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Method of fabricating structured particles composed of silicon or silicon-based material and their use in lithium rechargeable batteries

  • US 8,772,174 B2
  • Filed: 04/08/2011
  • Issued: 07/08/2014
  • Est. Priority Date: 04/09/2010
  • Status: Active Grant
First Claim
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1. A method of treating silicon to form elongate structures on a treated surface, the method comprising a nucleation step in which metal is deposited on the silicon surface and an etching step in which silicon underlying the deposited metal is etched, whereina. the nucleation step comprises exposing a silicon containing material to a solution comprising HF at a concentration of less than 5M and0.002 to 0.2M of metal ions capable of nucleating on and forming a porous layer comprising regions of elemental metal on the silicon surface;

  • andb. the etching step comprisesi. exposing the silicon surface comprising regions of elemental metal to a solution comprising HF at a concentration of greater than 5M and 0.001 to 0.70M of an oxidant selected from the group comprising O2, O3, H2O2, the acid, ammonium or alkali metal salt of NO3

    , S2O82−

    , B4O72−

    and ClO4

    or a mixture thereof; and

    ii. adding oxidant to the solution during etching to maintain the concentration of oxidant within the above range.

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