Non-aqueous electrolytic solution and non-aqueous electrolyte secondary battery using the same
An object of the present invention is to provide a non-aqueous electrolytic solution which can improve a non-aqueous electrolyte secondary battery in high-temperature storage characteristics and load characteristics, and a non-aqueous electrolyte secondary battery using the non-aqueous electrolytic solution. The present invention is directed to a non-aqueous electrolytic solution for use in a non-aqueous electrolyte secondary battery which comprises a positive electrode and a negative electrode each being capable of having occluded therein and releasing metal ions, wherein the non-aqueous electrolytic solution contains an electrolyte, a non-aqueous solvent, and a compound represented by the following general formula (A): wherein each of R 1 , R 2 , and Y represents a hydrocarbon group having 1 to 12 carbon atoms and optionally having a substituent, and X represents a hydrogen or fluorine atom, wherein R 1 , R 2 , and Y are the same or different.
1. A non-aqueous electrolytic solution suitable for use in a non-aqueous electrolyte secondary battery which comprises a positive electrode and a negative electrode each being capable of having occluded therein and releasing metal ions, the non-aqueous electrolytic solution containing:
an electrolyte, which is an alkali metal salt;
a non-aqueous solvent; and
a compound represented by general formula (A):
wherein:
R 1 , R 2 , and Y each independently represents a hydrocarbon group having 1 to 12 carbon atoms and optionally having a substituent selected from the group consisting of a cyano group, an isocyanato group, an acyl group (—(C═O)—Ra), an acyloxy group (—O(C═O)—Ra), an alkoxycarbonyl group (—(C═O)O—Ra), a sulfonyl group (—SO 2 —Ra), a sulfonyloxy group (—O(SO 2 )—Ra), an alkoxysulfonyl group (—(SO 2 )—O—Ra), an alkoxycarbonyloxy group (—O—(C═O)—O—Ra), an ether group (—O—Ra), an acryl group, a methacryl group, a halogen, and a trifluoromethyl group,
where Ra represents an alkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, or an alkynyl group having 2 to 10 carbon atoms; and
X represents a hydrogen or fluorine atom,
wherein an amount of the compound represented by formula (A) is 0.001 to 10% by mass, based on the mass of the non-aqueous electrolytic solution.
2. The non-aqueous electrolytic solution according to claim 1 , wherein, in the general formula (A), X is a hydrogen atom.
3. The non-aqueous electrolytic solution according to claim 1 , wherein, in the general formula (A), each of R 1 , R 2 , and Y represents a hydrocarbon group having 1 to 12 carbon atoms and having no substituent.
4. The non-aqueous electrolytic solution according to claim 1 , wherein, in the general formula (A), each of R 1 , R 2 , and Y represents an alkyl group having 1 to 12 carbon atoms and having no substituent.
5. The non-aqueous electrolytic solution according to claim 1 , which further comprises at least one additive selected from the group consisting of a cyclic carbonate having a carbon-carbon unsaturated bond, a cyclic carbonate having a fluorine atom, a nitrile compound, an isocyanate compound, a compound having an isocyanuric acid skeleton, a fluorinated salt, an acid anhydride compound, an acrylate compound, an aromatic compound, a cyclic ether compound, an oxalato salt, and a cyclic sulfonic ester.
6. The non-aqueous electrolytic solution according to claim 1 , wherein the non-aqueous solvent comprises a linear carboxylate.
7. A non-aqueous electrolyte secondary battery comprising a positive electrode and a negative electrode each being capable of having occluded therein and releasing metal ions, and a non-aqueous electrolytic solution, wherein the non-aqueous electrolytic solution is the non-aqueous electrolytic solution according to claim 1 .
8. The non-aqueous electrolyte secondary battery according to claim 7 , wherein a negative electrode active material of the negative electrode capable of having occluded therein and releasing metal ions has carbon as a constituent element.
9. The non-aqueous electrolyte secondary battery according to claim 7 , wherein a negative electrode active material of the negative electrode capable of having occluded therein and releasing metal ions has silicon (Si) or tin (Sn) as a constituent element.
10. The non-aqueous electrolyte secondary battery according to claim 7 , wherein a negative electrode active material of the negative electrode capable of having occluded therein and releasing metal ions is a mixture or composite of metal particles capable of forming an alloy together with Li and graphite particles.