JPS62126556A - Manufacture of nonaqueous solvent battery - Google Patents

Abstract

PURPOSE:To increase performance after storage by immersing manganese dioxide in aqueous solution whose lithium ion concentration is specified, drying, and using as positive active material. CONSTITUTION:Manganese dioxide is immersed in an aqueous solution whose lithium ion concentration is 0.05-0.2mol/l, and dried to remove moisture, and a positive electrode 1 is prepared by using the manganese dioxide as positive active material. The positive electrode 1 is combined with a negative electrode such as lithium and a separator to form a nonaqueous solvent battery. By immersing manganese dioxide in a solution whose lithium ion concentration is specified, the solution penetrates into the inside of manganese dioxide. Therefore, insufficient immsesion caused by defloculation on the surface of manganese dioxide particle is eliminated, the storage life and discharge performance of nonaqueous solvent battery are increased.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to an improvement in a method for manufacturing a non-aqueous solvent battery using manganese dioxide as a positive electrode active material.

[Conventional technology]

Conventionally, in order to improve discharge performance and storage stability, manganese dioxide for nonaqueous batteries has been immersed in a solution containing ions such as lithium, sodium, and potassium, and then heat-treated (Japanese Patent Publication No. 59-31182). ) has been proposed.

[Problem that the invention seeks to solve]

However, since highly concentrated alkaline solutions such as sodium hydroxide and lithium hydroxide are strongly alkaline, the surface of the manganese dioxide particles peptizes and becomes covered with a colloid, which causes lithium ions to diffuse into the interior of the manganese dioxide particles. is suppressed. Furthermore, peptization of the surface of the manganese dioxide particles has the disadvantage that the rinsing operation after immersion becomes extremely difficult. Therefore, in batteries, deterioration in performance due to storage has been a major problem.

[Means for solving problems]

In order to improve the above-mentioned drawbacks of batteries that use manganese dioxide as a positive electrode active material by treating manganese dioxide in an aqueous solution containing an alkali metal, the present invention has developed manganese dioxide with a lithium ion concentration of 0.05 to 0. It has been found that battery performance after storage can be improved by immersing it in a .2 mol/l aqueous solution and using it as a positive electrode active material.

〔Example〕

Hereinafter, the present invention will be explained based on examples.

Six types of alkaline solutions with lithium hydroxide (monohydrate, Li0H-H,O) concentrations adjusted as shown in Table 1 were prepared, and 100 g of manganese dioxide with an average particle size of 25 μm were added as shown in Table 1.
Add 10100O of alkaline solution, stir for 20 minutes while heating to 60°C, filter through r
After drying at 0°C for 3 hours, it was further heat-treated at 350°C for 24 hours to remove moisture content. Six types of alkaline solutions were treated as described above.

100g of the above six types of treated manganese dioxide and 1 part graphite
A positive electrode mixture was prepared by adding 0 g of fluororesin powder and 2I of fluororesin powder, kneading, and molding the mixture to a weight of Ig, a diameter of 15 mm, and a thickness of 1.5 mm. The drawing shows a longitudinal cross-sectional view of the battery, and numeral 1 indicates the positive electrode obtained in this example.

2 is a lithium negative electrode, and 3 is a mixed solvent of propylene carbonate and dimethoximitane containing 1 mol/mol of lithium perchlorate.
4 is a stainless steel cathode can housing the cathode, 5 is a stainless steel anode lid housing the anode 2, and 6 is a separator made of a polypropylene nonwoven fabric impregnated with a nonaqueous electrolyte dissolved in a ratio of It is a polypropylene gasket.

Assemble six types of batteries using the configuration shown above.

Immediately after manufacture and after storage at 60°C for one month, each battery was subjected to continuous discharge of 20' CIKΩ, and the final voltage was 2.
．． Table 2 shows the average duration until Ov.

Table 2 As shown in Table 2, there is no difference immediately after manufacture, but at 60°C
, after storage for one month, the batteries of N1112-5 had I
It has better discharge characteristics than kl and 6. The reason for this is
For batteries No. 2 to 5, the solution containing lithium ions penetrates into the inside of the manganese dioxide, and the immersion effect is large, but in the case of N[11], the concentration of lithium ions is too low, and In this case, peptization of the surface of the manganese dioxide particles occurs, making the immersion effect insufficient.

〔Effect of the invention〕

As mentioned above, the lithium ion concentration, 0.05 to 0.2
The storage characteristics of non-aqueous batteries can be improved by immersing manganese dioxide in a solution of mol/β.

[Brief explanation of drawings]

The drawing is a longitudinal sectional view of an example battery of the present invention.

Claims (1)

[Claims] Manganese dioxide with lithium ion concentration 0.05-0.2
A method for producing a non-aqueous solvent battery, characterized by immersing it in an aqueous solution of mol/l and using it as a positive electrode active material.