American University developed the first carbon-neutral lithium-carbon dioxide battery with energy density 7 times higher than that of lithium batteries
According to foreign media reports, Lithium-carbon dioxide batteries are a very attractive energy storage system because they have more than seven times higher energy density compared to commonly used lithium-ion batteries. However, although lithium-carbon dioxide batteries have the ability to store more energy, until now, no scientists have developed a rechargeable lithium-carbon dioxide battery prototype.
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Now, for the first time, researchers at the University of Illinois at Chicago have demonstrated that lithium-carbon dioxide batteries can be engineered to operate in a rechargeable manner, and they have successfully tested a lithium-carbon dioxide battery prototype , which can be continuously charged and discharged for 500 times.
Traditionally, when a lithium-carbon dioxide battery is discharged, it produces lithium carbonate and carbon, which is recycled during charging, but the carbon just builds up on the catalyst, eventually causing the battery to fail. Alireza Ahmadiparidari, a graduate student in UIC’s School of Engineering and the paper’s first author, said: “The buildup of carbon not only hinders the catalyst’s active sites, preventing the diffusion of carbon dioxide, but also allows the electrolyte to decompose during charging.”
Amin Salehi-Khojin, associate professor of mechanical and industrial engineering in UIC’s School of Engineering, and colleagues employed new materials in a carbon dioxide experimental battery to facilitate the ability to fully recycle lithium carbonate and carbon together during charging. They used molybdenum disulfide as a cathode catalyst, combined with a mixed electrolyte to help contain carbon during cycling.
Specifically, the researchers combined various materials to produce a single multi-ingredient composite product rather than a single product, making the recycling process more efficient.
Salehi-Khojin said: “The unique combination of materials has helped us create the first carbon-neutral lithium-carbon dioxide battery with higher efficiency and longer cycle life for advanced energy storage systems such as V2G technology to balance electricity demand.”