JPS58178958A - Lithium secondary cell - Google Patents

Abstract

PURPOSE:To obtain a small secondary cell having high charge/discharge capacity and high energy density, by employing Cu5V2O10 as positive pole active substance, lithium as negative pole active substance and such substance as chemically stable against the positive pole active substance and lithium as electrolyte. CONSTITUTION:When forming the positive pole while empolying Cu5V2O10 as positive pole active substance, the positive pole is formed by pressing Cu5V2O10 powder or compound of said powder and binder such as poly-tetra fluoroethylene over a supporter made of nickel, stainless steel, etc. Negative pole active substance or lithium is made into sheet similarly with conventional lithium cell or said sheet is pressed against a conductor mesh made of nickel, stainless steel, etc. Conventional electrolyte such as compound of non-protic organic solvent and lithium salt such as LiClO4, LiAlCl4, LiBF4, LiCl, LiPF6, LiAsF6, etc. solid electrolyte employing Li<+> as conductive substance or molten salt can be employed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a secondary cell used as a lithium-gold active material for a small-sized photovoltaic secondary battery with large wrinkles.

Many proposals have been made for high-energy 'M+&M+' using lithium as the negative electrode active material, for example, graphite and fluorine O intercalation/compounds as IE net active fibers, and lithium metal as the negative electrode active material. Batteries used for both are known (see U.S. Pat. No. 3,514,337).

My father, a lithium battery using fluorinated graphite as the positive electrode active material (under desk 11) and an IJ IJium battery (Sanyo Electric @#) using manganese dioxide as the positive electrode active material are already commercially available. However, these batteries are primary batteries and cannot be recharged.
There was a drawback that it was not possible.

For secondary batteries used as lithium negative electrode active materials, batteries using titanium, zirconium, hafnium, niobium, tantalum, and vanadium sulfide, selenide, and telluride as positive electrode active materials (US+1vfffg4,
(Refer to No. 009,052, page a) ML Batteries using chromium dioxide, niobium selenide, etc. (Journal of Electrochemical Society, Vol. 124, No. 7, No. 96)
No. 8 and Houki, p. 325, 1977) 4 have been proposed, but these electric power production methods were not necessarily sufficient due to their single-cell characteristics and strength.

A nine-L1 battery using nine-metal panadate as the positive electrode active material is disclosed in U.S. Pat. No. 3,681.143, but in this patent, Cua
Only the structure having the structure ff04)* is shown as Example 7, and there is no description about the charging characteristics.

The present invention has been proposed to improve the above-mentioned situation, and is round.
The purpose is to provide a secondary battery that is compact and has excellent characteristics. In a battery that achieves the above object of the present invention, the positive electrode active material is Cus Vt O+.

The negative electrode active material is lithium, and the electrolyte is chemically (stable and stable) with respect to the positive electrode active material and lithium.
In addition, it is characterized in that lithium ions are a substance that moves to perform an electrochemical reaction with a living substance.

According to the present invention, the secondary III
k.

The present invention will be explained in detail.

When forming a positive electrode using CuS Shield 01 as the positive electrode active material in the present invention, the positive electrode FiCus VlO
- The powder or a mixture of the powder and a binder powder such as polytetrafluoroethylene is formed into a film-like V-layer in alternating layers on a support such as nickel or stainless steel. j) Ruiha, Cus V
t 016 To impart conductivity to the powder, a solid powder such as acetylene plaque is mixed, and a binder powder such as polytetrafluoroethylene is optionally added, and the mixed scoop is placed in a gold powder container. , or 1...Jn
+2 Mixtures are formed on a support such as nickel, stainless steel, etc. by means of a samurai.

After injury, lithium, which is a material fiber, can be used as a negative electrode by combining it with that of a lithium battery, or by crimping the sheet on a 4flL body made of nickel or stainless steel.
will be accomplished.

Examples of electrolytic materials include aprotic organic materials such as propylene carbonate, 2-methyltetrahydrofuran, dioxolene, tetrahydrofuran, 1,2-dimethoxyethane, ethylene carbonate, r-butyrolactone, dimethyl sulfoxide, acetonitrile, formamide, dimenalformamide, and nitromethane. Solvent and LiCtOn-
LiAtC4゜LiBF,,Lict,LiPF・,L
Known electrolytes generally used in batteries using lithium as a negative electrode active material can be used, such as a combination with a lithium salt such as iAsF. or a solid electrolyte or molten salt using Li as a conductor.

Furthermore, if necessary in view of the battery configuration, a diaphragm made of porous polypropylene or the like may be used.

Next, the present invention will be explained with reference to Examples, but the present invention will be explained in detail with reference to Examples. It does not collect electricity.

In addition, in the examples, battery preparation and measurements were performed under an argon atmosphere.

Example 1 FIG. 1 is a schematic cross-sectional view of a battery cell for measuring the characteristics of a button-type battery, which is a specific example of the battery according to the present invention, in which 1 is a nickel-plated container made of 1Illit@, and 2 is a lithium negative electrode. , 3 is a porous polypropylene septum, 4 is a stainless steel positive electrode container, 5 is a positive electrode mixture, 6a is a 6bid Teflon container, and 7 is a nickel lead wire.

Pressure mold 1 into the concave chamber of container 1 to have a diameter of 20 mm and a thickness of 1 mm.
A lithium negative electrode zt-ax was placed in a container 4 in which a positive electrode mixture 5 was crimped, a diaphragm 3 was placed on the container 4, and the containers 6m and 6b were tightened. The lithium electrode has a disk shape with a diameter of 19 mm. 'd! For the L solution, a solution of IAC104 dehydrated with molecular sieves after distillation and 1 mol/propylene carbonate was used.

The electrolytic solution was used by impregnating the diaphragm 3 and the positive electrode mixture 5. Cus v, OH@ is CuO and Vl Os
were mixed at a molar ratio of 5:1 and heated at 740°C in air.
It was sweetened by heating for 67 hours. This Cu@Vl 01・
and Ketjen Black ECu and polytetrafluoroethylene in a weight ratio of 70:27:3 using a 4' crusher to mix the positive electrode 4! ! It was created. This positive electrode mixture o,<tt, was molded into alternating layers on a titanium mesh spot welded to a square plate, with a diameter of 20 mm1! ! A positive electrode mixture 5 having a thickness of 1 mna was prepared.

When the battery prepared in this way is discharged at a constant current of 1 mA, the discharge curve as shown in Figure 2 is obtained.The discharge capacity density until the voltage drops to 1 V is 406 Ah/- and the energy concealment is 745 Wh/ -It was.

Example 2 A battery prepared in the same manner as in Example 1 was charged and discharged at a constant current of 1 mA. The charge/discharge cycle was 13 hours of discharge, 1 hour of rest, 13 hours of charge, and 1 hour of rest, which corresponds to a charge/discharge depth of 46.4 Ah/Kt (corresponding to one electron participation).

FIG. 3 is a diagram showing the results of a charge/discharge test. That is, the curve shows a discharge state, then a rest period, then a charge state, then one rest period. Curves ASB, C indicate the first, second and iE4 discharges and charges, respectively, the final voltage of the second discharge (track-B) t~2,OV,! The final voltage of the fourth discharge was 1.8V, indicating good charge/discharge characteristics of +1%.

As explained above, the battery of the present invention has the advantage that it can be used in many fields as a small-sized, high-energy-density secondary battery with a large photodischarge capacity.

[Brief explanation of the drawing]

1. Figure 1 is a schematic cross-sectional view of a battery cell for characteristic evaluation of a button-type battery according to an embodiment of the present invention, and Figure 2 shows the relationship between discharge time and voltage of a battery in an embodiment of the present invention. Figure 43
r'll of the present invention:j! FIG. 3 is a diagram showing the number of charging/discharging times and the voltage change during charging/discharging in an example. 1... Container, 2... Lithium negative electrode, 3... Diaphragm,
4... Positive electrode mixture, 5... Positive electrode mixture, 6a, 6b...
・Teflon@g board, 7...Lead woman.

Claims (1)

[Claims] The positive electrode active material is Cus Vt O+. , the negative electrode active material is lithium, and the #1LPsJIR proboscis is the jade electrode l.
chemically stable with respect to paleomaterials and lithium, and
Lithium battery Yuike is characterized by a WJ quality clay in which lithium ions move between the positive electrode active #sada and 'I4c gas chemical vaporization total reaction rounding.