A new type of "breathable" sodium-co2 battery has been successfully developed

China Paint Online reporter learned on the 16th, Nan kai University School of Chemistry Chen Jun academician task force using cheap sodium carbonate and carbon nano-control to prepare a sodium-free pre-filled "breathable" sodium-carbon dioxide battery. The results became the first published article in the journal Research.
, the primary version of the "breathable" battery is a lithium-oxygen battery that gets oxygen from the air when discharged and then releases oxygen when charging, so it is called a "breathable" battery . The resulting sodium-CO2 battery is generally negative with metal sodium, carbon and other materials as the positive pole, when discharged from the outside world to obtain carbon dioxide, charging and then emit carbon dioxide. Compared with lithium-oxygen batteries, these batteries are rich in raw materials, easy to prepare, and also resource-based use of carbon dioxide gas to achieve sustainable green development.
At present, there is a major difficulty in the development of sodium-co2 batteries: excessive metal sodium negative extremely easy to form branch crystals, resulting in short-circuited batteries bring safety hazards, and metal sodium preparation is mainly through electrolyte molten sodium chloride or sodium hydroxide, energy pollution. Chen Jun's task force overcomes the difficulties of poor conductivity of sodium carbonate, so dissolves and parses the method to prepare a cheap composite material of sodium carbonate on the surface of multi-walled carbon nanotubes, and as a positive pole, conductive carbon as a negative pole, for the first time to build a sodium-free pre-filled "breathable" sodium-carbon dioxide battery. The battery through the charging capacity control can successfully inhibit the formation of branch crystals, security is greatly enhanced, after testing in the intercept capacity of 0.3mAh/cm2 conditions, after a cycle of 100 laps can still ensure that the charging voltage is less than 4V, the team has assembled a capacity of 350mAh, energy density of 183Wh/kg (based on the entire battery quality) of the single battery.
Sodium carbonate is easy to prepare in industry, carbon is widely available in nature, Chen Jun's research results avoid the pre-filling of negative metal sodium, can effectively reduce the safety risks of batteries, for the safety of battery design provides a new way of thinking. In addition, the Martian atmosphere contains 95 percent carbon dioxide, a sodium-free pre-filled "breathable" sodium-CO2 battery that promises to provide a potential electrochemical energy system for Mars exploration.
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