US 12,148,883 B2
Lithium secondary battery
Masahisa Fujimoto, Osaka (JP); and Shuji Ito, Nara (JP)
Assigned to PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD., Osaka (JP)
Filed by Panasonic Intellectual Property Management Co., Ltd., Osaka (JP)
Filed on Jul. 22, 2020, as Appl. No. 16/935,205.
Application 16/935,205 is a continuation of application No. PCT/JP2019/017412, filed on Apr. 24, 2019.
Claims priority of application No. 2018-103971 (JP), filed on May 30, 2018.
Prior Publication US 2020/0350629 A1, Nov. 5, 2020
Int. Cl. H01M 10/05 (2010.01); H01M 4/40 (2006.01); H01M 10/0525 (2010.01); H01M 10/0567 (2010.01); H01M 4/02 (2006.01)
CPC H01M 10/0567 (2013.01) [H01M 4/405 (2013.01); H01M 10/0525 (2013.01); H01M 2004/027 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A lithium secondary battery, comprising:
a cathode;
an anode including an anode current collector and an anode active material;
a separator disposed between the cathode and the anode; and
an electrolyte liquid in contact with the cathode and the anode,
wherein:
the cathode includes a cathode current collector and a cathode active material layer disposed on the cathode current collector,
the anode includes a material capable of forming an alloy with lithium during charge,
the electrolyte liquid includes lithium ions and counter anions of the lithium ions,
the electrolyte liquid contains at least one selected from the group consisting of phenanthrene, biphenyl, triphenylene, acenaphthene, acenaphthylene, fluoranthene, and benzyl,
the electrolyte includes at least one selected from the group consisting of a cyclic ether, a glyme, and a sulfolane as the solvent thereof,
the anode active material is disposed away from the anode current collector,
the anode active material as a whole is separated from the anode current collector by the electrolyte liquid,
in a charge state, a potential of the electrolyte liquid is lower than an equilibrium potential of the anode active material, and
in a discharge state, the potential of the electrolyte liquid is higher than the equilibrium potential of the alloy of the anode active material with lithium.