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
1 Assignment
0 Petitions
Accused Products
Abstract
A negative electrode active material contains 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. According to this constitution, when it is used as the negative electrode active material of a secondary battery, a negative electrode active material is capable of increasing battery capacity and improving cycle characteristics.
1 Citation
32 Claims
-
1-16. -16. (canceled)
-
17. 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.- View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
-
30. A method for producing a negative electrode material for a non-aqueous electrolyte secondary battery containing particles of negative electrode active material, which comprises:
-
preparing particles of negative electrode active material containing a silicon compound represented by the general formula;
SiOx (0.5≤
x≤
1.6),measuring the particles of negative electrode active material by an atom probe method, when an Si 75% equivalent concentration surface obtained by the atom probe method is defined to be a boundary surface of a silicon grain, selecting particles of negative electrode active material having an average diameter of the silicon grains at a center portion of the particle in the particles of negative electrode active material of in the range of 0.25 nm to 5 nm, and producing a negative electrode material for a non-aqueous electrolyte secondary battery using the selected particles of negative electrode active material. - View Dependent Claims (31, 32)
-
Specification