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Nonaqueous secondary battery

Imported: 23 Feb '17 | Published: 22 Apr '03

Naoya Nakanishi, Kouichi Satoh, Kazuyasu Fujiwara, Toshiyuki Nohma, Ikuo Yonezu

USPTO - Utility Patents

Abstract

In the nonaqueous secondary battery of this invention, a positive electrode includes, as an active material, a composite oxide represented by a composition formula, Li

xMn

2−y−zNi

yM

zO

q, wherein M is at least one element selected from the group consisting of B, Mg, Al, Ti, V, Fe, Co, Cu, Zn, Ga, Y, Zr, Nb, Mo and In; 1.20≦x≦1.80; y≧0.10; z≧0; y+z≦1.90; and 3.70≦q≦4.30, in a discharge state during fabrication of the nonaqueous secondary battery. As a result, the nonaqueous secondary battery can exhibit good charge-discharge cycle performance and can be fabricated at low cost.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

A more complete appreciation of the invention and many of the attendant advantages thereof will be readily obtained as the same become better understood by reference to the following detailed description when considered in connection with the accompanying drawing, wherein:

FIG. 1 is a sectional view of a nonaqueous secondary battery fabricated in an embodiment.

Claims

1. A nonaqueous secondary battery requiring charge before initial discharge comprising a positive electrode, a negative electrode and a nonaqueous electrolyte,

2. The nonaqueous secondary battery according to claim 1, wherein 1.30≦x≦1.70.

3. The nonaqueous secondary battery according to claim 1, wherein 1.40≦x≦1.60.

4. The nonaqueous secondary battery according to claim 1, wherein 0.20≦y≦1.00.

5. The nonaqueous secondary battery according to claim 1, wherein 0≦z≦0.20.