Si/C COMPOSITE MATERIAL, METHOD FOR MANUFACTURING THE SAME, AND ELECTRODE
AssigneeTohoku University
InventorsTakashi Kyotani, Hirotomo Nishihara, Shinichiroh Iwamura
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Abstract
The present invention provides composite material in which Si and carbon are combined so as to form an unprecedented structure; method for fabricating the same; and negative electrode material for lithium-ion batteries ensuring high charge-discharge capacity and high cycle performance. By heating an aggregate of Si nanoparticles and using a source gas containing carbon, a carbon layer is formed on each of the Si particles. Walls 12 forming a space 13a containing Si particles 11 and a space 13b not containing Si particles 11 are constructed by this carbon layer.
Claims18
-17. (canceled)
A composite material, comprising:
- agglomerated bodies of agglomerated Si nanoparticles;
- and
- extendable-contractible accordion-shaped walls of carbon-layer, the walls being uniformly formed on the agglomerated bodies.
A method for fabricating a composite material, comprising:
- heating an aggregate of Si nanoparticles;
- forming a carbon layer on each of the Si nanoparticles using a source gas containing carbon, thereby making walls of carbon-layer, the walls dividing a space into sections including containing each of the Si nanoparticles and not containing each of the Si nanoparticles;
- and
- performing heat treatment at a temperature higher than a level at which the carbon layer is formed.
A method for fabricating a composite material, comprising:
- heating an aggregate of Si nanoparticles;
- and
- forming a carbon layer using a pulsed CVD method on each of Si nanoparticles using a source gas containing carbon, thereby making walls of carbon-layer, the walls dividing a space into sections including containing each of the Si nanoparticles and not containing each of the Si nanoparticles;
- and
- performing heat treatment at a temperature higher than a level at which the carbon layer is formed.
Dependencies are inferred from the claim text.