Secondary battery, electronic device, electric power tool, electrical vehicle, and electric power storage system
View Patent ↗A secondary battery capable of suppressing resistance rise even after repeated charge and discharge is provided. The secondary battery includes a cathode, an anode, and an electrolytic solution. The anode contains titanium-containing lithium composite as an anode active material, and the electrolytic solution contains cyclic disulfonic acid anhydride.
1. A secondary battery comprising:
a cathode;
an anode; and
an electrolytic solution,
wherein the anode contains one or more of titanium-containing lithium composite oxides expressed by the following Formula 1 to Formula 3 as an anode active material, and
the electrolytic solution contains cyclic disulfonic acid anhydride expressed by the following Formula 4 or cyclic disulfonic acid anhydride expressed by the following Formula 5 or both:
Li[Li x M1 (1−3x)/2 Ti (3+x)/2 ]O 4 Formula 1
where M1 is one or more of Mg, Ca, Cu, Zn, and Sr, and x satisfies 0≦x≦⅓:
Li[Li y M2 1−3y Ti 1+2y ]O 4 Formula 2
where M2 is one or more of Al, Sc, Cr, Mn, Fe, Ga, and Y, and y satisfies 0≦y≦⅓:
Li[Li 1/3 M3 z Ti (5/3)−z ]O 4 Formula 3
where M3 is one or more of V, Zr, and Nb, and z satisfies 0≦z≦⅔:
where R1 to R4 are an alkyl group (C m H 2m+1 : m satisfies 0≦m≦4):
where R5 to R10 are an alkyl group (C n H 2n+1 : n satisfies 0≦n≦4).
2. The secondary battery according to claim 1 , wherein the cyclic disulfonic acid anhydride is 1,2-ethanedisulfonic acid anhydride or 1,3-propanedisulfonic acid anhydride or both.
3. The secondary battery according to claim 1 , wherein a content of the cyclic disulfonic acid anhydride in the electrolytic solution is from 0.1 wt % to 5 wt % both inclusive.
4. The secondary battery according to claim 1 , wherein the electrolytic solution contains halogenated cyclic ester carbonate expressed by the following Formula 6 or unsaturated carbon bond cyclic ester carbonate expressed by the following Formula 7 or both;
where R11 to R14 are a hydrogen group, a halogen group, an alkyl group (C p H 2p+1 : p satisfies 0≦p≦4), or a halogenated alkyl group (C q H 2q+1 X r : X is a halogen, q satisfies 0≦q≦4, and r satisfies 0≦r≦2q+1), and one or more of R11 to R14 are a halogen group or a halogenated alkyl group;
where R15 and R16 are an alkyl group (C s H 2s+1 : s satisfies 0≦s≦4).
5. The secondary battery according to claim 4 , wherein the halogenated cyclic ester carbonate is 4-fluoro-1,3-dioxolane-2-one, and the unsaturated carbon bond cyclic ester carbonate is vinylene carbonate.
6. The secondary battery according to claim 1 , wherein the electrolytic solution contains propylene carbonate as a cyclic ester carbonate.
7. The secondary battery according to claim 1 , wherein the cathode and the anode are layered with a separator in between, and
the separator includes a base material layer as a porous film and a polymer compound layer provided on one or both surfaces of the base material layer.
8. The secondary battery according to claim 7 , wherein the polymer compound layer contains polyvinylidene fluoride.
9. The secondary battery according to claim 1 , wherein the secondary battery is a lithium ion secondary battery.
10. An electronic device using the secondary battery according to claim 1 .
11. An electric power tool using the secondary battery according to claim 1 .
12. An electrical vehicle using the secondary battery according to claim 1 .
13. An electric power storage system using the secondary battery according to claim 1 .