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July 23 news: The industry's exploration of all-solid-state batteries has never stopped, and today, good news came.

According to the official announcement of the Voice of the Chinese Academy of Sciences on Weibo, the University of Science and Technology of China has developed a new sulfide solid electrolyte for all-solid-state batteries.While this material has the inherent advantages of sulfide solid electrolytes, it is cheaper and more suitable for commercialization than other sulfide solid electrolytes.

Solid-state battery CATL

It is reported that Professor Ma Cheng of the University of Science and Technology of China has developed a method for all-solid-state batteries.New sulfide solid electrolyte Li7P3S7.5O3.5 (LPSO)The relevant research results have been published in Angewandte Chemie (DOI: 10.1002/anie.202407892).

"Well-known companies such as Toyota of Japan and Samsung of South Korea have invested heavily in the research and development of such materials in the past decade or so," said Professor Ma Cheng, but the cost of sulfide solid electrolytes generally exceeds US$195 per kilogram, far higher than the US$50 per kilogram required for commercialization.

The synthesis of this new material does not require expensive Li2S (no less than $650 per kg).The cost of raw materials per kilogram is only US$14.42 (currently about RMB 105), far below the commercialization threshold of $50/kg for most solid electrolytes.

In addition, the density of LPSO is 1.70 g/cm3, which is significantly lower than the density of oxide (usually above 5 g/cm3) and chloride (about 2.5 g/cm3) solid electrolytes, and it also exhibits excellent anode compatibility.

This material retains the unique advantages of sulfide solid electrolytes. The symmetrical battery composed of it and lithium metal can achieve a stable cycle at room temperature for more than 4200 hours, while the all-solid-state soft-pack battery composed of it, silicon negative electrode and high-nickel ternary positive electrode can achieve a stable cycle at room temperature for more than 4200 hours.After 200 cycles at 60°C, the capacity retention rate is still 89.29%.。

Ma Cheng explained: "Our work shows that the cost problem of sulfide solid electrolytes is not unsolvable. As a new material, lithium phosphorus oxysulfide is still expected to achieve further improvement in performance, and we are continuing to work hard on this."

The reviewers of the paper believe that the lithium phosphorus oxysulfide solid electrolyte "has low density, good negative electrode compatibility, and strong cost competitiveness" and the all-solid-state battery composed of lithium phosphorus oxysulfide has "excellent cycle performance". Its discovery has an important role in promoting the practical application of all-solid-state batteries.

The official announcement on the Voice of the Chinese Academy of Sciences Weibo and the information published on the USTC website