Secondary battery, battery pack, electric vehicle, electric power storage system, electric power tool, and electronic apparatus
A secondary battery is provided. The secondary battery includes a cathode; an anode; and a gel electrolyte, wherein the gel electrolyte includes an electrolytic solution and a polymer, and the electrolytic solution includes an unsaturated cyclic ester carbonate represented by Formula (2): where R5 and R6 are one of a hydrogen group, a halogen group, a monovalent hydrocarbon group, a monovalent halogenated hydrocarbon group, a monovalent oxygen-containing hydrocarbon group, and a monovalent halogenated oxygen-containing hydrocarbon group; and where R5 and R6 may be bonded to each other.
1. A secondary battery comprising:
a cathode;
an anode; and
a gel electrolyte, wherein
the gel electrolyte includes an electrolytic solution and a polymer, and
the electrolytic solution includes 0.1 to 5 wt % of an unsaturated cyclic ester carbonate represented by Formula (2):
wherein R5 and R6 are one of a halogen group, a monovalent halogenated hydrocarbon group, a monovalent oxygen-containing hydrocarbon group, and a monovalent halogenated oxygen-containing hydrocarbon group; and where R5 and R6 may be bonded to each other.
2. The secondary battery according to claim 1 , wherein the electrolytic solution comprises an electrolyte salt comprising LiPF 6 dissolved in a solvent comprising ethylene carbonate (EC) and ethyl methyl carbonate (EMC).
3. The secondary battery according to claim 2 , wherein a weight ratio of the solvent is EC:EMC=50:50.
4. The secondary battery according to claim 2 , wherein a content of the electrolyte salt with respect to the solvent is 1 mol/kg.
5. The secondary battery according to claim 1 , wherein the polymer is selected from the group consisting of polyvinylidene fluoride and a copolymer of vinylidene fluoride and hexafluoro propylene.
6. The secondary battery according to claim 5 , wherein the polymer is polyvinylidene fluoride.
7. The secondary battery according to claim 1 , wherein the electrolytic solution consists of the unsaturated cyclic ester carbonate and one or more of ethylene carbonate, propylene carbonate, dimethyl carbonate, diethyl carbonate, and ethyl methyl carbonate.
8. A battery pack comprising:
the secondary battery according to claim 1 ; and
a control section controlling a used state of the secondary battery.
9. An electric vehicle comprising:
the secondary battery according to claim 1 ;
a conversion section converting electric power supplied from the secondary battery into drive power;
a drive section operating according to the drive power; and
a control section controlling a used state of the secondary battery.
10. An electric power storage system comprising:
the secondary battery according to claim 1 ;
one or more electric devices supplied with electric power from the secondary battery; and
a control section controlling supplying of the electric power from the secondary battery to the one or more electric devices.
11. An electric power tool comprising:
the secondary battery according to claim 1 ; and
a moveable section being supplied with electric power from the secondary battery.
12. An electronic apparatus comprising:
an electric power supply source including the secondary battery according to claim 1 .