According to foreign media reports, researchers at the National Institute for Materials Science (NIMS) claim that nanoporous amorphous silicon films exhibit excellent cycle stability and lithium ions. Extremely high storage capacity: 2962 mAh/g (2.19 mAh/cm2) after 100 charge and discharge cycles.
The NIMS team combined nanoporous amorphous silicon films with inorganic solid electrolytes to address capacity fading. The nanoporous structure can accommodate the volume change of silicon, thereby limiting the mechanical fracture and pulverization of the anode.
Unlike liquid electrolytes, solid electrolytes do not decompose because of their wide range of electrochemical stability windows. It has been proved by experiments that the capacity of silicon material is relatively high, and even if it is charged and discharged 100 times, the attenuation of capacity is small.
The research was funded by the New Energy and Industrial Technology Development Organization (NEDO) and Toyota Motor Corporation.
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