Lithium-liquid polysulfide mobile battery achieves "regeneration"
Science and Technology Daily, Beijing, September 12th (Reporter Jiang Jing) Lithium-liquid polysulfide mobile batteries are theoretically suitable for large-scale energy storage in the power grid. However, the capacity of such batteries is easily reduced during the cycle and cannot be used. Over the years, Professor Cui Yi's group at Stanford University in the United States recently found a "regeneration" technique for recovering capacitors, which is expected to solve the large-scale energy storage problem of the power grid.
A paper published by the research group in the journal Nature Communications states that lithium-liquid polysulfide mobile batteries that use lithium metal as the negative electrode and liquid polysulfide as the positive electrode have high energy density, low energy storage costs, and flowability. And other advantages, however, during the charge and discharge process, the liquid polysulfide therein is converted into solid polysulfide and precipitated, forming "dead polysulfide fragments", which causes the capacity to decrease during the battery cycle and cannot be truly applied to large-scale energy storage in the power grid. The research could bring polysulfide fragments back to life.
Researchers told the Science and Technology Daily reporter that the so-called "regeneration" is to allow the added sulfur powder to react with "dead sulfur fragments" under heating and stirring to convert solid low-order polysulfide into liquid high-order polysulfide. Thereby recovering the lost capacity of the battery. In an actual lithium-liquid polysulfide flow system, "regeneration" is performed once in a while, so that the entire system can continue to run stably and have a high energy density. The research team set up a lithium-liquid polysulfide mobile battery energy storage system and conducted a cycle test. The sulfur load content used in single cells is as high as grams, which is much higher than the sulfur load of general test batteries, and can run stably.
With its high energy density, low energy storage cost, and safety characteristics, the lithium-liquid polysulfide energy storage battery system has a good application prospect in future large-scale energy storage at the grid level, and it is expected to reduce energy storage costs to $ 100 / Below kWh.
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