Non-aqueous liquid electrolyte and non-aqueous liquid electrolyte secondary battery
View Patent ↗A non-aqueous liquid electrolyte suitable for use in a non-aqueous liquid electrolyte secondary battery comprising a negative electrode and a positive electrode, capable of intercalating and deintercalating lithium ions, and the non-aqueous liquid electrolyte, the negative electrode containing a negative-electrode active material having at least one kind of atom selected from the group consisting of Si atom, Sn atom and Pb atom, wherein the non-aqueous liquid electrolyte comprises a carbonate having at least either an unsaturated bond or a halogen atom.
1. A non-aqueous liquid electrolyte suitable for use in a non-aqueous liquid electrolyte secondary battery, wherein the non-aqueous liquid electrolyte comprises:
5 wt % to 20 wt % of at least one compound selected from the group consisting of fluoroethylene carbonate, 4-(fluoromethyl)-ethylene carbonate, 4,4-difluoroethylene carbonate and 4,5-difluoroethylene carbonate, and
0.01 wt % to 5 wt % of at least one compound represented by formula (E-1):
wherein
X e represents a halogen atom, alkyl group or aryl group, wherein when X e is an alkyl group or aryl group, it may be further substituted with a halogen atom, alkyl group or aryl group,
n represents an integer of 1 or larger and 6 or smaller, wherein when n is 2 or larger, the two or more of X e may be the same or different from each other, wherein two or more X e may be connected to each other to form a ring structure or a cage structure.
2. The non-aqueous liquid electrolyte of claim 1 , wherein at least one of X e is a halogen atom or an aryl group that may be substituted with a halogen atom.
3. The non-aqueous liquid electrolyte of claim 1 , further comprising ethylene carbonate and/or propylene carbonate.
4. The non-aqueous liquid electrolyte of claim 1 , further comprising at least one 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.
5. A non-aqueous liquid electrolyte secondary battery, comprising:
a negative electrode and a positive electrode, capable of intercalating and deintercalating lithium ions, and the non-aqueous liquid electrolyte of claim 1 ,
wherein the negative electrode contains a negative-electrode active material having at least one kind of atom selected from the group consisting of Si atom, Sn atom and Pb atom.
6. A non-aqueous liquid electrolyte secondary battery, comprising a negative electrode, a positive electrode, and the non-aqueous liquid electrolyte of claim 1 .
7. A non-aqueous liquid electrolyte suitable for use in a non-aqueous liquid electrolyte secondary battery,
wherein the non-aqueous liquid electrolyte comprises:
5 wt % to 20 wt % of at least one compound selected from the group consisting of fluoroethylene carbonate, 4-(fluoromethyl)-ethylene carbonate, 4,4-difluoroethylene carbonate and 4,5-difluoroethylene carbonate, and
0.01 wt % to 5 wt % of at least one compound represented by formula (E-2):
R e1 , R e2 and R e3 represent, independently of each other, hydrogen atom, or an alkyl group that may be substituted with a halogen atom, wherein two or three of R e1 , R e2 and R e3 may be connected to each other to form a ring structure or cage structure, wherein none of or one of R e1 , R e2 and R e3 is hydrogen atom,
Y e represents a halogen atom, alkyl group or aryl group, wherein when Y e is an alkyl group or aryl group, it may be further substituted with a halogen atom, alkyl group or aryl group,
m represents an integer from 0 to 5, wherein when m is 2 or larger, the two or more of Y e may be the same or different from each other, wherein two or more Y e may be connected to each other to form a ring structure or cage structure.
8. The non-aqueous liquid electrolyte of claim 7 , wherein at least one of Y e is a halogen atom, or an aryl group that may be substituted with a halogen atom.
9. The non-aqueous liquid electrolyte of claim 7 , further containing ethylene carbonate and/or propylene carbonate.
10. The non-aqueous liquid electrolyte of claim 7 , further comprising at least one 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.
11. A non-aqueous liquid electrolyte secondary battery, comprising: a negative electrode and a positive electrode, capable of intercalating and delntercalating lithium ions, and the non-aqueous liquid electrolyte of claim 7 , wherein the negative electrode contains a negative-electrode active material having at least one kind of atom selected from the group consisting of Si atom, Sn atom and Pb atom.
12. A non-aqueous liquid electrolyte secondary battery, comprising a negative electrode, a positive electrode, and the non-aqueous liquid electrolyte of claim 7 .