The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 29, 2018
Filed:
Oct. 28, 2013
Nec Corporation, Tokyo, JP;
Jiro Iriyama, Tokyo, JP;
Daisuke Kawasaki, Tokyo, JP;
Emiko Fujii, Tokyo, JP;
Shin Serizawa, Tokyo, JP;
Hiroo Takahashi, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
A negative electrode active material comprising silicon oxide satisfying the following Equation 1 and Equation 2 when solid state NMR (Si-DDMAS) of silicon is measured for the silicon oxide after performing charging at least once is excellent in the performance as a negative electrode active material for a lithium secondary battery;0.42≤1/(1+2+3)≤0.55  (Equation 1)0.21≤3/(1+2+3)≤0.26,  (Equation 2)in which S1 is a sum of peak areas of a group of signals assigned to Si having a Si—Si bond and having peaks at 0 to −15 ppm, −55 ppm, −84 ppm and −88 ppm, S2 is a sum of peak areas of a group of signals assigned to Si having a Si(OH)(OSi)(n=3, 4) structure and having peaks at −100 ppm and −120 ppm, and S3 is a sum of peak areas of a group of signals assigned to Si having a Si(OLi)(OSi)(n=0, 1, 2, 3) structure and having peaks at −66 ppm, −74 ppm, −85 ppm and −96 ppm.