for next-generation lithium-air batteries, contributing to the high functionalization of electric vehicles and helping to achieve carbon neutrality.

Shibaura Institute of Technology scientists have developed a faster, more efficient way to synthesize CoSn(OH)6, a powerful catalyst required for high-energy lithium – air batteries.

CoSn(OH)6 (CSO) is an effective oxygen evolution reaction (OER) catalyst, necessary for developing next-generation lithium – air batteries. However, current methods of synthesizing CSO are complicated and slow. The international research team at Shibaura synthesized CSO in a single step within 20 minutes using solution plasma to generate CSO nanocrystals with excellent OER catalytic properties. Their findings could boost the manufacturing of high energy density batteries.

It has become a world wide political policy to reduce fossil fuel dependency and switch to alternate green energy sources. The development of electric vehicles is a move toward that direction. However, electric vehicles require high energy density batteries for their functioning, and conventional lithium-ion batteries are not up to the task. Theoretically, lithium-air batteries provide a higher energy density than lithium-ion batteries. However, before they can be put to practical use, these batteries need to be made energy efficient, their cycle characteristics need to be enhanced, and the overpotential needed to charge/discharge the oxygen redox reaction needs to be reduced.

To address these issues, a suitable catalyst is needed to accelerate the oxygen evolution reaction (OER) inside the battery. The OER is an extremely important chemical reaction involved in water splitting for improving the performance of storage batteries. Rare and expensive noble metal oxides such as ruthenium(IV) oxide (RuO2) and iridium(IV) oxide (IrO2) have typically been used as catalysts to expedite the OER of metal-air batteries. More affordable catalytic materials include transition metals, such as perovskite-type oxides and hydroxides, which are known to be highly active for the OER. CoSn(OH)6 (CSO) is one such perovskite-type hydroxide that is known to be a promising OER catalyst. However, current methods of synthesizing CSO are slow (require over 12 hours) and require multiple steps.

In a recent breakthrough, the research team from Shibaura Institute of Technology in Japan, led by Prof. Takahiro Ishizaki along with Mr. Masaki Narahara and Dr. Sangwoo Chae, managed to synthesize CSO in just 20 minutes using only a single step! To achieve this remarkable feat, the team used a solution plasma process, a cutting-edge method for material synthesis in a nonthermal reaction field. Their research has been published in the journal Sustainable Energy & Fuels.

The team used X-ray diffractometry to show that highly crystalline CSO could be synthesized from a precursor solution by adjusting the pH to values greater than 10 to 12. Using a transmission electron microscope, they further noticed that the CSO crystals were cube-shaped, with sizes of about 100-300 nm. The team also used X-ray photoelectron spectroscopy to investigate the composition and binding sites of CSO crystals and found Cobalt (Co) in a divalent and Tin (Sn) in a tetravalent state within the compound.

Finally, the team used an electrochemical method to look at the properties of CSO as a catalyst for OER. They observed that synthesized CSO had an overpotential of 350 mV at a current density of 10 mA cm−2. “CSO synthesized at pH12 had the best catalytic property among all samples synthesized. In fact, this sample had slightly better catalytic properties than that of even commercial-grade RuO2,” highlights Prof. Ishizaki. This was confirmed when the pH 12 sample was shown to have the lowest potential, specifically 104 mV lower than that of commercially available RuO2 vs. reversible hydrogen electrode at 10 mA cm−2.

Overall, this study describes, for the first time, an easy and efficient process for synthesizing CSO. This process makes CSO practically effective for use in lithium-air batteries and opens a new avenue towards the realization of next-generation electric batteries.

“The synthesized CSO showed superior electrocatalytic properties for OER. We hope that the perovskite-type CSO materials will be applied to energy devices and will contribute to the high functionalization of electric vehicles,” Prof. Ishizaki concludes. “This, in turn, will bring us one step closer towards achieving carbon neutrality by enabling a new energy system independent of fossil fuels.”

***

It will be interesting to see if the lithium air technology can dent into the lithium ion tech of electric vehicle batteries. The ion version is slowly but surely adding up some not so good press about fires, failures and costs.

But the air technology is very new and the experience of thousands of battery sets out in the consumer market is yet to be built out.

Which one is best, safest, longest lasting and lowest cost before recycling is still quite a ways off.

By Brian Westenhaus via New Energy and Fuel

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