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:
Dec. 24, 2019
Filed:
Jan. 18, 2016
Sanyo Electric Co., Ltd., Daito-shi, Osaka, JP;
Norihisa Yamamoto, Osaka, JP;
Taizou Sunano, Tokushima, JP;
Hiroshi Minami, Hyogo, JP;
Yoshio Kato, Osaka, JP;
Yohei Uchiyama, Hyogo, JP;
SANYO Electric Co., Ltd., Daito-shi, JP;
Abstract
The initial charge/discharge efficiency and cycle characteristics of a non-aqueous electrolyte secondary battery that contains a silicon material as a negative-electrode active material are improved. A negative-electrode active material particle () according to an embodiment contains a base particle (), which includes a lithium silicate phase () represented by LiSiO{0<z<2} and silicon particles () dispersed in the lithium silicate phase (). The symmetry determined by an image analysis of a backscattered electron image of a cross section of the base particle () is 1.5 or less. The symmetry refers to the ratio (b/a) of the half width at half maximum b of a peak on the high-gray-scale side to the half width at half maximum a of the peak on the low-gray-scale side in a histogram of color distinction based on 256 gray levels for each pixel of the backscattered electron image.