Fast Technology reported on July 23 that the industry’s exploration of all-solid-state batteries has never stopped.
Today, there is good news.
The Voice of the Chinese Academy of Sciences official announced that 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 more costly than other sulfide solid electrolytes.
Cheap and more suitable for commercialization.
, it is reported that Professor Ma Cheng of the University of Science and Technology of China has developed a new sulfide solid electrolyte Li7P3S7.5O3.5 (LPSO) for all-solid-state batteries.
Relevant research results have been published in German Applied Chemistry (DOI:10.
1002/anie.
202407892).
“Well-known companies such as Toyota of Japan and Samsung of South Korea have invested heavily in research and development of such materials in the past decade or so.
” Professor Ma Cheng said, but the cost of sulfide solid electrolytes generally exceeds US$195 per kilogram, which is much higher than the US$50 per kilogram required for commercialization.
The synthesis of this new material does not require expensive Li2S (no less than US$650 per kilogram), and the cost per kilogram of raw material is only US$14.
42 (currently about RMB 105), which is far below the commercialization threshold of US$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 also exhibits excellent anode compatibility.
This material retains the unique advantages of sulfide solid-state electrolytes.
A symmetrical battery composed of it and lithium metal can achieve stable cycling at room temperature for more than 4200 hours, while an all-solid soft-pack battery composed of silicon negative electrodes and high-nickel ternary positive electrodes, After cycling at 60 ° C for 200 times, it still has a capacity retention rate of 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.
We are also continuing to work hard to this end.
“, 
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