The element with the second highest impurity concentration was Fe
(less than 0.07%). Na, Ca, K, and Al were all under 0.01%. Although
the nano-Si is directly recovered from a natural substance, its purity
is more than enough for application in Li-ion battery anodes. The
impurities may even improve the electrical conductivity of the Si
anode through doping. For other applications, such as solar cells,
the impurity level must be much lower, which could possibly be
realized with a purer Mg reagent and additional acid leaching of
the RH and the mixture after the magnesiothermic reduction6. It
should be noted that previous attempts to recover silicon from
RHs focused on the purity, because the purpose was to use them in
solar cells35. Here, we focus primarily on preserving the nanostructure
of the recovered silicon, targeting application in Li-ion batteries
The element with the second highest impurity concentration was Fe
(less than 0.07%). Na, Ca, K, and Al were all under 0.01%. Although
the nano-Si is directly recovered from a natural substance, its purity
is more than enough for application in Li-ion battery anodes. The
impurities may even improve the electrical conductivity of the Si
anode through doping. For other applications, such as solar cells,
the impurity level must be much lower, which could possibly be
realized with a purer Mg reagent and additional acid leaching of
the RH and the mixture after the magnesiothermic reduction6. It
should be noted that previous attempts to recover silicon from
RHs focused on the purity, because the purpose was to use them in
solar cells35. Here, we focus primarily on preserving the nanostructure
of the recovered silicon, targeting application in Li-ion batteries
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