US 12,113,216 B2
Negative electrode active material for secondary batteries, and secondary battery
Yohei Uchiyama, Hyogo (JP); Taisuke Asano, Hyogo (JP); and Yosuke Sato, Osaka (JP)
Assigned to PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD., Osaka (JP)
Appl. No. 17/270,519
Filed by Panasonic Intellectual Property Management Co., Ltd., Osaka (JP)
PCT Filed Aug. 23, 2019, PCT No. PCT/JP2019/032939
§ 371(c)(1), (2) Date Feb. 23, 2021,
PCT Pub. No. WO2020/045257, PCT Pub. Date Mar. 5, 2020.
Claims priority of application No. 2018-161780 (JP), filed on Aug. 30, 2018.
Prior Publication US 2021/0320299 A1, Oct. 14, 2021
Int. Cl. H01M 4/58 (2010.01); H01M 4/38 (2006.01); H01M 4/02 (2006.01)
CPC H01M 4/5825 (2013.01) [H01M 4/382 (2013.01); H01M 4/386 (2013.01); H01M 2004/027 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A negative electrode active material for a secondary battery, comprising: silicate composite particles each of which contain a silicate phase and silicon particles dispersed in the silicate phase,
wherein the silicate phase is an oxide phase which contains Si, O, and alkali metals, and
the alkali metals include at least Na and K, and
wherein, with respect to a total amount of elements other than O contained in the silicate phase,
a content of Na is 7 percent by mole or more,
a content of K is 7 percent by mole or more, and
a total content of Na and K is 70 percent by mole to 40 percent by mole.