Non-aqueous secondary cell
AssigneeHitachi Maxell, Ltd.
InventorsFusaji Kita, Masaharu Higashiguchi, Akira Kawakami
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Abstract
A non-aqueous secondary cell having a positive electrode, an electrolytic solution which contains an organic solvent, and a negative electrode which is made of a carbon material having a ratio of I.sub.O to I.sub.C at least 2, where I.sub.O is a peak intensity of oxygen atoms around 530-540 eV and I.sub.C is a peak intensity of carbon atoms around 285 eV in a photoelectron spectrum of an X-ray photoelectron spectroscopy under conditions of 12 kV and 10 mA, which cell has a small retention, a large capacity, and safety against ignition.
Claims7
A non-aqueous secondary cell comprising:
- a positive electrode, an electrolytic solution which comprises an organic solvent, and a negative electrode which is made of a carbon material having a ratio of I.sub.O to I.sub.C of at least 2, where I.sub.O is a peak intensity of oxygen atoms around 530-540 eV and I.sub.C is a peak intensity of carbon atoms around 285 eV in a spectra obtained by X-ray photoelectron spectroscopy at room temperature under conditions of 12 kV and 10 mA, and said electrolytic solution contains carbon dioxide dissolved therein.
A non-aqueous secondary cell comprising:
- a positive electrode, an electrolytic solution which comprises an organic solvent, and a negative electrode which is made of a carbon material having a ratio of I.sub.o to I.sub.c of at least 2, where I.sub.o is a peak intensity of oxygen atoms around 530-540 eV and I.sub.c is a peak intensity of carbon atoms around 285 eV in a spectra obtained by X-ray photoelectron spectroscopy at room temperature under conditions of 12 kV and 10 mA, and said electrolytic solution comprises a triester of phosphoric acid.
A non-aqueous secondary cell comprising a positive electrode, an electrolytic solution which comprises an organic solvent comprising a triester of phosphoric acid and containing carbon dioxide dissolved therein, and a negative electrode which is made of a carbon material having a ratio of I.sub.o to I.sub.c of at least 2, where I.sub.o is a peak intensity of oxygen atoms around 530-540 eV and I.sub.c is a peak intensity of carbon atoms around 285 eV in a spectra obtained by X-ray photoelectron spectroscopy under conditions of 12 kV and 10 mA.
Dependencies are inferred from the claim text.