	US 12,074,319 B2
	Negative electrode active material for non-aqueous electrolyte secondary battery, non-aqueous electrolyte secondary battery, and method for producing negative electrode material for non-aqueous electrolyte secondary battery
Kohta Takahashi, Takasaki (JP); Yusuke Osawa, Annaka (JP); Takakazu Hirose, Annaka (JP); Yoshiyasu Yamada, Tomioka (JP); and Takumi Matsuno, Annaka (JP)
Assigned to SHIN-ETSU CHEMICAL CO., LTD., Tokyo (JP)
Appl. No. 17/421,522
Filed by SHIN-ETSU CHEMICAL CO., LTD., Tokyo (JP)
PCT Filed Dec. 26, 2019, PCT No. PCT/JP2019/051049 § 371(c)(1), (2) Date Jul. 8, 2021, PCT Pub. No. WO2020/149133, PCT Pub. Date Jul. 23, 2020.
Claims priority of application No. 2019-005012 (JP), filed on Jan. 16, 2019.
Prior Publication US 2022/0069297 A1, Mar. 3, 2022
Int. Cl. H01M 4/133 (2010.01); C01B 33/113 (2006.01); H01M 4/131 (2010.01); H01M 4/1391 (2010.01); H01M 4/1393 (2010.01); H01M 4/38 (2006.01); H01M 10/0525 (2010.01); H01M 4/02 (2006.01)

CPC H01M 4/386 (2013.01) [C01B 33/113 (2013.01); H01M 4/131 (2013.01); H01M 4/133 (2013.01); H01M 4/1391 (2013.01); H01M 4/1393 (2013.01); H01M 10/0525 (2013.01); C01P 2002/74 (2013.01); H01M 2004/027 (2013.01)]

16 Claims

1. A negative electrode active material for a non-aqueous electrolyte secondary battery, containing negative electrode active material particles which comprise particles of a silicon compound (SiO_x: 0.5≤x≤1.6), wherein

the negative electrode active material particles are at least partially coated with a carbon material, and comprise Li₂SiO_3Zand when Ic/Ia is >0, Li₂Si₂O₅, and

the negative electrode active material particles satisfy 1.5≤Ib/Ia≤4.8 and Ic/Ia≤2.0 in an X-ray diffraction measurement using a Cu-Kα line, where

Ia represents an intensity of a peak around 2θ=28.4° attributable to Si obtained by the X-ray diffraction,

Ib represents a peak intensity of a peak attributable to Li₂SiO₃obtained by the X-ray diffraction, and

Ic represents a peak intensity of a peak attributable to Li₂Si₂O₅obtained by the X-ray diffraction.