	US 12,255,313 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); Takakazu Hirose, Annaka (JP); and Takumi Matsuno, Annaka (JP)
Assigned to SHIN-ETSU CHEMICAL CO., LTD., Tokyo (JP)
Appl. No. 16/500,193
Filed by SHIN-ETSU CHEMICAL CO., LTD., Tokyo (JP)
PCT Filed May 18, 2018, PCT No. PCT/JP2018/019212 § 371(c)(1), (2) Date Oct. 2, 2019, PCT Pub. No. WO2018/221258, PCT Pub. Date Dec. 6, 2018.
Claims priority of application No. 2017-109785 (JP), filed on Jun. 2, 2017.
Prior Publication US 2020/0112021 A1, Apr. 9, 2020
Int. Cl. H01M 4/36 (2006.01); H01M 4/02 (2006.01); H01M 4/485 (2010.01); H01M 4/587 (2010.01)

CPC H01M 4/366 (2013.01) [H01M 4/485 (2013.01); H01M 4/587 (2013.01); H01M 2004/027 (2013.01)]

8 Claims

1. A negative electrode active material for a non-aqueous electrolyte secondary battery, the negative electrode active material containing

a negative electrode active material particle comprising a silicon compound particle containing a silicon compound (SiO_x: 0.5 ≤x≤1.6),

wherein

the silicon compound particle contains a Li compound,

at least a part of the silicon compound particle is coated with a carbon material,

the silicon compound particle at least partially contains at least one or more selected from Li₄SiO₄, Li₂SiO₃, and Li₂Si₂O₅,

a compound having a trialkylsilyl group is present on an outermost surface of the negative electrode active material particle such that at least a part of a surface of the silicon compound particle, a surface of the carbon material, or both of them are coated with a layer containing the compound having the trialkylsilyl group,

the trialkylsilyl group has alkyl groups with 1 to 5 carbon atoms, and

a coating amount of the carbon material is 0.5 mass % or more and 15 mass % or less relative to a total of the silicon compound particle and the carbon material.