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Negative electrode active material, negative electrode, lithium ion secondary battery, method for producing negative electrode material for non-aqueous electrolyte secondary battery and method for producing lithium ion secondary battery

  • US 10,811,681 B2
  • Filed: 10/27/2016
  • Issued: 10/20/2020
  • Est. Priority Date: 11/20/2015
  • Status: Active Grant
First Claim
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1. A negative electrode active material which comprises:

  • a negative electrode active material containing particles of negative electrode active material, wherein the particles of negative electrode active material contain a silicon compound represented by SiOx (0.5≤

    x≤

    1.6), and when the particles of negative electrode active material are measured by an atom probe method and an Si 75% equivalent concentration surface obtained by the atom probe method is defined to be a boundary surface of a silicon grain, an average diameter of the silicon grains at a center portion of the particle in the particles of negative electrode active material is in the range of 0.25 nm to 5 nm, anda ratio A/B of a maximum length A and a minimum length B of the silicon grain is calculated, an average value of the ratio A/B of the silicon grains contained at a surface layer portion of the particle in the particles of negative electrode active material is larger than an average value of the ratio A/B of the silicon grains contained at a center portion of the particle in the particles of negative electrode active material.

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