Researchers say they have developed what they say is a safe and cheaper alternative to lithium-ion batteries (LIBs).
The team say the ability to create automatic conversion of hydrogen gas into water will make the breakthrough aqueous rechargeable batteries safer.
The use of lithium Ion batteries is increasing with the move to electric vehicles and from marine insurers to vehicle manufacturers there are concerns over the risk of LIBs exploding or igniting materials amid overheating concerns.
The team led by Dr Oh, Si Hyoung of the Energy Storage Research Centre at the Korea Institute of Science and Technology (KIST) has developed a highly safe aqueous rechargeable battery that they say offers “a timely substitute” that meets the cost and safety needs. Despite of lower energy density achievable, aqueous rechargeable batteries have a significant economic advantage as the cost of raw materials is much lower than LIBs. However, inveterate hydrogen gas generated from parasitic water decomposition causes a gradual rise in internal pressure and eventual depletion of the electrolyte, which poses a sizeable threat on the battery safety, making commercialisation difficult.
“This summer, the planet is suffering from unprecedented heat waves and heavy rainfalls,” the team explained. “Developing renewable energy and expanding associated infrastructure has become an essential survival strategy to ensure the sustainability of the planet in crisis, but it has obvious limitations due to the volatility of electricity production, which relies on uncertain variables like labile weather conditions.
“For this reason, the demand for energy storage systems (ESS) that can store and supply electricity as needed is ever-increasing, but LIBs currently employed in ESS are not only highly expensive, but also prone to potential fire, so there is an urgent need to develop cheaper and safer alternatives.
They explained until now, researchers have often tried to evade this issue by installing a surface protection layer that minimises the contact area between the metal anode and the electrolyte. However, the corrosion of the metal anode and accompanying decomposition of water in the electrolyte is inevitable in most cases, and incessant accumulation of hydrogen gas can cause a potential detonation in long-term operation.
To cope with this critical issue, the research team has developed a composite catalyst consisting of manganese dioxide and palladium, which is capable of automatically converting hydrogen gas generated inside the cell into water, ensuring both the performance and safety of the cell. Manganese dioxide does not react with hydrogen gas under normal circumstances, but when a small amount of palladium is added, hydrogen is readily absorbed by the catalysts, being regenerated into water. In the prototype cell loaded with the newly developed catalysts, the internal pressure of the cell was maintained well below the safety limit, and no electrolyte depletion was observed.
“The results of this research effectively solves one of the most concerning safety issues in the aqueous batteries, making a major stride towards commercial application to ESS in the future. Replacing LIBs by cheaper and safer aqueous batteries can even trigger a rapid growth of global market for ESS,” it added.
“This technology pertains to a customised safety strategy for aqueous rechargeable batteries, based on the built-in active safety mechanism, through which risk factors are automatically controlled.” said Oh. “Moreover, it can be applied to various industrial facilities where hydrogen gas leakage is one of major safety concerns (for instance, hydrogen gas station, nuclear power plant etc) to protect public safety.”