US 11,990,611 B2
Method for producing active material
Takayuki Uchiyama, Susono (JP); Shizuka Masuoka, Atsugi (JP); and Tetsuya Waseda, Susono (JP)
Assigned to TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP)
Filed by TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP)
Filed on Mar. 9, 2021, as Appl. No. 17/195,762.
Claims priority of application No. 2020-069136 (JP), filed on Apr. 7, 2020.
Prior Publication US 2021/0313566 A1, Oct. 7, 2021
Int. Cl. H01M 4/38 (2006.01); C01B 33/021 (2006.01); H01M 4/02 (2006.01)
CPC H01M 4/386 (2013.01) [C01B 33/021 (2013.01); C01P 2002/72 (2013.01); C01P 2002/74 (2013.01); C01P 2006/40 (2013.01); H01M 2004/021 (2013.01); H01M 2004/027 (2013.01); H01M 2220/20 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A method for producing an active material, the method comprising steps of:
a preparing step of preparing a LiSi precursor including a Si element and a Li element, and
a void forming step of forming a void by extracting the Li element from the LiSi precursor by using a Li extracting solvent, and
the LiSi precursor includes a crystal phase of Li22Si5,
wherein the LiSi precursor has peak “a” of the Li22Si5 at a position of 2θ=24.8°±0.5°, and has peak “b” of Li15Si4 at a position of 2θ=39.4°±0.5° in X-ray diffraction measurement using a CuKα ray, and
when an intensity of the peak “a” is regarded as Ia, and an intensity of the peak “b” is regarded as Ib, a peak intensity ratio (Ia/Ib) is 0.50 or more.