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					</table><p>A team of researchers from the <a href="https://www.adelaide.edu.au/front/international?adobe_mc_sdid=SDID%3D2F428E5D29EC5CDA-75536E5835AA1042%7CMCORGID%3DBA023B045D5A83160A495E49%40AdobeOrg%7CTS%3D1705987186&amp;adobe_mc_ref=https%3A%2F%2Fwww.adelaide.edu.au%2Ffront%2Finternational" target="_blank" rel="noopener">University of Adelaide</a> in Australia and the <a href="https://umd.edu/" target="_blank" rel="noopener">University of Maryland</a> in the U.S. have developed a new type of aqueous sodium-ion battery that they claim can last for over 13,000 charge cycles, overcoming a key limitation of aqueous batteries: water decomposition.</p>
<p>The findings, published in the journal <a href="https://www.nature.com/articles/s41467-024-44855-6" target="_blank" rel="noopener">Nature Communications</a>, show that the researchers created an alkaline, rather than neutral, electrolyte that suppresses water splitting into oxygen and hydrogen.</p>
<p>Traditional aqueous batteries, like lead-acid batteries, contain water-based electrolytes. While safe and low-cost, a downside is that the water can decompose during battery cycling, producing hydrogen gas that limits battery lifespan and poses safety risks.</p>
<p>However, alkaline conditions can trigger corrosion of the battery cathode. To prevent this, the researchers coated the cathode with nickel/carbon nanoparticles, which created a locally acidic environment at the cathode surface to mitigate corrosion.</p>
<p>The nickel coating had another benefit &#8211; some nickel atoms embedded into the cathode, reinforcing its structure against degradation. This combination of the tailored alkaline electrolyte and nickel-carbon coating led to the coin cell battery maintaining 85% of its initial capacity after 1,000 charge/discharge cycles.</p>
<p>The alkaline solution is also cheaper than current methods to boost water stability, which contains expensive fluorine salts and the addition of potentially flammable co-solvents to the electrolyte to reduce water activity.</p>
<p>According to the researchers, the aqueous sodium-ion battery demonstrated an energy density of 90 Wh/kg, which is good for an aqueous battery but still lower than the 120-260 Wh/kg seen in lithium-ion batteries. However, unlike lithium, sodium has a high natural abundance on the planet, which helps lower costs.</p>
<p>The researchers believe it could enable large-scale energy storage to support renewables and electric vehicles if it can be successfully commercialized. It could also be useful for underwater electronics due to its safety and long lifetime.</p>
<p>There is research in other sodium-ion battery chemistries emerging to address the challenges in performance and cost. Pune-headquartered KPIT Technologies in December <a href="https://www.mercomindia.com/india-based-kpit-unveils-ion-battery-technology" target="_blank" rel="noopener">unveiled</a> a sodium-ion battery technology with 80% capacity retention for 3,000-6,000 cycles and energy density ranging from 100-170 Wh/Kg.</p>
<p>In May, scientists at the Indian Institute of Technology Bombay <a href="https://www.mercomindia.com/iit-researchers-make-headway-sodium-ion-batteries" target="_blank" rel="noopener">claimed</a> a breakthrough in developing sodium-ion batteries by addressing the challenges of air/water instability and structural-cum-electrochemical instability in cathode materials.</p>


New Sodium-Ion Battery For Cheaper Large-Scale Energy Storage

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