US 12,456,760 B2
Non-aqueous electrolyte solution for sodium ion secondary battery, and sodium ion secondary battery
Jungmin Kim, Tokyo (JP)
Assigned to Mitsubishi Chemical Corporation, Tokyo (JP)
Filed by Mitsubishi Chemical Corporation, Tokyo (JP)
Filed on Aug. 26, 2021, as Appl. No. 17/445,966.
Application 17/445,966 is a continuation of application No. PCT/JP2020/008120, filed on Feb. 27, 2020.
Claims priority of application No. 2019-035883 (JP), filed on Feb. 28, 2019.
Prior Publication US 2021/0391600 A1, Dec. 16, 2021
Int. Cl. H01M 10/36 (2010.01); C07D 327/10 (2006.01); H01M 4/583 (2010.01); H01M 4/02 (2006.01)
CPC H01M 10/36 (2013.01) [C07D 327/10 (2013.01); H01M 4/583 (2013.01); H01M 2004/021 (2013.01); H01M 2300/0037 (2013.01)] 23 Claims
 
1. A sodium ion secondary battery, comprising:
a positive electrode;
a negative electrode comprising a negative electrode active material layer on a current collector; and
an electrolyte solution comprising (i) a non-aqueous solvent, (ii) NaPF6, and (iii) a compound of formula (1):

OG Complex Work Unit Chemistry
R1 and R2 each being H, and n being 0 or 1,
wherein a (iii)/(ii) molar ratio of a content of (iii) the compound of formula (1) with respect to a content of (ii) the NaPF6 is in a range of from 0.001 to 1.5,
wherein the negative electrode active material layer comprises a negative electrode active material,
wherein the negative electrode active material comprises a porous carbon material,
wherein the porous carbon material has (a) plural closed pores that are not in communication with a surface of the negative electrode active material and (b) a solid portion made of a carbon material, and
wherein the sodium ion secondary battery comprises no added dinitrile.