Chemistry: electrical current producing apparatus – product – and – Current producing cell – elements – subcombinations and... – Electrode
Reexamination Certificate
2000-02-18
2002-05-21
Brouillette, Gabrielle (Department: 1745)
Chemistry: electrical current producing apparatus, product, and
Current producing cell, elements, subcombinations and...
Electrode
C429S231100
Reexamination Certificate
active
06391496
ABSTRACT:
BACKGROUND OF THE INVENTION
This application claims the Paris convention priority of Japanese Patent Application No. 11-27934/1999 filed on Feb. 4, 1999, which is incorporated herein by reference.
The present invention relates to a lithium secondary battery, and more particularly, it relates to improvement of an active material for the purpose of providing a lithium secondary battery exhibiting good charge-discharge cycle performance.
As a positive electrode active material of a lithium secondary battery, MoO
3
(molybdenum trioxide) and Nb
2
O
5
(diniobium pentoxide) have been proposed (T. Tsumura, Solid State Ionic, Vol. 104, p. 183 (1997) and Japanese Laid-Open Patent Publication No. 59-90359/1984).
Although MoO
3
belongs to the orthorhombic system and is a comparatively stable oxide among molybdenum oxides, the charge-discharge cycle performance of a lithium secondary battery using MoO
3
as a positive electrode active material is not good. This is because the crystal structure of MoO
3
is largely changed through repeated expansion and shrinkage during charge and discharge. Also, Nb
2
O
5
belongs to the orthorhombic system and is the most stable oxide among niobium oxides, but the charge-discharge cycle performance of a lithium secondary battery using Nb
2
O
5
as a positive electrode active material is not good. This is because the crystal structure of Nb
2
O
5
degrades in a small number of cycles through repeated expansion and shrinkage during charge and discharge.
Accordingly, an object of the invention is providing a lithium secondary battery exhibiting better charge-discharge cycle performance than the lithium secondary battery using MoO
3
or Nb
2
O
5
as a positive electrode active material.
SUMMARY OF THE INVENTION
One lithium secondary battery (first battery) of this invention comprises a positive electrode, a negative electrode and a nonaqueous electrolyte, and one of the positive electrode and the negative electrode includes, as an active material, an orthorhombic composite oxide represented by a composition formula, M
x
Mo
1−x
O
y
(wherein M is at least one transition element selected from the group consisting of Cu, V, Mn, Fe, Co and Ni; 0<x≦0.46; and 2.6≦y≦3.1), or an orthorhombic lithium-containing composite oxide obtained by incorporating lithium into the orthorhombic composite oxide.
Another lithium secondary battery (second battery) of this invention comprises a positive electrode, a negative electrode and a nonaqueous electrolyte, and the positive electrode includes, as an active material, an orthorhombic composite oxide represented by a composition formula, M
x
Nb
2−x
O
y
(wherein M is at least one transition element selected from the group consisting of V, Cr, Mo, W. Mn and Fe; 0<x≦0.6; and 4.7≦y≦5.3), or an orthorhombic lithium-containing composite oxide obtained by incorporating lithium into the orthorhombic composite oxide.
As a result, the invention provides a lithium secondary battery exhibiting better charge-discharge cycle performance than a lithium secondary battery using MoO
3
or Nb
2
O
5
as a positive electrode active material.
REFERENCES:
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patent: 5340670 (1994-08-01), Takami
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Solid State Ionics, T. Tsumura et al., 104, pp. 183-189, 1997.
J. Electrochem. Soc., A. Manthiram et al., vol. 143, No. 7, pp. 143-145, 1996.
Electrochimica Acta., N. Kumagai et al., vol. 28, No. 1, pp. 17-22, 1983.
Journal of Power Sources, N. Kumagai et al., vol. 20, pp. 193-198, 1987.
Denki Kagaku, N. Kumagai et al., vol. 50, No. 8, pp. 704-707, 1982.
Fujitani Shin
Nakajima Hiroshi
Ota Taeko
Watanabe Hiroshi
Brouillette Gabrielle
Ruthkosky Mark
Sanyo Electric Co,. Ltd.
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