Non-aqueous liquid electrolyte and non-aqueous liquid electrolyte secondary battery

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, and
• at least one member selected from the group consisting of (A), (C), (D) and (E):
• (A) at least one lithium salt selected from LiPF6 and LiBF4 (hereinafter referred to as “the first lithium salt”) and at least one additional lithium salt, which is different from the first lithium salt, represented by formula (A-1) (hereinafter referred to as “the second lithium salt”):
• Li1(αmXan) (A-1)
• wherein
• l represents an integer of 1 to 10,
• m represents an integer of 1 to 100,
• n represents an integer of 1 to 200,
• α represents an atom selected from the group consisting of boron atom, carbon atom, nitrogen atom, oxygen atom and phosphorus atom, wherein when m is 2 or larger, the two or more of a may be the same as or different from each other, and
• Xa represents a functional group having at least one kind of atom selected from the 14 group to 17 group of the periodic table at its binding position to the α, wherein when n is 2 or more, the two or more of Xa may be the same or different from each other, and wherein two or more Xa may be connected to each other to form a ring structure, except such a compound that α is boron atom and Xa is represented by
• (CiH2(i-2)O4)(CjH2(j-2)O4)
• wherein i and j each represent, independently of each other, an integer of 2 or more,
• (C) at least one chain compound having one or more sulfur-containing functional groups represented by formula (C-1):
• wherein
• m and n represent, independently of each other, an integer of 0 or 1,
• x represents an integer of 1 or 2, and
• y represents an integer from 0 to 2,
• (D) at least one organic phosphorous compound represented by formula (D-1):
• wherein
• p and q represent, independently of each other, an integer of 0 or 1, and
• Rd1, Rd2 and Rd3 represent, independently of each other, a hydrocarbon group, which may have a halogen atom, with a carbon number of 1 to 20, wherein any two of Rd1, Rd2 and Rd3 may be connected to each other to form a ring structure,
• (E) At least one kind of compound represented by formula (E-1):
• wherein
• Xe represents a halogen atom, alkyl group or aryl group, wherein when Xe 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 Xe may be the same or different from each other. In addition, two or more Xe may be connected to each other to form a ring structure or a cage structure.