US 4,668,595 AGranted

Secondary battery

AssigneeAsahi Kasei Kogyo Kabushiki Kaisha

InventorsAkira Yoshino, Kenichi Sanechika, Takayuki Nakajima

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Abstract

This invention provides a secondary battery in a nonaqueous type using a substance indicated in I below and/or a substance indicated in II below as an active material for either of positive and negative electrodes: I: a composite oxide possessing a layer structure and represented by the general formula: A.sub.x M.sub.y N.sub.z O.sub.2 wherein A stands for at least one alkali metal, M for a transition metal, N for at least one member selected from the group consisting of Al, In, and Sn, and x, y, and z respectively for the number falling in a specific range, II: an n-doped carbonaceous material which has a BET-method specific surface area, and a crystal thickness, Lc, in the X-ray diffraction and a true density, .rho., both having the values falling in a specific range. The secondary battery of this invention is small and light, excels in cyclicity and self-discharging property, and possesses a high energy density.

Claims20

Dependent claims

A secondary battery comprising positive and negative electrodes, a separator, and a nonaqueous electrolyte, wherein said secondary battery is characterized by having as an active material for either of said positive and negative electrodes:

I:
a composite oxide possessing a layer structure and represented by the general formula:
A.sub.x M.sub.y N.sub.z O.sub.2
wherein A is at least one member selected from the group consisting of alkali metals, M is a transition metal, N is at least one member selected from the group consisting of Al, In, and Sn, and x, y, and z satisfy the expression, 0.05.ltoreq.x.ltoreq.1.10, 0.85.ltoreq.y.ltoreq.1.00, and 0.001.ltoreq.z.ltoreq.0.10, respectively, and
II:
an n-doped carbonaceous material which has a BET-method specific surface area, A (m.sup.2 /g), being in the range of 0.2<A<100 and a crystal thickness, Lc (.ANG.), based on X-ray diffraction and a true density, .rho. (g/cm.sup.3), which satisfies the conditions, 1.70<.rho.<2.18 and 10<Lc<120.rho.-189.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 06/861,423Filed 9 May 1986
Priority: JP 60-9769510 May 1985
Granted: 26 May 1987
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

H01M 10/05
Secondary cells; Manufacture thereof: accumulators with non-aqueous electrolyte
H01M 4/36
Electrodes composed of, or comprising, active material: selection of substances as active materials, active masses, active liquids
H01M 4/485
Of inorganic oxides or hydroxides: of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy
H01M 4/583
Of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures,…:…