JPS60121672A - Non-aqueous electrolyte battery - Google Patents

Abstract

PURPOSE:To improve characteristics of non-aqueous electrolyte battery by using an electrolytic manganese dioxide specifying the surface area and volume specific gravity as the active substance of positive pole. CONSTITUTION:In a battery providing a negative pole using a light metal such as Li, Na, etc. as the active substance, non-aqueous electrolyte and a positive pole, the electrolytic manganese dioxide having the surface area of 15-30m<2>/g and volume specific gravity of 1.4-1.6kg/cm<2> is used as the active substance of positive pole. Desirably, thickness of this active substance should be about 44mu or less and it must be contained for about 80% or more for the total amount of active substance of positive pole. Use of this positive pole increases discharge capacity of non-aqueous electrolyte battery.

Description

Detailed Description of the Invention (A) Industrial Application Field The present invention relates to a non-aqueous electrolyte battery that includes a negative electrode using light metals such as lithium or sodium as an active material, a non-aqueous electrolyte, and a positive electrode. , particularly regarding improvements in positive electrodes.

(1) Prior art In this type of battery, various materials such as metal oxides, sulfides, and halides have been proposed as active materials for the positive electrode, but among these, manganese dioxide is an abundant resource and is inexpensive and stable. It is seen as promising due to its nature and has been put into practical use.

Manganese dioxide is generally classified into electrolytic manganese dioxide and chemical manganese dioxide, but electrolytic manganese dioxide is said to be superior in terms of battery characteristics.

(c) Purpose of the Invention The purpose of the present invention is to investigate the surface area, bulk specific gravity, and particle size of electrolytic manganese dioxide, find the optimum values, and improve battery characteristics.

B)1 Structure of the Invention The present invention comprises a negative electrode using a light metal such as lithium or sodium as an active material, a non-aqueous electrolyte, and a positive electrode, the positive electrode having a surface area of 15 to 60'/P and a bulk. Specific gravity 1.
EXAMPLE A non-aqueous electrolyte battery characterized by using electrolytic manganese dioxide of 4-i, is'/c as an active material...Example A practical example of the present invention will be described in detail below.

The surface area and bulk specific gravity of electrolytic manganese dioxide heat-treated in the temperature range of 650°C to 460°C were measured, and the surface area was 15 to 460°C.
50/1, bulk specific gravity 14-16'/cn? An electrolytic manganese dioxide within the range of 20% is used as a positive electrode active material, and 85 parts by weight of this positive electrode active material is mixed with 1 part of acetylene black as an electric grinder and 51 parts of fluororesin powder as a binder to form a positive electrode. Use as a combination drug.

And this positive electrode mixture has a diameter of O1! After pressure molding on the positive electrode current collector ring of I at a molding pressure of 5F'/each, it was further heated to 500°C.
Vacuum dry it to use as a positive electrode.

The negative electrode was a lithium rolled plate punched out to a diameter of 20 fli, and the electrolyte was a solution of 1η of lithium perchlorate in an equal volume mixed solvent of propylene carbonate and 12 dimethoxyethane.A separator made of polyglopylene nonwoven fabric was used as the negative electrode. A non-aqueous electrolyte battery according to the present invention was prepared by impregnating the same with a non-aqueous electrolyte battery.

Note that the battery dimensions were 5 mm in diameter and 2.8 N in thickness.

Figure 1 shows the relationship between the surface area of electrolytic manganese dioxide as an active material and the battery discharge capacity during constant load discharge of 560Ω at room temperature, and Figure 2 shows the relationship between the bulk specific gravity of electrolytic manganese dioxide as an active material and , shows the relationship with the battery discharge capacity during 560Ω constant load discharge at room temperature.

From Figures 1 and 2, it can be seen that the surface area and bulk specific gravity of electrolytic manganese dioxide affect the battery discharge capacity; the surface area is 15 to 50/l, and the bulk specific gravity is 1.4 to 1.6'/l. It shows high discharge capacity in the range of 1J.

We also examined the particle size and measured the relationship between the ratio of the electrolytic manganese dioxide active material having a particle size of 44 μ or less to the total active material volume and pressure, and the battery discharge capacity during 560Ω constant load discharge at room temperature. is shown in Figure 3.

From FIG. 5, it can be seen that a high discharge capacity is exhibited when the active material of 44# or less is contained in a proportion of 80 or more to the total active material element.

(f) Effects of the invention As mentioned above, in a non-aqueous electrolyte battery using manganese dioxide as a positive electrode active material, the surface area of manganese dioxide is 15
~50'/g, bulk specific gravity 1. By using electrolytic manganese dioxide of a~1°6'/A, the discharge capacity of the battery can be increased, and its industrial value is extremely large.

The reason for this is that the physical properties of electrolytic manganese dioxide affect the liquid content and filling capacity, and it is thought that the range of surface area and bulk specific gravity of electrolytic manganese dioxide used in the present invention is a well-balanced range.

In terms of particle size, the discharge capacity of the battery can be increased by containing 80q6 or more of the electrolytic manganese dioxide active material with a particle size of 44μ or less based on the total amount of active materials.

[Brief explanation of drawings]

The drawings all show the relationship between the physical properties of electrolytic manganese dioxide using the present invention as the positive electrode active material of the battery and the battery discharge capacity. 0 Applicant SANYO Electric Co., Ltd.

Claims (1)

[Scope of Claims] A negative electrode comprising a light metal such as lithium or sodium as an active material, a non-aqueous electrolyte, and a positive electrode, wherein the positive electrode has a surface area of 15 to 50w17ft and a bulk specific gravity of 14 to 17ft. A powerless electrolyte battery characterized by using electrolytic manganese dioxide of 1.6'/aN as an active material. (2) The non-aqueous electrolyte battery according to claim 0, wherein the positive electrode contains 8095 or more of the active material having a diameter of 44 μm or less based on the total amount of active material.