JPS59108269A - Organic electrolyte battery - Google Patents

Abstract

PURPOSE:To improve voltage flatness by using CuxFeS2 (0<x<1) as the positive active substance. CONSTITUTION:Mixtures mixing powders of Cu, Fe and S in various rates are sealed in the vacuumed quartz glass tube, CuxFeS2 obtained by thermal reaction for 5hr at 700 deg.C, acetylene black used as the conductive material and polytetrafluoric ethylene used as a binder are mixed in the weight ratio of 100:5:7. It is then pressurizingly filled in the expanded metal made of nickel. Thereby, an electrode sheet in the thickness of 0.35mm. can be formed and it is then punched in diameter of 5.8mm. for the use as the positive terminal. With such positive terminal, a button type battery has been assembled. As is apparent from the discharge curve when discharge is carried out through a constant resistor of 50kOMEGA at 20 deg.C, the batteries by this invention B(X=0.75), C(X=0.5) and D(X=0.25) are all superior in the voltage flatness characteristic to the conventional CuFe S2A and FeS2E.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to organic electrolyte batteries, and particularly to improvements in positive electrode active materials thereof.

Structures of conventional examples and their problems Organic electrolyte batteries using F e S 2 or Cu F e S 2 as positive electrode active materials have very low theoretical electric capacity per unit volume, and when combined with a lithium negative electrode. Its discharge voltage is 1.4 to 1.5V, and it has features such as being compatible with conventional silver oxide batteries.

Shikatsu-C1 is attracting attention as a power source for electronic watches.

Fluctuations in the battery voltage used in electronic watches have a major impact on their performance. Therefore, a battery with less variation in discharge pressure is required.

However, organic electrolyte lithium batteries using Fe b 2 or Cu Fe S 2 as positive electrode active materials have a problem in flatness of discharge pressure. That is, in the case of FeS 2, this discharge mechanism is FeS +4Li→L4zFeS
2+2Li→2Li2S+Fe, the discharge curve becomes two steps, and there is a problem in terms of accuracy of the watch as described above.

Unlike Fe S 2, the discharge curve of Cu Fe S 2 is a single-stage curve, but the voltage flatness is poor, and F
It had the same problem as eS2.

OBJECTS OF THE INVENTION The object of the present invention is to improve the discharge characteristics, particularly the voltage flatness, of M electrolyte batteries.

Structure of the Invention The present invention uses CuxFeS2 (Ox
1) is used.

This Cu xk' e b 2 is obtained as a compound with various X values by subjecting a mixture of powders of Uu, Fe, and S to a heating reaction.

Description of Examples A mixture of powders of Cu, Fe, and S in various proportions was vacuum sealed in a quartz glass tube, and then heated to 7o.

A heating reaction was carried out at ℃ for 5 hours to obtain CuXFe52 of various X values. The obtained sample was confirmed to be a compound by X-ray diffraction.

Here, Cux" S2, the conductive material acetelene furanok, and the binder poly(47-ethylene) were mixed at a weight ratio of 1'OO:5Nia, and this was added to the expanded metal made of nickel. A sheet-like electrode with a thickness of 0.35 mm was prepared by pressing and filling, and this was punched out to a diameter of 5.8 mm to form a positive electrode.

Assembled the pond. In Figure 1, 1 is an outer diameter 8 made of nickel-plated stainless steel with a thickness of 0.15 m.
．． 50, a sealing plate with a height of 0.60 m+n, and a negative electrode 2 made of metallic lithium with a diameter of 6.5 mm and a thickness of 0.25 mm is crimped onto its roughened inner surface. 3 is a separator made of polypropylene nonwoven fabric, F[propylene 1,
It is impregnated with an electrolytic solution in which 1 mole of lithium perchlorate is dissolved in a solvent mixed with 2 dimethoxyethane at a volume ratio of 1=1. 4 is the above-mentioned positive electrode, and one side thereof has the above-mentioned expanded metal 5 as a current collector.

6 is a case made of nickel-plated stainless steel with a thickness of 0.15 mm and has an outer diameter of 9.5 mm and a height of 1.3 mm, and holder is a polypropylene gasket.

FIG. 2 shows discharge curves when batteries prepared using the various positive electrodes described above were subjected to constant resistance discharge of soKΩ at 20°C. In addition, E is commercially available F' e S 2 as a positive electrode active material.
represents the characteristics of a battery using

As is clear from this figure, CuXFe52 (0 x x 1) is different from conventional Cu Fe S 2 and F' e S
It can be seen that the voltage flatness is extremely superior to that of 2.

Sometimes, as the value of X becomes smaller, the discharge voltage and discharge capacity improve. This is (/ u XF e S
It is thought that this is because by reducing the Cu content of Cuxke S2, the interaction of lithium ions to Cuxke S2 in the discharge reaction proceeds more smoothly.

Effects of the Invention As described above, according to the present invention, it is possible to obtain an organic electrolyte battery that has excellent voltage flatness during discharge and is suitable for electronic watches and the like.

[Brief explanation of drawings]

FIG. 1 is a partially sectional side view of a battery according to the present invention, and FIG. 2 shows discharge curves of batteries using various positive electrodes. 2... Negative electrode, 3... Separator, 4...
...Positive electrode. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
figure

Claims (1)

[Claims] An organic electrolyte battery comprising a positive electrode using Cu x Fe 82 (0<x<1) as an active material, a negative electrode using a light metal as an active material, and an organic electrolyte.