Negative-electrode active material for non-aqueous electrolyte secondary battery and non-aqueous electrolyte secondary battery
US10483528B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 18, 2016 |
| Grant date | Nov 19, 2019 |
| Priority date | — |
| Expiry date | Mar 11, 2036 |
Classification
- Technology area (CPC —)General
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 (10) according to an embodiment contains a base particle (13), which includes a lithium silicate phase (11) represented by Li2zSiO(2+z) {0<z<2} and silicon particles (12) dispersed in the lithium silicate phase (11). The symmetry determined by an image analysis of a backscattered electron image of a cross section of the base particle (13) 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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.