US 11,961,997 B2
Negative electrode active material, mixed negative electrode active material, aqueous negative electrode slurry composition, and method for producing negative electrode active material
Takumi Matsuno, Annaka (JP); Hidekazu Awano, Takasaki (JP); Takakazu Hirose, Annaka (JP); Kohta Takahashi, Takasaki (JP); and Yusuke Osawa, Annaka (JP)
Assigned to SHIN-ETSU CHEMICAL CO., LTD., Tokyo (JP)
Appl. No. 17/290,935
Filed by SHIN-ETSU CHEMICAL CO., LTD., Tokyo (JP)
PCT Filed Sep. 25, 2019, PCT No. PCT/JP2019/037442
§ 371(c)(1), (2) Date May 3, 2021,
PCT Pub. No. WO2020/095558, PCT Pub. Date May 14, 2020.
Claims priority of application No. 2018-209505 (JP), filed on Nov. 7, 2018.
Prior Publication US 2021/0376311 A1, Dec. 2, 2021
Int. Cl. H01M 4/131 (2010.01); H01M 4/02 (2006.01); H01M 4/133 (2010.01); H01M 4/139 (2010.01); H01M 4/36 (2006.01); H01M 4/485 (2010.01); H01M 4/58 (2010.01); H01M 4/587 (2010.01)
CPC H01M 4/364 (2013.01) [H01M 4/131 (2013.01); H01M 4/133 (2013.01); H01M 4/139 (2013.01); H01M 4/366 (2013.01); H01M 4/485 (2013.01); H01M 4/5825 (2013.01); H01M 4/587 (2013.01); H01M 2004/021 (2013.01); H01M 2004/027 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A negative electrode active material for a non-aqueous electrolyte secondary battery, containing negative electrode active material particles, wherein
the negative electrode active material particles comprise silicon compound particles each containing a silicon compound represented by SiOx where 0.5≤x≤1.6,
the silicon compound particle also contains at least one or more of Li2SiO3 and Li2Si2O5,
the negative electrode active material comprises a phosphate,
the negative electrode active material particles each have a surface containing lithium element,
a ratio mp/ml satisfies 0.07≤mp/ml≤0.8, where ml represents a molar quantity of the lithium element present on the surfaces of the negative electrode active material particles per unit mass of the negative electrode active material particles, and mp represents a molar quantity of phosphorus element contained per unit mass of the negative electrode active material particles, and
the negative electrode active material particles cause a dispersion containing 10 mass % of the negative electrode active material particles dispersed in pure water to have a pH value of 10 or more and 12.5 or less.