US 12,334,505 B2
Secondary battery
Satoshi Umezu, Kyoto (JP); Yusuke Morino, Kyoto (JP); Takumi Hiasa, Kyoto (JP); and Kazunari Motohashi, Kyoto (JP)
Assigned to Murata Manufacturing Co., Ltd., Kyoto (JP)
Filed by MURATA MANUFACTURING CO., LTD., Kyoto (JP)
Filed on Apr. 25, 2022, as Appl. No. 17/728,482.
Application 17/728,482 is a continuation of application No. PCT/JP2020/039227, filed on Oct. 19, 2020.
Claims priority of application No. 2019-194119 (JP), filed on Oct. 25, 2019.
Prior Publication US 2022/0255135 A1, Aug. 11, 2022
Int. Cl. H01M 10/0569 (2010.01); H01M 10/0525 (2010.01)
CPC H01M 10/0569 (2013.01) [H01M 10/0525 (2013.01); H01M 2300/0028 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A secondary battery comprising:
a positive electrode having a potential, versus a lithium reference electrode, at a time of charging higher than or equal to 4.50 volts;
a negative electrode; and
an electrolytic solution including a branched carboxylic acid ester compound represented by Formula (1),

OG Complex Work Unit Chemistry
where
R1 is a first alkyl group,
R2 is a second alkyl group,
R3 is a hydrogen group,
R4 is one of a third alkyl group or a halogenated alkyl group, and
a total of a carbon number of R1, a carbon number of R2, and a carbon number of R3 is 2 or 3.