Nonaqueous electrolytic solution containing additive for increasing capacity of lithium-ion cell and lithium-ion cell using same

A lithium-ion cell comprising:

• a positive electrode containing a lithium-transition metal oxide capable of absorbing and-releasing lithium;
• a carbon-based material capable of absorbing and releasing lithium;
• a negative electrode containing a fluorine resin as an adhesive of said positive and negative electrodes;
• and
• a nonaqueous electrolytic solution,
• wherein said nonaqueous electrolytic solution contains:
• (a) an additive selected from the group consisting of 2-pyrrolidinone compounds represented by the aforementioned (I), the cyclic alkyl compounds represented by the aforementioned formula (II) in an amount of 0.1 to 10% (by weight) based on the amount of said nonaqueous electrolytic solution containing a lithium salt dissolved therein;
• (b) a lithium salt which is one salt or a combination of two or more selected from the group consisting of lithium salts of inorganic acid formed from a lithium ion and an anion selected from PF6 and BF4;
• and lithium-salts of organic acid formed from a lithium ion and an anion selected from those represented by the aforementioned general formula (IV) in a total concentration of 0.5 to 2.5 mol/dm3 in said nonaqueous electrolytic solution;
• and
• (c) a nonaqueous solvent which is two or more compounds selected from the group consisting of a carbonate-based compound, a lactone-based compound, an ether-based compound, a sulfolane-based compound, a dioxolan-based compound, the chain phosphate ester-based compound represented by the aforementioned general formula (V), and the cyclic phosphate ester-based compound represented by the aforementioned general formula (VI).