JPS5838466A - Negative pole for lithium cell - Google Patents

Abstract

PURPOSE:To improve the charge/dischaege characteristic of the negative pole for Li cell, by bearing Li on a porous Al. CONSTITUTION:Li is employed as the negative active substance while the substance performing the reversible electrochemical reaction with Li ion is employed as the positive pole substance where the electrolytic substance is chemically stable for the positive pole substance and Li while the following negative pole is employed in the Li cell which is the substance where the Li ion is movable. In other word, a porous material Al having the porosity higher than 17/2.54cm bearing Li is employed in this primary and secondary cells as the negative pole. With this negative pole, the drop-out of Li and the occurrence of dendrite can be prevented resulting in the excellent discharge/charge characteristic.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to 8AVi, a lithium battery used in lithium batteries.

14. Using lithium as a negative electrode active material. The song is small and
Although it has been investigated as a battery with high energy levels, its secondary use is a major issue.

Many compounds are being considered as cathode active materials that can be secondaryized. For example, 1i°C compounds (U.S. 'ISt i
``f4th, 089, 052 + Wj #ilya) Oshiru) etc. are opened.

However, compared to the reconnaissance of such secondary electricity 1'lli and stop electrode active products, Senboku regarding the charging and discharging characteristics of Li electrodes is not sufficient, and for the Li secondary 'tun heavy oil development. f51,
The method of manufacturing 8 electrodes with good photodischarge characteristics such as charge/discharge efficiency and cycle life has become a major problem.

Li 111. In an attempt to completely improve the characteristics, it is possible to use Li treated with a gas such as 02.002 for the negative electrode (J, Electrochem, Soc.
, , Vol. 125, pp. 1371-1377] and L
An attempt to use an alloy of i and AI as a negative electrode (J, Electr
ochem, Soc,, Vol.

127. Pages 2100 to 2104] have been reported, but it is not necessarily sufficient, and there is a need for a Li negative electrode ν2 with longer waiting times.

The present invention was made with such a bowl-shaped perspective in mind.
The 1st target is Lithium 11, which is exposed by Houtun and Kotan.
Knowledge that provides the ultimate.

In the present invention, approximately ωL, the negative electrode active material is lithium, the positive electrode material is a material that performs an electrochemical reaction opposite to lithium ions, and ￥lf, j
'〆ti! The material is chemically stable to the positive electrode active material and lithium, and the lithium ions undergo an electrochemical reaction between the positive electrode and the negative electrode. This method is similar to that of the negative electrode used in next-generation batteries, in which lithium is supported on porous aluminum having 17 pores/2.54 cm or more.

When a smooth material such as lithium gold (Al1 &) or lithium flakes is used as a lithium negative electrode, when the discharging or charging current increases, local reactions are accelerated, causing holes to form in the lithium negative electrode. During photovoltage, a phenomenon occurs in which dendrite-like lithium releases 47 and escapes from the negative electrode. This is the cause of decreasing the photodischarge efficiency of LiM cells. So lithium negative 4m reaction table 1h
In order to increase the size of J・a and to facilitate the precipitation of lithium, all 41 holes are filled with a highly electrically conductive material, so that the lithium is mixed with the lithium.'' r
+"+ is possible. From this 4-bo situation, 4H+i p of lithium in porous aluminum'!il:t-
4. Moon 1, which appears at the pole, is in the south.

In this case, if the thickness of the holes in the aluminum is too large, the lithium will not be retained, which will be discussed later. Aluminum is used.Also, LlΣ is used for the previous llΣ smellζ.
There have also been attempts to use A1's I1 firefly (flat plate), and Akira Motouchi's method of adding Ll to porous aluminum has been attempted! !
＋"＋The one who stirred up the mixture is the lithium Kan 4
llSi'Ura 1 [and Tendohui] from boat 4 can produce cows that prevent % live birth, and &J has much better characteristics.

We will examine the effects of this invention using 11 cases that were lost in J'-IT.

The porous aluminum used has a pore size of 17/2.
54 cm ~ 26 pieces/2. ! 54 crn and 8
5 pieces/2.54 cr rn~130 pieces/2.54 cr
n, and both have a thickness of 1nnn.

How to make lithium compatible with these porous 'l'f aluminum i) Contains t, i+ ions? !
i? 2) A method for chemically leveling the lithium gold layer in the bath-tan area; 3) A method for chemically leveling the lithium metal layer in the #+ melt of the lithium metal layer. 4) Method of stacking and pressing lithium flakes 4 and porous aluminum, 5) Lithium gold J
Method of pressing iI4 powder with porous aluminum, 6) Method of depositing lithium on porous aluminum with n-butyllithium, 7) Method of vapor depositing lithium on porous T'L aluminum, Part 4・BIB methods can be considered, but either way it is porous! 1 aluminum carries lithium, 1 rj V i'+ ',! J
1"-, the method is not limited. That is, it works effectively as a lithium negative electrode. In the following actual addition 11, 1.
I, IN LiClO4/propylene carbonate? ti, lithium vapor-chemically precipitated on porous aluminum is used as the negative electrode, but the method of applying lithium to porous aluminum according to this example is just an example. )till Ivt.
-I can't get enough of it.

Example 1 As a counter electrode, a 16 to 20 hr. cm ~ 26 pieces/2
．． Electrodeposited on a 54 cm porous Aluminum plate, and applied P t 4 f II <, and then applied P t 4 f II < , and then applied P t 4 f II < , and then applied P t 4 f II < , and then applied P t 4 f II < , and then applied P t 4 f II < , and then applied P t 4 f II < to 1 cm 2 of aluminum.
'Irr, #, f sum, pt using Li as the pole
By 4J+, which deposits Li on mourning soil, Li-based photoelectric 1
'tf characteristics were determined by 6111. 1st stroke, Noq~ji, I
NLxCiQ4 to propylene carbonate 11:
41'+1 was used.

The measurement is 1s1 mA, /c? Tl 2's constant'tii,
Vat for 1 minute, 49+ Li was released on the Pt top, and the Pt was removed at a constant rate of 111.3it at 1mA/cm2.
The Li extracted from Keyaki'- is converted into Li+ ion hv'
We conducted the Seikul test gorge. Light 1y,” (h,
Efficiency l'K, 1. 't (calculate the potential change of Pt4
Did you stir the Li deposited on ψ to discharge it as Li+ ions? 1. Q: 1-'l and ■) E Nakagami was used to deposit Li gold in the bag.
I used it for fishing.

The photodischarge efficiency and cycle number of the first l f'j, L i Gls are 19:J 'u7N, and
(a) is a Li negative electrode, and the number of holes in this study is 17.
Adding Li to porous aluminum (2.54c)
(b) is a clever example,
l, i % When using a Li square piece -6 = (thickness 0.5 mm) as a pole, the Li mass is 9.
Tun! This shows Jinji. As shown in Figure 1, there are 17 wall holes for the lithium negative electrode, 72.54 cr.
By 9I using lithium JH7!4 on porous aluminum of tt ~ 26 pieces/2.54 cm,
L14 Suno 1-Ryo 11 ('Far performance has clearly improved.

Actual 'h14 Example 2 The number of holes is 85/2.54cm as a lithium negative oxide
~130 pieces/2.54 c 11-+ Porous IC1' The photodischarge characteristics of lithium shell (-) were determined in the same manner as in Pyrolysis 1, except that lithium was supported on aluminum.

Figure wJ3 is a diagram showing the relationship between the photodischarge efficiency of the Li electrode and the Seikle ratio, and (a) il, 4. Invention glue □Number of i holes is 85/2.54cm ~ 130/2.54c+
A piece of porous aluminum containing 1 lithium was prepared. (b) shows the charging/discharging rate in the case where a thin lithium flake (thickness: 0.5 mrn) was used as the negative lithium ion. Second
As can be seen from the figure, the lithium negative electrode was made of porous aluminum with 85 holes/2.54 csn to 130 pores of 4.54 cm. L %;
The charge of 'mountain': 1 ditto every 1 pm - Shiru.

above) 15 years to 1''] gentle Jl)
”Yoreha FI! Confucius monk 17ri / 2.54 cm
Lithium ', x: Jl! 4
'*Let's use tC things V Ko, charge 'II+,
1 (to) 1/kre/(Linium ni next 'eye, etc., etc.).

1st ly, i and als 21Fll f, 2r-
+i'r! ]・''' real #e-Rinauno in IJ, 1〆 former hg 'r+, Tano 12- and cycle 庡's rZJ staff with Ka;-J 1-1 ・(Uru.

１１、i i、、・（入代』゛（・人 I、13
Tadashi Miya Riichi 8-

Claims (1)

[Claims] A negative electrode for a lithium battery, characterized in that lithium is supported on porous aluminum having 17 holes/2.54 cm or more.