Recently, the University of Science and Technology of China announced the development of a new sulfide solid electrolyte for all-solid-state batteries. This material not only has the inherent advantages of sulfide solid electrolytes, but is also cheaper and more suitable for commercialization than other sulfide solid electrolytes. ​​​

According to information, the reason for the high cost of sulfide solid electrolytes is that their synthesis requires the use of a large amount of expensive lithium sulfide (not less than US$650 per kilogram). Ma Cheng, a professor at the University of Science and Technology of China, developed a sulfide solid electrolyte that does not use lithium sulfide as a raw material - lithium phosphorus oxysulfide. This solid electrolyte is synthesized from low-cost hydrated lithium hydroxide and phosphorus sulfide as raw materials. Its cost is only US$14.42 per kilogram, less than 8% of the cost of other sulfide solid electrolyte raw materials, and far lower than the US$50 per kilogram. Commercialization requirements, strong cost competitiveness.

At the same time, lithium phosphorus oxysulfide retains the unique advantages of sulfide solid electrolytes, combining extremely low density and good anode compatibility, which cannot be achieved simultaneously in oxide and halide solid electrolytes. In addition, lithium phosphorus oxysulfide is well compatible with both lithium metal and silicon; a symmetrical battery composed of it and lithium metal can stably cycle for more than 4,200 hours at room temperature, and an all-solid-state battery composed of it, a silicon anode, and a high-nickel ternary cathode The soft-pack battery still has a capacity retention rate of 89.29% after 200 cycles at 60 degrees.

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Editor in charge: Tan Chenxi