Secondary battery including anode with a coating containing a SO
View Patent ↗A battery capable of reducing swelling is provided. A battery includes a cathode, an anode and an electrolyte. The anode includes a coating containing a SO 3 -containing compound, and the electrolyte contains an electrolyte salt having reduction power. Therefore, on the surface of the anode, the SO 3 -containing compound is preferentially reduced and decomposed to become a sulfur-containing compound. In the result, decomposition reaction of the electrolyte is prevented.
1. A battery comprising:
a cathode;
an anode; and
an electrolyte, wherein:
the anode includes an anode active material consisting of a carbonaceous material, and a coating formed by any one of a spin coating method and a vapor-phase deposition method, the coating comprising a SO 3 -containing compound expressed by C x H y (SO 3 ) z where x, y, and z are integers of 1 or more,
the electrolyte contains an electrolyte salt having reduction power,
the cathode, the anode, and the electrolyte are included in a film-shaped package member, and
the battery is a secondary battery.
2. The battery according to claim 1 , wherein a sulfur 2p spectrum of the SO 3 -containing compound ranges from about 166 eV to about 169 eV as measured by X-ray photoelectron spectroscopy.
3. The battery according to claim 1 , wherein at least part of the SO 3 -containing compound is reduced by the electrolyte salt to become a sulfur-containing compound.
4. The battery according to claim 3 , wherein the sulfur-containing compound is expressed by C x H y S z where X, Y, and Z are integers of 1 or more, respectively.
5. The battery according to claim 1 , wherein the electrolyte salt is lithium hexafluorophosphate.
6. The battery according to claim 1 , wherein the cathode contains a lithium complex oxide.
7. An anode for a secondary battery comprising:
an anode current collector;
an anode active material layer consisting of a carbonaceous material and provided on at least a portion of the anode current collector; and
a coating on a surface of the anode active material layer comprising a SO 3 -containing compound expressed by C x H y (SO 3 ) z where x, y, and z are integers of 1 or more.
8. The anode according to claim 7 , wherein a sulfur 2p spectrum of the SO 3 -containing compound ranges from about 166 eV to about 169 eV as measured by X-ray photoelectron spectroscopy.
9. The anode according to claim 7 , wherein a sulfur 2p spectrum of the sulfur-containing compound ranges from about 162 eV to about 165 eV as measured by X-ray photoelectron spectroscopy.
10. A battery comprising:
a cathode;
an anode comprising an anode current collector, an anode active material layer consisting of a carbonaceous material and provided on at least a portion of the anode current collector, and a coating on a surface of the anode active material layer comprising a SO 3 -containing compound expressed by C x H y (SO 3 ) z where x, y, and z are integers of 1 or more; and
an electrolyte.
11. The battery according to claim 10 , wherein a sulfur 2p spectrum of the SO 3 -containing compound ranges from about 166 eV to about 169 eV as measured by X-ray photoelectron spectroscopy.
12. The battery according to claim 10 , wherein a sulfur 2p spectrum of the sulfur-containing compound ranges from about 162 eV to about 165 eV as measured by X-ray photoelectron spectroscopy.