US 11,936,034 B2
Negative electrode active substance for secondary battery, and secondary battery
Yohei Uchiyama, Hyogo (JP); Norihisa Yamamoto, Osaka (JP); and Tatsuya Akira, Osaka (JP)
Assigned to PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD., Osaka (JP)
Appl. No. 16/957,182
Filed by Panasonic Intellectual Property Management Co., Ltd., Osaka (JP)
PCT Filed Dec. 26, 2018, PCT No. PCT/JP2018/047755
§ 371(c)(1), (2) Date Jun. 23, 2020,
PCT Pub. No. WO2019/131724, PCT Pub. Date Apr. 7, 2019.
Claims priority of application No. 2017-252456 (JP), filed on Dec. 27, 2017.
Prior Publication US 2020/0321611 A1, Oct. 8, 2020
Int. Cl. H01M 4/36 (2006.01); H01M 4/485 (2010.01); H01M 10/0525 (2010.01)
CPC H01M 4/364 (2013.01) [H01M 4/485 (2013.01); H01M 10/0525 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A negative electrode active material for a secondary battery comprising:
a silicate phase including elements Na, Si, and Mx, wherein Mx represents one or more elements other than an alkali metal or Si; and
silicon particles dispersed in the silicate phase, wherein,
the Mx includes at least one of elements Y, Nb, V, La, and T
in the silicate phase, the element Na content is 9 mol % to 52 mol %, and the element Mx content is 3 mol % to 50 mol %, and a Si content is 25 mol % or more, each based on the total amount other than oxygen, and
the silicon particles have an average particle size of less than 100 nm.