JPS60253165A - Non-aqueous electrolyte battery - Google Patents

Abstract

PURPOSE:To obtain a titled battery which shows excellent low temperature discharge characteristic after the storing by utilizing non-aqueous electrolyte obtained by dissolving lithiumtrifluoromethanesulphonate into the mixed solvent including propylenecarbonate and dioxolane. CONSTITUTION:A solvent forming non-aqueous electrolyte is prepared as a mixed solvent including propylene carbonate and dioxolane and a solute is lithiumtrifluoromethanesulphonate. For example, the solution obtained by dissolving lithiumtrifluoromethanesulphonate of 1mol/litterk to the mixed solvent of propylenecarbonate and dioxolane with mixing ratio of 1:1 is used as the electrolyte. The positive electrode can be obtained by pressurizingly molding a mixture of manganese dioxide which has been heat-processed as the active subtance, carbon powder as conductive agent and fluorine resin powder as a bindier mixed in the weight ratio of 85:10:5, while the negative electrode can be obtained by punching a lithium rolled plate in the predetermined size.

Description

Detailed Description of the Invention (a) Field of Industrial Application The present invention relates to a negative electrode using lithium or a lithium alloy as an active material, a positive electrode using a metal oxide, sulfide, halide, etc. as an active material, and a solvent. The present invention relates to a non-aqueous electrolyte battery comprising a non-aqueous electrolyte comprising a solute and a solute, and particularly relates to improvements in the non-aqueous electrolyte.

(B) Prior Art Various solvents and solutes have been proposed for forming the non-aqueous electrolyte used in this type of battery.

Specifically, as disclosed in Japanese Patent Publication No. 57-52866, propylene carbonate, r-gutyrolactone, dimethoxyethane, dioxocone, tetrahydromiturane, etc. are used as solvents, and lyticum perchlorate, borofluoride, etc. are used as solutes. Chikum is also known.

Now, in recent years, as the fields of application of this type of battery have expanded, there has been a demand for improvements in battery characteristics.9. One of the improvements is the improvement in low-temperature discharge characteristics after storage.

(c) Purpose of the Invention The object of the present invention is to provide a non-aqueous electrolyte battery that improves the non-aqueous electrolyte and has excellent low-temperature discharge characteristics after storage.

B) Structure of the Invention The present invention comprises a negative electrode using lithium or a lithium alloy as an active material, a positive electrode, and a non-aqueous electrolyte comprising a solvent and a solute, wherein the solvent is propylene carbonate or not. ): A mixed solvent containing t-xolane, and the solute is lithium trifluoromethanesulfonate.

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

A mixed solvent of propylene carbonate (pa) and dioxocune (r) OXL) mixed at a mixing ratio of 1:1 was used as a solvent, and lithium and mutrifluoromethanesulfonate (L1075sOIs) were added as a solute to this mixed solvent.
The solution dissolved in mol/l is considered as 1 electrolyte solution.

The positive electrode is made of manganese dioxide heat-treated at a temperature range of 550 to 4'50°C as an active material, and this manganese dioxide is mixed with carbon powder as a conductive agent and fluororesin powder as a binder in a weight ratio of 85:10:5. The mixture was pressure-molded and heat-treated at 250-55[1°C], and the negative electrode was a lithium rolled plate punched out to the specified dimensions, with a diameter of 20.0-5 and a thickness of 2.5 IN. Battery capacity 120mA
A battery of the present invention of H is obtained. This battery is called A.

Next, in order to investigate the superiority of the battery of the present invention, lithium perchlorate (Li0704) was used as a solute.
LiBF4), lithium hexafluorophosphate (
LiP16) and lyticumtetoc gloroaluminate (
LiAJC7a) @ used respectively.

A comparative battery was prepared in which the other elements were the same as in the example.

Let these batteries be IB, C, D, and E.

Figure 1 and Figure 9j42 are discharge characteristic diagrams of these batteries, and Figure 1 shows the discharge characteristics of these batteries.
Fig. 182 is a discharge characteristic diagram when discharging with a constant resistance of 5 Ω at -20 °C after being stored at 60 °C for 5 months after assembling the expanded battery. .

As is clear from Figure $1 and Figure s2, the superiority of the battery of the present invention is not so apparent in the low-temperature discharge characteristics immediately after battery assembly, but the superiority of the battery of the present invention is more pronounced in the low-temperature discharge characteristics after storage. be.

The table below shows the viscosity of each electrolytic solution used in the batteries of the present invention and comparative batteries immediately after preparation and after storage at 60° C. for 5 months.

Table Considering the reason why the battery of the present invention has excellent low-temperature discharge characteristics after storage, as can be seen from the table above, the electrolyte used in the comparative battery gels with storage, increases viscosity, and decreases conductivity. On the other hand, an important factor is considered to be that the electrolytic solution used in the battery of the present invention maintains its initial viscosity even after storage and does not exhibit a decrease in electrical conductivity.

Figure 3 shows the mixing ratio DO× of the mixed solvent in the battery of the present invention.
The L/PO ratio is preferably in the range of 20 to 80/B to 2 (1f).

(F) Effects of the Invention As mentioned above, according to the present invention, a non-aqueous electrolyte battery with excellent low-temperature discharge characteristics after storage can be obtained.
This is extremely helpful in expanding the uses of this type of battery.

[Brief explanation of the drawing]

Figures 1 and 2 are discharge characteristic diagrams of batteries at low temperatures. Figure 1 is an initial discharge characteristic diagram, and Figure 2 is a discharge characteristic diagram after storage at 60°C for 6 months. FIG. 5 shows the mixing ratio of the mixed solvent in the battery of the present invention. It is a figure which shows the relationship with the discharge capacity of the battery after storage at 60 degreeC for 5 months. k...Battery of the present invention, ■)(C))(E)...Comparison battery. Applicant Sanyo Denki AA company agent Patent attorney Shizuo Sano Figure 1 Figure 2 Figure 3 PC100806040200 Mixed @; f4r>Kan ratio

Claims (1)

[Claims] (2) A device comprising nine electrodes using lithium or a lithium alloy as an active material, a positive electrode, and a non-aqueous electrolyte consisting of a solvent and a solute, wherein the solvent is a mixed solvent containing propylene carbonate and dioxocane; A nonaqueous electrolyte battery characterized in that the solute is lithium trifluoromethanesulfonate.