Non-aqueous electrolyte secondary battery
A non-aqueous electrolyte secondary battery including: a positive electrode that contains a transition metal oxide capable of absorbing and desorbing lithium ions; a negative electrode that is capable of absorbing and desorbing lithium ions; a porous film that is interposed between the positive electrode and the negative electrode; and a non-aqueous electrolyte, wherein at least one selected from inorganic oxide and polyamide is contained in the porous film, and 5 to 15 vol % of ethylene carbonate is contained in a non-aqueous solvent that is contained in the non-aqueous electrolyte.
1. A non-aqueous electrolyte secondary battery comprising:
a positive electrode that contains a transition metal oxide capable of absorbing and desorbing lithium ions;
a negative electrode that is capable of absorbing and desorbing lithium ions;
a separator and a porous film that are interposed between said positive electrode and said negative electrode; and
a non-aqueous electrolyte, wherein:
said separator is a resin porous sheet,
said porous film contains an inorganic oxide and polyamide,
said non-aqueous electrolyte contains a non-aqueous solvent and a lithium salt that is dissolved in said non-aqueous solvent, and
said non-aqueous solvent contains 5 to 15 vol % of ethylene carbonate.
2. The non-aqueous electrolyte secondary battery in accordance with claim 1 , wherein said porous film is carried on at least one of said positive electrode and said negative electrode.
3. The non-aqueous electrolyte secondary battery in accordance with claim 1 , wherein said porous film is carried on said positive electrode.
4. The non-aqueous electrolyte secondary battery in accordance with claim 1 , wherein said non-aqueous solvent contains sulfolane.
5. The non-aqueous electrolyte secondary battery in accordance with claim 1 , wherein said non-aqueous solvent contains a compound that has a polarity lower than that of ethylene carbonate, and said compound is a chain carbonic acid ester.
6. The non-aqueous electrolyte secondary battery in accordance with claim 1 , wherein said non-aqueous solvent contains fluoroethylene carbonate.
7. The non-aqueous electrolyte secondary battery in accordance with claim 1 , wherein said lithium salt contains lithium bis(pentafluoroethane sulfonyl)imide.
8. The non-aqueous electrolyte secondary battery in accordance with claim 1 , wherein said transition metal oxide is represented by a general formula: Li x Ni 1-y M y O z , where M includes Co and Al, and 0≦x≦1.2, 0.1≦y≦0.3 and 2≦z≦2.3 are satisfied.
9. The non-aqueous electrolyte secondary battery in accordance with claim 1 , wherein said porous film contains at least said polyamide, and said porous film is carried on said separator.