JPS59151762A - Nonaqueous electrolyte battery - Google Patents

Abstract

PURPOSE:To obtain a nonaqueous electrolyte battery of the 1.5V system having a negative electrode containing lithium, sodium or the like as an active material and which has a low cost and is excellently interchangeable with an existing silver or mercury battery by using a positive electrode which contains a bismuth-iron compound oxide as an active material. CONSTITUTION:Mixture consisting of bismuch trioxide and ferric oxide in a molar ratio of 1:2 is put in an alumina crucible and sintered in air at 800 deg.C for 20hr to obtain a sintered mixture. Next, the sintered mixture is crushed in a mortar before the crushed mixture is sieved so as to obtain a positive active material which can pass through a sieve of 400 mesh. After the thus obtained active material is mixed with graphite powder used as a conductive agent and fluorine resin powder used as a binder in a ratio of 80:15:5 (by weitht), the mixture is molded before being thermally treated at 300 deg.C for one hour, thereby making a positive electrode. A negative electrode is made by punching a rolled lithium plate into a given dimension. Electrolyte is prepared by dissolving lithium perchlorate in a mixture solvent composed of equal volumes of propylene carbonate and 1,2-dimethoxyethane. A separator consisting of a nonwoven polypropylene fabric is impregnated with the above electrolyte. As shown by graph (A), this battery has a discharge voltage of about 1.5V and its discharge characteristic does not present two steps, indicating that it is interchangeable with an existing silver or mercury battery.

Description

Detailed Description of the Invention (a) Field of Industrial Application The present invention relates to a nonaqueous electrolyte battery having a negative electrode 7 whose active material is a light metal such as lithium or sodium, or an alloy mainly composed of these metals, and particularly relates to a positive electrode. This relates to improvement C of active materials.

(b) Conventional technology As a nonaqueous electrolyte battery, a 3V system using manganese dioxide and fluorocarbon χ as the positive electrode active material has been put into practical use, but on the other hand, 1, 5v
Research on battery systems is being actively conducted. Among the positive electrode active materials for this 1.5V battery, bismuth trioxide has a high energy density and exhibits a discharge voltage of 1.4 to 1.6'V'Y, so it can be said to be a promising active material. However, bismuth trioxide has a material cost of about 10 yen/AH, which is about 10 times higher than cupric oxide or iron sulfide, and has the disadvantage that its discharge characteristics are second-tier.

Object of the Invention The object of the present invention is to propose an inexpensive 1.5V non-aqueous electrolyte battery that has characteristics excellent in compatibility with existing silver batteries and mercury batteries.

B) Structure of the Invention The present invention has been made to achieve the above object, and provides a negative electrode having a Z active material made of a light metal such as lithium or sodium or an alloy mainly composed of these, and a bismuth-iron composite oxide as an active material. A positive electrode and a non-aqueous electrolyte! This paper proposes a non-aqueous electrolyte battery equipped with

(e)) Examples An embodiment of the present invention will be described in detail below.

Example of creating a positive electrode: Commercially available reagents such as bismuth trioxide (Bi205) and ferric oxide (Fe2O2) are mixed in a 7 molar ratio of 1:2 in a mortar. This mixture was placed in a Z aluminum crucible and deposited at 800° C. for 20 hours in 9 atmospheres, and then left to cool. still,
The firing temperature may be about 500°C, but a higher temperature is preferred in order to accelerate the reaction rate, and the firing atmosphere may be an oxidizing atmosphere or an inert atmosphere. Next, the material was ground in the above-mentioned firing mortar and passed through 400 meshes to be used as a positive electrode active material. This active material, graphite powder as a conductive agent, and fluororesin powder as a binder were mixed at a ratio of 80:1.
The mixture was mixed at a ratio of 5:5 (weight ratio), molded, and then heat-treated at 300° C. for 1 hour to obtain a Z positive electrode.

The negative electrode was a rolled lithium plate punched out to a specified size, and the electrolyte was linum perchlorate dissolved in an equal volume mixed solvent of propylene carbonate and 1.2 dimethoxyethane.A separator made of polypropylene nonwoven fabric was used as the negative electrode. It was used after being impregnated with.

The battery dimensions were 11.5111+ in diameter and 5.4 in height.

The figure shows the discharge characteristics of the battery of the present invention (Al), and the discharge conditions are 2.
3.6Ω constant load discharge at 0°C.

In the figure, (B) shows a comparative battery using bismuth trioxide alone as the positive electrode active material, and lot shows a conventional battery using ferric oxide alone as the positive electrode active material.

Is it clearer than the effect diagram of H invention? = The battery of the present invention has a discharge voltage of approximately 1.5V, and has no two-stage discharge characteristics, and is a 1.5V non-aqueous electrolytic battery that is highly compatible with existing silver batteries and mercury batteries. It can be said that it is a liquid battery. In addition, the material cost can be reduced compared to the case of using only bismuth trioxide.

The reason why the discharge voltage characteristics were stable in the battery of the present invention is not clear, but when the positive electrode active material was analyzed by yiI-X rays, bismuth-iron initial oxide B12F+11409 or BiFθ0δ was formed, and these composite oxides It is thought that this contributes to the improvement of characteristics.

In addition, when creating a bismuth-iron composite oxide, the example uses bismuth and iron oxides as starting materials.
It can also be made as a starting material.

[Brief explanation of the drawing]

The drawing shows the discharge characteristics 7 of the battery according to the invention. (AI...Battery of the present invention, (Bl(Cl...Comparative battery. 4g1l To Ji 1 Old 2

Claims (1)

[Claims] (2) A non-aqueous electrolyte battery comprising a negative electrode made of light metals such as lithium and sodium or an alloy Z active material containing these as living bodies, a positive electrode made of a vinylium-iron composite oxide active material, and a non-aqueous electrolyte.