A research team led by Prof. Ma Cheng from the University of Science and Technology of China (USTC) of the Chinese Academy of Sciences (CAS) has developed a new type of solid-state electrolyte. The study was published in Communication in Nature.
All-solid-state lithium batteries (ASSLBs) are a game changer for electric vehicles because they not only overcome the serious safety issues of current commercial lithium-ion batteries but also have greater room for improving energy-density. Identification of a suitable solid-state electrolyte is essential for the construction of ASSLBs. However, high-performance solid-state electrolytes are currently generally too expensive for commercialization.
In this study, the researchers developed a new solid-state electrolyte named lithium zirconium oxychloride (LZCO). LZCO can be synthesized from common inexpensive compounds such as lithium hydroxide monohydrate, lithium chloride, and zirconium chloride. Because of this, its cost is as low as $11.60 per kilogram. This is less than the $50 per kilogram threshold for commercialization, and also less than high-performance sulfide and chloride solid-state electrolytes (typically more than $190 per kilogram).
With such a cost-competitiveness, LZCO delivers state-of-the-art performance. It has a room temperature ionic conductivity of up to 2.42 mS cm-1, which is one of the highest among all types of solid-state electrolytes reported so far. Besides, this material excels in compression. It can achieve 94.2% density under 300 MPa, which is superior to easily compressible sulfide and chloride solid-state electrolytes (less than 90% at the same pressure).
The comprehensive performance of LZCO has been experimentally proven to be comparable to the most advanced sulfide and chloride solid-state electrolytes available. The ASSLB formed by LZCO and the nickel-rich layered cathode showed remarkable performance: the battery cycled stably at room temperature for more than 2,000 cycles under 12-minute fast charging conditions. charge.
This new material marks a significant breakthrough in the performance and cost-effectiveness of solid-state electrolytes, opening new possibilities for the commercialization of ASSLBs.
Lv Hu et al, A cost-effective, ionically conductive and compressible oxychloride solid-state electrolyte for stable all-solid-state lithium-based batteries, Communication in Nature (2023). DOI: 10.1038/s41467-023-39522-1
Awarded by the Chinese Academy of Sciences
Citation: New oxychloride solid-state electrolyte for lithium batteries shows good performance, low cost (2023, July 13) retrieved 13 July 2023 from https://techxplore.com/news/2023-07-oxychloride- solid-state-electrolyte-lithium-battery.html
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