Electrode for secondary battery
AssigneeMitsubishi Petrochemical Co., Ltd.
InventorsMitsutaka Miyabayashi, Manabu Hayashi
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Abstract
An electrode for a secondary battery is described comprising an alkali metal carried on a carrier composed mainly of a carbonaceous material satisfying the following characteristics (1) and (2), and having a multiphasic structure comprising a nucleus and a surface layer around the nucleus, (1) a true density .rho. of 1.80 g/cm.sup.3 or more, and (2) in the Raman spectrum analysis using an argon ion laser beam with a wavelength of 5145 .ANG., it has a peak P.sub.A in the range of 1580 to 1620 cm.sup.-1 and a peak P.sub.B in the range of 1350 to 1370 cm.sup.-1, and the ratio of intensity I.sub.B Of the P.sub.B to intensity I.sub.A of the P.sub.A, R=I.sub.B /I.sub.A iS 0.4 or more.
Claims19
An electrode for secondary battery, comprising an alkali metal which is an active substance carried on a carrier comprising as a main component a carbonaceous material, and having a multi-phasic structure comprising a nucleus and a surface layer on the nucleus and satisfying the following:
- (1) a true density .rho. is 1.80 g/cm.sup.3 or more, and
- (2) in the Raman spectrum analysis using an argon ion laser beam with a wavelength of 5145 .ANG., it has a peak P.sub.A in the range of 1580 to 1620 cm.sup.-1 and a peak P.sub.B in the range of 1350 to 1370 cm.sup.-1, and the ratio of intensity I.sub.B of the P.sub.B to intensity I.sub.A of the P.sub.A, R=I.sub.B /I.sub.A is 0.4 or more,
- wherein the plane spacing d.sub.002 of said nucleus is less than 3.45 .ANG. and the plane spacing d.sub.002 of said surface layer is 3.45 .ANG. or more.
Dependencies are inferred from the claim text.