The breakthrough was the result of a combined R&D effort between Nissan Arc Ltd., a Nissan subsidiary, Tohoku University, the National Institute for Materials Science (NIMS), the Japan Synchrotron Radiation Research Institute (JASRI), and Japan Science and Technology Agency (JST).
The analysis examines the structure of amorphous silicon monoxide (SiO), widely seen as key to boosting next-generation lithium-ion battery (Li-ion) capacity, allowing researchers to better understand electrode structure during charging cycles.
Silicon (Si) is capable of holding greater amounts of lithium, compared with common carbon-based materials, but in crystalline form possesses a structure that deteriorates during charging cycles, ultimately affecting performance. However, amorphous SiO is resistant to such deterioration.
Its base structure had been unknown, making it difficult for mass production. However, the new methodology provides an accurate understanding of the amorphous structure of SiO, based on a combination of structural analyses and computer simulations.
The atomic structure of SiO was thought to be non-homogeneous, making its precise atomic arrangements the subject of debate. The new findings show that its structure allows the storage of a larger number of Li-ions, in turn leading to better battery performance.
“The invention of this new analysis method is essential to further develop the next generation of high-capacity lithium-ion batteries. It will certainly become one of our core technologies. The utilization of this analysis method in our future R&D will surely contribute to extending the cruising range of future zero-emission vehicles,” said Nissan senior vice president Takao Asami. He is also Nissan Arc president.
“Nissan is exploring a wide range of energy sources for tomorrow’s vehicles, and we recognize our role in continuously investing in multiple technologies and intelligent mobility,” said Nissan executive vice president Daniele Schillaci.
The breakthrough has also been published online in the British multidisciplinary science journal Nature Communications.
