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Method for producing electrode for non-water electrolyte battery

A non-aqueous electrolyte and electrode technology, applied in battery electrodes, active material electrodes, electrode manufacturing, etc., can solve problems such as metal corrosion, conductivity deterioration, and battery performance deterioration

Inactive Publication Date: 2004-06-23
JAPAN STORAGE BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, many metals corrode when exposed to water
Therefore, when such a battery is immersed in water, the current collector shows a significant deterioration in the conductivity on its surface
Therefore, such a battery can cause deterioration of the performance of the battery when the performance of the current collector is deteriorated, so it is disadvantageous

Method used

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  • Method for producing electrode for non-water electrolyte battery
  • Method for producing electrode for non-water electrolyte battery
  • Method for producing electrode for non-water electrolyte battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] First, an example in which an aqueous solution of phosphoric acid is used as an aqueous solution of a phosphorus-containing compound for solvent extraction will be described. A nonaqueous electrolyte battery was prepared according to the following procedure.

[0026] A method of preparing a positive electrode is described below. A mixture of 70wt% lithium cobaltate, 6wt% acetylene ink, 9wt% polyvinylidene fluoride (PVdF) and 15wt% n-methylpyrrolidone (NMP) was coated on an aluminum foil with a width of 100 mm, a length of 480 mm and a thickness of 20 μm, It was then dried at a temperature of 150° C. to evaporate the NMP. This procedure was performed on both sides of the aluminum foil in order to prepare a positive electrode having active material layers formed on both sides of the aluminum foil. The positive electrode thus prepared was then subjected to the following treatments to prepare two kinds of positive electrodes (A) and (B).

[0027] A polymer slurry obtained ...

Embodiment 2

[0040] In order to study the effect of the present invention in detail, the positive electrode (I) and the negative electrode (J) of the present invention were prepared. Positive electrode (I) was prepared in the same manner as positive electrode (A) except that the concentration of phosphoric acid in the aqueous solution was changed. Negative electrode (J) was prepared in the same manner as negative electrode (C) except that the concentration of phosphoric acid in the aqueous solution was changed. In addition, comparative positive electrode (K) and negative electrode (L) were prepared in the same manner as positive electrode (I) and negative electrode (J), respectively, except that the electrode coated with polymer slurry was immersed in phosphoric acid-free purified water. The surface resistance of these electrodes was then measured. For measuring the surface resistance, MCP-TESTERLORESTA-FP manufactured by Mitsubishi Petrochemical Co., Ltd. was used. When measuring the su...

Embodiment 3

[0043] The positive and negative electrodes of the present invention were prepared in the same manner as in Example 1 except that various phosphorus compounds were used instead of phosphoric acid. The surface resistance of these electrodes was then measured in the same manner as in Example 2. The results are listed in Table 1.

[0044] Table 1

[0045] Phosphorus compound in water Positive electrode surface resistivity Negative electrode surface resistivity Phosphorus concentration of phosphorus compound (mol / l) Growth amount / KΩ Growth amount / KΩ None (purified water) 0 1.13 0.566 White phosphorus 1×10 -6 0.42 0.23Al(H 2 PO 4 ) 3 1×10 -3 0.132 0.126Ca 3 (PO 4 ) 2 5×10 -6 0.232 0.24Ca(H 2 PO 4 ) 2 1×10 -3 0.132 0.128H 3 PO 4 1×10 -3 0.134 0.126K 2 HPO 4 1×10 -3 0.12 0.13K 3 PO 4 1×10 -3 0.13 0.132KH 2...

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Abstract

In a process for producing an electrode of a nonaqueous electrolyte battery, an electrode and a polymer paste are prepared. The electrode is made of a metal as a current collector and an active material layer thereon. The polymer paste has a polymer dissolved in a solvent soluble in water. The polymer paste is allowed to be held in the electrode. Thereafter, the solvent is extracted from the polymer paste with an aqueous solution containing an alcohol, phosphorous or phosphorous compound.

Description

technical field [0001] The invention relates to a production method of an electrode for a nonaqueous electrolyte battery. Background technique [0002] A battery containing a non-aqueous electrolyte and a negative electrode made of an alkali metal can provide a voltage as high as not less than 3V, so it can form a high-voltage battery, and thus can be used as a high specific energy battery. However, if such a battery is used as a secondary battery, it has a disadvantage in that it is prone to short-circuit due to the deposition of alkali metal on dendrites during charging, thereby reducing the service life. In addition, such a battery can hardly have sufficient reliability due to the high reactivity of alkali metals. In order to overcome these drawbacks of lithium batteries, so-called lithium-ion batteries have been designed, for example, which contain a carbon-based negative electrode made of graphite or carbon instead of metallic lithium and a positive electrode made of l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/02H01M4/04H01M4/139H01M4/1391H01M4/62H01M10/0525H01M10/36
CPCH01M4/04Y10T29/49108H01M4/1391H01M4/0402H01M4/661H01M4/0404H01M4/0416H01M4/623H01M10/0525H01M4/139Y02E60/122Y02E60/10
Inventor 冈田干雄羽隅毅安田秀雄
Owner JAPAN STORAGE BATTERY CO LTD