US 12,347,860 B2
Negative electrode active material for aqueous secondary battery, negative electrode for aqueous secondary battery, and aqueous secondary battery
Kenji Matsubara, Osaka (JP); and Masanobu Takeuchi, Osaka (JP)
Assigned to PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD., Osaka (JP)
Appl. No. 17/795,680
Filed by Panasonic Intellectual Property Management Co., Ltd., Osaka (JP)
PCT Filed Dec. 1, 2020, PCT No. PCT/JP2020/044693
§ 371(c)(1), (2) Date Jul. 27, 2022,
PCT Pub. No. WO2021/152998, PCT Pub. Date Aug. 5, 2021.
Claims priority of application No. 2020-015216 (JP), filed on Jan. 31, 2020.
Prior Publication US 2023/0058362 A1, Feb. 23, 2023
Int. Cl. H01M 4/583 (2010.01); H01M 4/02 (2006.01); H01M 10/0568 (2010.01); H01M 10/0569 (2010.01)
CPC H01M 4/583 (2013.01) [H01M 10/0568 (2013.01); H01M 10/0569 (2013.01); H01M 2004/021 (2013.01); H01M 2300/0028 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A negative electrode active material for an aqueous secondary battery, the negative electrode active material to be applied to an aqueous secondary battery in which an aqueous electrolyte liquid is used, the aqueous electrolyte liquid containing water and a lithium salt,
the negative electrode active material comprising non-graphitizable carbon,
the non-graphitizable carbon having a surface having a C—F bond group,
the non-graphitizable carbon having a ratio of a peak intensity I688eV to a peak intensity I284eV as an I688eV/I284eV value represented by X in an X-ray photoelectron spectroscopy (XPS) spectrum obtained by XPS measurement wherein the peak intensity I688eV represents a peak intensity in a vicinity of 688 eV derived from a C—F bond, and the peak intensity I284eV represents a peak intensity in a vicinity of 284 eV derived from a C—C bond, the non-graphitizable carbon having a BET specific surface area (m2/g) represented by Y, X and Y satisfying Y<−0.3X+3.75, 0.1≤X≤5, and Y≥2.