Secondary battery
First Claim
1. 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;
space="preserve" listing-type="equation">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≦
x≦
1.10, 0.85≦
y≦
1.00, and 0.001≦
z≦
0.10, respectively, andII;
an n-doped carbonaceous material which has a BET-method specific surface area, A (m2 /g), being in the range of 0.2<
A<
100 and a crystal thickness, Lc (Å
), based on X-ray diffraction and a true density, ρ
(g/cm3), which satisfies the conditions, 1.70<
ρ
<
2.18 and 10<
Lc<
120ρ
-189.
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Accused Products
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, ρ, 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.
-
Citations
20 Claims
-
1. 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;
space="preserve" listing-type="equation">A.sub.x M.sub.y N.sub.z O.sub.2wherein 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≦
x≦
1.10, 0.85≦
y≦
1.00, and 0.001≦
z≦
0.10, respectively, andII;
an n-doped carbonaceous material which has a BET-method specific surface area, A (m2 /g), being in the range of 0.2<
A<
100 and a crystal thickness, Lc (Å
), based on X-ray diffraction and a true density, ρ
(g/cm3), which satisfies the conditions, 1.70<
ρ
<
2.18 and 10<
Lc<
120ρ
-189. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
-
Specification