Secondary battery, electrolytic solution, battery pack, electronic device, and electrical vehicle
A secondary battery capable of improving cycle characteristics, conservation characteristics, and load characteristics is provided. The secondary battery includes a cathode, an anode, and an electrolytic solution. A separator provided between the cathode and the anode is impregnated with an electrolytic solution. The electrolytic solution includes one or more of a dicarbonic ester compound, a dicarboxylic compound, a disulfonic compound, a monofluoro lithium phosphate, and difluoro lithium phosphate and one or more of fluorinated lithium phosphate, fluorinated lithium borate, and imide lithium.
1. A secondary battery comprising:
a cathode;
an anode; and
an electrolytic solution,
wherein the electrolytic solution includes a nonaqueous solvent, an electrolyte salt, a compound represented by Formula (5) and a compound represented by Formula (8) as follows:
LiPF 2 O 2 (5)
Li[N(SO 2 F) 2 ] (8)
wherein the electrolyte salt includes LiPF 6 ,
wherein an amount of LiPF 6 is from 0.3 mol/kg to 3.0 mol/kg, both inclusive with respect to the nonaqueous solvent,
wherein an amount of the compound represented by Formula (5) is from 0.001 wt. % to 0.2 wt. %, both inclusive with respect to the nonaqueous solvent, and
wherein a content of the compound shown in Formula (8) in the electrolytic solution is from 0.01 weight percent to 0.5 weight percent both inclusive.
2. The secondary battery according to claim 1 , wherein the anode includes, as an anode active material, a carbon material, a lithium metal, or a material being capable of inserting and extracting lithium ions and having one or more of metal elements and metalloid elements as constituent elements.
3. The secondary battery according to claim 1 , wherein the cathode includes, as the cathode material, a compound having one or more of cobalt, nickel, manganese, and iron as a transition metal element.
4. An electrolytic solution comprising:
a nonaqueous solvent;
an electrolyte salt;
a compound represented by Formula (5) and a compound represented by Formula (8) as follows:
LiPF 2 O 2 (5)
Li[N(SO 2 F) 2 ] (8)
wherein the electrolyte salt includes LiPF 6 ,
wherein the electrolytic solution is used for a secondary battery,
wherein an amount of LiPF 6 is from 0.3 mol/kg to 3.0 mol/kg, both inclusive with respect to the nonaqueous solvent,
wherein an amount of the compound represented by Formula (5) is from 0.001 wt. % to 0.2 wt. %, both inclusive with respect to the nonaqueous solvent, and
wherein a content of the compound shown in Formula (8) in the electrolytic solution is from 0.01 weight percent to 0.5 weight percent both inclusive.
5. A battery pack comprising:
the secondary battery according to claim 1 ;
a control section controlling the secondary battery; and
an outer package containing the secondary battery.
6. An electronic device, the electronic device being supplied with electric power from the secondary battery according to claim 1 .
7. An electrical vehicle comprising:
a conversion unit being supplied with electric power from the secondary battery according to claim 1 , and converting the electric power to drive power of the vehicle; and
a control unit performing information processing related to vehicle control based on information of the secondary battery.
8. The secondary battery according to claim 1 , wherein the electrolytic solution further includes 4-fluoro-1,3-dioxolane-2-one in an amount from 5 wt % to 50 wt %.
9. The secondary battery according to claim 1 , wherein the anode includes graphite.
10. The electrolytic solution according to claim 4 , wherein the electrolytic solution further includes 4-fluoro-1,3-dioxolane-2-one in an amount from 5 wt % to 50 wt %.