United States: New iron-air battery can store renewable energy
According to a recent report by the Physicists Organization Network, a research team at the University of Southern California’s School of Arts and Sciences has developed an iron-air battery that is low-cost, environmentally-friendly, and can be used to store energy in solar and wind power plants during rainy days. The results of relevant studies are published in the latest issue of the American Electrochemistry Society.
Recently, California Governor Jerry Brown signed a bill that requires that one-third of the state's electricity supply must come from renewable energy sources by 2020, including geothermal, solar, and wind power. Then, in cloudy or almost windless weather, people still need electricity, and solar and wind power plants will need large capacity batteries to store large amounts of energy. For utilities, batteries often don't have a viable solution: Normal sealed batteries built into TV remote controls are generally not rechargeable; rechargeable lithium-ion batteries used in mobile phones and laptops are less expensive than iron-air. The battery is at least 10 times more expensive.
An iron-air battery is a high-energy battery in which oxygen in the air is used as a positive electrode active material and iron is used as a negative electrode active material. The electrolyte is an aqueous solution, and since the air is not calculated within the weight of the battery, it has a higher specific energy. The school’s Professor of Chemistry at the School of Arts and Sciences Sri Lanka Narayan led the research team to develop this kind of “breathing†battery in the air, using the chemical energy generated by the oxidation of iron plates exposed to the air by oxygen, similar to that of iron. Rust process. Narayan said: “The iron is cheap and the air is free. This is the future trend of the battery. The battery currently developed has the ability to store 8 hours to 24 hours of energy. The federal government and the California Public Utilities The department is interested in this project."
Iron-air batteries have been developed for several decades. In particular, after the energy crisis in the 1970s, people’s interest in R&D has increased dramatically. However, there is a huge problem in the R&D process: the intense chemical reaction (known as hydrolysis) that generates hydrogen inside the battery will draw about 50% of the battery energy, thereby greatly reducing its efficiency.
The research team managed to reduce the energy loss to 4%, making this iron-air battery more efficient by about 10 times than the previous battery. The researchers added a very small amount of bismuth sulphide to the battery, and plutonium could curb the energy wasted during hydrogen production.
Narayan said: “If you add lead or mercury, you may also improve the efficiency of the battery, but that will not be a safe practice. Very few antimony sulfides will not affect our commitment to environmentally friendly batteries.†The research team also Will continue to study, try to use less material to allow the battery to store more energy. (Hua Ling)
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