Electrolytic solution and battery
View Patent ↗An electrolytic solution capable of inhibiting self-discharge even under the high temperatures and a battery using the electrolytic solution are provided. A spirally wound electrode body in which a cathode and an anode are wound with a separator in between and spirally wound is included inside the battery can. An electrolytic solution is impregnated in the separator. The electrolytic solution contains ethylene sulfite, vinylene carbonate, LiPF 6 , and a light metal salt such as lithium difluoro[oxalato-O,O′]borate in a given range. Thereby, the self-discharge can be inhibited even under the high temperatures.
1. An electrolytic solution comprising (a) an ethylene sulfide, (b) a vinylene carbonate, (c) a LiPF 6 , and (d) a compound represented by a Chemical formula 1:
where,
R11 represents a —C(═O)—R21-C(═O)-group;
R21 represents an alkylene group, an alkylene halide group, an arylene group, or an arylene halide group, or a —C(═O)—C(═O)-group;
R12 represents a halogen group, an alkyl group, an alkyl halide group, an aryl group, or an aryl halide group;
each of X11 and X12 represent oxygen (O) or sulfur (S);
M11 represents a transition metal element, a 313 Group element, a 413 Group element, or a 513 Group element in the short period periodic table;
M21 represents an IA Group element or a 2A Group element in the short period periodic table or aluminum (Al);
a represents an integer number from 1 to 4;
b represents an integer number from 0 to 8m; and
each of c, d, e and f represent an integer number from 1 to 3,
wherein,
the ethylene sulfide content is in the range from 0.1 wt % to 3 wt %,
the vinylene carbonate content is in the range from 0.1 wt % to 5 wt %,
the LiPF 6 content is in the range from 10 wt % to 18 wt %, and
the content of the light metal salt shown in Chemical formula 1 is in the range from 0.025 wt % to 1 wt %.
2. The electrolytic solution according to claim 1 , wherein the light metal salt shown in Chemical formula 1 includes lithium difluoro[oxalato-O,O′]borate shown in Chemical formula 2
3. A battery comprising:
a cathode;
an anode; and
an electrolytic solution comprising (a) an ethylene sulfide, (b) a vinylene carbonate, (c) a LiPF 6 , and (d) a compound represented by a Chemical formula 3:
where,
R11 represents a —C,(═O)—R21-C(═O)-group;
R21 represents an alkylene group, an alkylene halide group, an arylene group, or an arylene halide group, or a —C(═O)—C(═O)-group;
R12 represents a halogen group, an alkyl group, an alkyl halide group, an aryl group, or an aryl halide group;
each of X11 and X12 represent oxygen (O) or sulfur (S);
M11 represents a transition metal element, a 3B Group element, a 413 Group element, or a 513 Group element in the short period periodic table;
M21 represents an 1A Group element or a 2A Group element in the short period periodic table or aluminum (Al);
a represents an integer number from 1 to 4;
b represents an integer number from 0 to 8 m:
each of c, d, e and P represent an integer number from 1 to 3, and
wherein,
in the electrolytic solution, the ethylene sulfide content is in the range from 0.1 wt % to 3 wt %,
the vinylene carbonate content is in the range from 0.1 wt % to 5 wt %,
the LiPF 6 content is in the range from 10 wt % to 18 wt %, and
the content of the light metal salt shown in Chemical formula 3 is in the range from 0.025 wt % to 1 wt %.
4. The battery according to claim 3 , wherein the compound represented by Chemical formula 3 includes lithium difluoro[oxalato-O,O′]borate shown in Chemical formula 4