Engineers use MoS2 nano sandwich to improve rechargeable batteries
Singer's research team discovered that the high lithium capacity of these flakes does not last long and will fall after five charges, a behavior similar to a lithium-sulfur battery which uses sulfur as one electrode. Singer added that they also discovered the high capacity lithium of these flakes doesn't last for long, and it will drop after five charges. "This behavior is similar with a sulfur-based lithium-sulfur batteries, which use sulfur as an electrode," Singer said. "It's well-known that sulfur dissolves in the organic electrolyte of the battery to form intermediate polysulfides which causes volume fading.
We believe the decrease in the sheet's capacity is due to the loss in sulfur in the electrolyte. Researchers wrapped the molybdenum-disulfide sheet with a layer of silicon carbonitride to reduce dissolution. Or in a ceramic layer of SiCN. Singh says that ceramics are glass-like high-temperature materials prepared by heating silicon-based liquid polymers. They have a higher chemical resistance than liquid electrolytes.
Singer explained the results after the experiment. The team examined the cells using an electron microscope. This proved that silicon carbitride could prevent chemical and mechanical degradation of liquid organic electrodes. Singer's team hopes to understand molybdenum diulfide batteries better. Electronic devices, such as cell phones, can be charged up to hundreds of time. Researchers will continue to test the molybdenum diulfide battery during the charging cycle in order to analyze and better understand how rechargeable batteries can be improved.
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