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Carbon material for lithium ion secondary battery

  • US 8,647,776 B2
  • Filed: 08/22/2011
  • Issued: 02/11/2014
  • Est. Priority Date: 02/20/2009
  • Status: Active Grant
First Claim
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1. A carbon material for lithium ion secondary battery having a surface functional group amount O/C, a surface functional group amount Cl/C, and a surface functional group amount S165/C, wherein the surface functional group amount O/C value represented by the following formula 1 is from 1 to 4% and a sum (Cl/C+S165/C) of the surface functional group amount Cl/C value represented by the following formula 2 and the surface functional group amount S165/C value represented by the following formula 3 is from 0.05 to 0.5%:


  • O/C value (%)=O atom concentration determined based on the peak area of the spectrum of O1s in X-ray photoelectron spectroscopy (XPS) analysis/C atom concentration determined based on the peak area of the spectrum of C1s in XPS analysis×

    100 



    Formula 1;


    Cl/C value (%)=Cl atom concentration determined based on the peak area of the spectrum of Cl2p in XPS analysis/C atom concentration determined based on the peak area of the spectrum of C1s in XPS analysis×

    100 



    Formula 2;


    S165/C value (%)=S165 atom concentration based on the peak area of the peak near 165 eV in the spectrum corresponding to S2p in XPS analysis/C atom concentration determined based on the peak area of the spectrum of C1s in XPS analysis×

    100 



    Formula 3.

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