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Negative electrode active material and lithium secondary battery comprising same

  • US 10,586,976 B2
  • Filed: 04/22/2015
  • Issued: 03/10/2020
  • Est. Priority Date: 04/22/2014
  • Status: Active Grant
First Claim
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1. A negative active material for a secondary battery, the negative active material comprising silicon particles,wherein an average diameter of the silicon particles is in a range from 30 nm to 300 nm, andwherein circularities of the silicon particles are determined by Equation 1 below, and the circularities are 0.5 or greater and 0.9 or less,
Circularity=2(pi×

  • A)1/2/P



    [Equation 1]where A denotes a projected area of a silicon particle that is two-dimensionally projected, and P denotes a circumferential length of the silicon particle that is two-dimensionally projected.

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