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US 12,759,886 B2Granted
Method for producing nano-silicon, negative electrode active material for lithium-ion batteries, negative electrode for lithium-ion batteries, and lithium-ion battery
AssigneeFimatec Ltd.
InventorsMasato Katayama, Tomonao Umehara, Kohei Yoshida
Life of this patent
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Abstract
A method for producing nano-silicon, involves (a) conducting a reduction treatment on an aluminosilicate, in which a content of Al2O3 is 3 to 40% by mass. A ratio between the number of atoms of aluminum contained in the aluminosilicate and the number of atoms of magnesium used as a reducing agent in the reduction treatment is within a range of 1:3.5 to 1:65. The method then involves (b) conducting acid treatment on a reduced aluminosilicate obtained from (a).
Claims13
A method for producing nano-silicon, comprising:
- providing an aluminosilicate having an Al2O3 content of 3-20 wt. %;
- (a) conducting a reduction treatment on said aluminosilicate in which a ratio between the number of atoms of aluminum contained in the aluminosilicate and the number of atoms of magnesium used as a reducing agent in the reduction treatment is within a range of 1:3.5 to 1:65;
- and
- (b) conducting an acid treatment on a reduced aluminosilicate obtained in (a). wherein aluminum reduced from said Al2O3 participates in reduction of SiO2.
1 more element
A method for producing nano-silicon, comprising:
- obtaining an aluminosilicate in which a content of Al2O3 is 3 to 20% by mass by conducting a hot sulfuric acid treatment on an aluminosilicate, and conducting a reduction treatment on the aluminosilicate thus obtained;
- and
- conducting an acid treatment on a reduced aluminosilicate obtained in the reduction treatment,
- wherein said hot sulfuric acid treatment is performed at a temperature of at least 90° C.
1 more element
Dependencies are inferred from the claim text.