Non-aqueous liquid electrolyte and non-aqueous liquid electrolyte secondary battery using the same
View Patent ↗A non-aqueous liquid electrolyte secondary battery comprising an anode electrode and a cathode electrode, capable of intercalating and deintercalating lithium ions, and a non-aqueous liquid electrolyte, having high charging capacity, capable of maintaining excellent characteristics over a long period of time and excellent in discharge capacity retention in particular, is provided. The non-aqueous liquid electrolyte contains at least, at least, a carbonate having at least either an unsaturated bond or a halogen atom, and a compound of formula (III-1) A-N═C═O where A represents an element or group other than a hydrogen.
1. A non-aqueous liquid electrolyte to be used for a non-aqueous liquid electrolyte secondary battery comprising a anode electrode and a cathode electrode, capable of intercalating and deintercalating lithium ions, and the non-aqueous liquid electrolyte,
wherein said non-aqueous liquid electrolyte contains, at least, a carbonate having at least either an unsaturated bond or a halogen atom, and a compound of formula (III-1)
A-N═C═ (III-1)
wherein in formula (III-1), A represents an element or group other than a hydrogen wherein said compound of formula (III-1) is selected from the group consisting of a compound of formula (III-2)
wherein in formula (III-2),
X 1 and X 2 represent, independently of each other, an element other than hydrogen,
Z represents an arbitrary element or group,
m and n represent, independently of each other, an integer greater than or equal to 1, and
when m is 2 or greater, each of Z may be the same or different from each other and a compound of formula (III-3)
wherein in formula (III-3),
R represents, independently of each other, an alkyl group or aryl group that may have a substituent. In addition, more than one R may be connected to each other to form a ring.
2. The non-aqueous liquid electrolyte as defined in claim 1 , wherein said compound of formula (III-1) is a compound of formula (III-2)
wherein in formula (III-2),
X 1 and X 2 represent, independently of each other, an element other than hydrogen,
Z represents an arbitrary element or group,
m and n represent, independently of each other, an integer greater than or equal to 1, and
when m is 2 or greater, each of Z may be the same or different from each other.
3. The non-aqueous liquid electrolyte as defined in claim 1 , wherein said compound of formula (III-1) is a compound of formula (III-3)
wherein in formula (III-3),
R represents, independently of each other, an alkyl group or aryl group that may have a substituent. In addition, more than one R may be connected to each other to form a ring.
4. The non-aqueous liquid electrolyte as defined in claim 1 , wherein in said non-aqueous liquid electrolyte, the concentration of said compound represented by formula (III-1) is 0.01 weight % or higher, and 10 weight % or lower.
5. A non-aqueous liquid electrolyte secondary battery comprising an anode electrode and a cathode electrode, capable of intercalating and deintercalating lithium ions, and a non-aqueous liquid electrolyte,
wherein said non-aqueous liquid electrolyte is a non-aqueous liquid electrolyte defined in claim 1 .
6. The non-aqueous liquid electrolyte as defined in claim 1 , wherein the anode electrode contains an anode electrode active material comprising at least one kind of atom selected from the group consisting of Si atom, Sn atom and Pb atom.
7. The non-aqueous liquid electrolyte as defined in claim 6 , wherein said compound of formula (III-1) is a compound of formula (III-2)
wherein in formula (III-2),
X 1 and X 2 represent, independently of each other, an element other than hydrogen,
Z represents an arbitrary element or group,
m and n represent, independently of each other, an integer greater than or equal to 1, and
when m is 2 or greater, each of Z may be the same or different from each other.
8. The non-aqueous liquid electrolyte as defined in claim 6 , wherein said compound of formula (III-1) is a compound of formula (III-3)
wherein in formula (III-3), R represents, independently of each other, an alkyl group or aryl group that may have a substituent and more than one R may be connected to each other to form a ring.
9. The non-aqueous liquid electrolyte as defined in claim 6 , wherein in said non-aqueous liquid electrolyte, the concentration of said compound represented by formula (III-1) is 0.01 weight % or higher, and 10 weight % or lower.
10. The non-aqueous liquid electrolyte as defined in claim 6 , wherein in said non-aqueous liquid electrolyte, the concentration of said carbonate having at least either an unsaturated bond or a halogen atom is 0.01 weight % or higher, and 70 weight % or lower.
11. The non-aqueous liquid electrolyte as defined in claim 6 , wherein said carbonate having an unsaturated bond or a halogen atom is one or more carbonate compounds selected from the group consisting of vinylene carbonate, vinylethylene carbonate, fluoroethylene carbonate, difluoroethylene carbonate and derivatives of these carbonate compounds.
12. The non-aqueous liquid electrolyte as defined in claim 6 , further comprising ethylene carbonate and/or propylene carbonate.
13. The non-aqueous liquid electrolyte as defined in claim 6 , further comprising at least one additional carbonate selected from the group consisting of dimethyl carbonate, ethylmethyl carbonate, diethyl carbonate, methyl-n-propyl carbonate, ethyl-n-propyl carbonate and di-n-propyl carbonate.