JPS59196574A - Nonaqueous electrolyte cell - Google Patents

Abstract

PURPOSE:To improve the electrode characteristic by performing reduction processing previously on the surface of metallic current collector thereby improving the electric contact between the current collector and positive pole agent. CONSTITUTION:A porous metallic current collector 2 for holding positive agent 1 composed of active substance, conductive member and binder is preheated in an electric furnace under hydrogen reductive environment in order to remove oxide formed on the surface. The positive plate and lithium negative plate are wound spirally through a separator composed of polypropylene unwoven cloth to produce an electrode group which is contained in a tubular metallic can then injected with nonaqueous electrolyte and enclosed to constitute a tubular lithium cell.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in the positive characteristics of non-aqueous electrolyte batteries.

A negative electrode containing metal group lithium as an active material, and a positive mixture consisting of a fluoride, a material, and a binder require a gold tiltable body to hold them in contact, and furthermore, this optical surface state is important for the battery. There are two major factors that affect performance.

That is, the battery uses a positive electrode active material such as carbon fluoride.

A positive electrode mixture consisting of fluorides such as copper fluoride, oxides such as manganese dioxide, vanadium pentoxide, and bismuth oxide, conductive materials such as carbon powder, and binders such as synthetic resins, etc.
Porous gold! While holding it in one machine, contact C
In the case of a structure that requires electrical conductivity, the contact resistance between the positive electrode mixture and the current collector in contact with it is between M and small.

As the current collector, a porous metal body such as stainless steel, punched metal such as titanium or aluminum, expanded metal, or steel is generally used. However, in this case, the surface of the stainless steel or titanium metal is covered with oxides such as chromium oxide or titanium oxide, so the contact resistance between the positive electrode mixture and the current collector is large, and the operating voltage during battery discharge is low. It had the disadvantage of poor discharge characteristics.

The present invention is intended to overcome the above-mentioned drawbacks. In other words, by subjecting the surface of the gold porcelain aggregate to a reduction treatment in advance, the electrical contact between the current collector and the positive electrode assembly 1 can be made good, thereby improving the battery characteristics.

The present invention will be explained in detail below. Figure 1 shows a cylindrical spiral @
Showing the Seichair Itagazukuri of the Minister of Oil. These are: (1) a mixture of active materials, a conductive material, and a binder, (2) a porous bamboo aggregate, and (3) metal lead terminals. In order to remove the oxides formed on the surface of the current collector plate, the current collector plate was heated in advance in an electric furnace in a hydrogen gas reducing atmosphere.

Next, the electrode group in which the positive electrode plate and the lithium negative electrode plate were spirally wound with a separator made of non-woven polypropylene interposed was placed in a metal cylindrical can (-), and a non-aqueous electrolyte was injected. A cylindrical lithium battery can be constructed by sealing the battery.An AA-sized cylindrical lithium battery is an example of the non-aqueous electrolyte battery of the present invention when manganese dioxide is used as the positive electrode active material. The discharge characteristics of A) are shown in Figure 2. One discharge was carried out at a constant current of 100 mA at 25°C. Figure t- shows a conventional example in which a current collector that was not subjected to reduction treatment was used, and everything else was exactly the same. The discharge curve of the same size battery (I3) is also shown.

It is clear from FIG. 2 that the battery of the present invention (A) has a higher operating voltage and a larger discharge capacity than the conventional battery (I3). When we measured the internal resistance of the battery 5 before discharging, the battery of the present invention (A) had a resistance of 0.3Ω, whereas the conventional battery (13) had a resistance of 0.6Ω. .

In this book, the characteristics of the pond are excellent.

Gold FA because the oxide layer formed on the next song of Metal Fruit 1B5 was removed by Nagimotoshogetsu 1! This is thought to be due to the improved contact between the positive electrode mixture and the I4+8 electric body, which lowers the internal resistance of the battery, as well as the discharge of the positive electrode mixture, which progresses smoothly and improves the discharge efficiency. .

4 [Simple t9 on page 1, bright Figure 1 (a) shows the non-aqueous correct solution 'r1q of the present invention; (b) is the A-A' cross-sectional view of the positive electrode plate. .

Figure 2 shows an example battery (A) of the present invention and a conventional battery (B)'
It is a comparison diagram of discharge curves.

1... Positive electrode mixture 2... Current collector 3... Name of lead terminal patent applicant Toshiba Battery Corporation Figure 1

Claims (2)

[Claims] (1) In a battery consisting of a negative electrode using lithium as an active material, a positive electrode using a current collector and using a metal oxide as an active material, and a non-aqueous solvent electrolyte, the surface of the metal current collector of the stopper bar A non-aqueous electrolyte battery that can be used after undergoing reduction treatment in advance. (2) The non-aqueous electrolyte battery according to claim 1, wherein the current collector is a metal net.