US 12,255,322 B2
Negative electrode material for secondary battery
Jae Woo Lee, Sejong-si (KR); Jin Gee Park, Daegu (KR); Sun Ho Choi, Sejong-si (KR); Jung Hoon Cheon, Sejong-si (KR); Sung Soo Kim, Daejeon (KR); and Sichen Du, Täby (SE)
Assigned to Tera Technos Co., Ltd., Daejeon (KR)
Filed by Tera Technos Co, Ltd., Daejeon (KR)
Filed on Nov. 23, 2021, as Appl. No. 17/456,265.
Claims priority of application No. 10-2021-0095725 (KR), filed on Jul. 21, 2021.
Prior Publication US 2023/0033377 A1, Feb. 2, 2023
Int. Cl. H01M 4/36 (2006.01); H01M 4/02 (2006.01); H01M 4/38 (2006.01); H01M 4/48 (2010.01); H01M 4/485 (2010.01); H01M 4/62 (2006.01); H01M 10/0525 (2010.01); H01M 10/054 (2010.01)
CPC H01M 4/48 (2013.01) [H01M 4/366 (2013.01); H01M 4/625 (2013.01); H01M 2004/021 (2013.01); H01M 2004/027 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A negative electrode material for a secondary battery, comprising:
a matrix containing silicon oxide, and a composite oxide of a doping element; wherein the doping element is magnesium (Mg), and
silicon nanoparticles dispersed and embedded in the matrix;
wherein a hardness and a Young's modulus measured by a nanoindentation test are 4.0 GPa or more and 40 GPa or more, respectively, and in an X-ray diffraction pattern using a CuKα ray, a ratio (A1/A2) is 0.8 to 6, wherein A1 is an area of a first peak present in a region where a diffraction angle 2θ is 10° to 27.4°, and A2 is an area of a second peak present in a region where the diffraction angle 2θ is 28±0.5°, and
wherein the negative electrode material satisfies the following Expression 3:
B/A≤0.65  (Expression 3)
wherein A is an average value (A) obtained by averaging contents (wt %) of the doping element measured at 100 random points based on a cross section crossing the center of the negative electrode material, and B is a standard deviation (B) of the contents of the doping element.