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Gelling agent for alkaline battery and alkaline battery

A gelling agent, alkaline battery technology, applied in the direction of electrolyte immobilization/gelation, gel electrode, battery electrode, etc., can solve the problem of unsatisfactory, and achieve the effect of good drainage

Active Publication Date: 2007-06-13
SANYO CHEM IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the alkaline battery using the gelling agent of the above-mentioned water-absorbing resin has not been able to maintain the long-term discharge performance (discharge capacity and discharge time) and impact resistance, which are the most important performances of alkaline batteries. people must be satisfied

Method used

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  • Gelling agent for alkaline battery and alkaline battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0175] In a 2-liter beaker, 200 g of acrylic acid, 0.6 g (0.3% by weight / acrylic acid) of pentaerythritol triallyl ether (manufactured by DAISO Corporation), and 0.6 g (0.3% by weight / acrylic acid) of trimethylolpropane triacrylate were added. and 800 g of ion-exchanged water were stirred and mixed to prepare an aqueous solution of acrylic acid, and cooled to 8°C.

[0176] The acrylic acid aqueous solution is charged into a 1.5-liter heat-insulated polymerization tank, and nitrogen is introduced into the aqueous solution so that the dissolved oxygen in the acrylic acid aqueous solution is below 0.1 ppm. Add 4.0g0.1% aqueous hydrogen peroxide and 4.0g 0.1% L-ascorbic acid aqueous solution and 1.0g10% 2,2'-azobis(2-amidinopropane)hydrochloride (Wako Pure Chemical Industry Co., Ltd., trade name "V-50") aqueous solution, nitrogen purging in the aqueous solution was continued until the polymerization started. When it was confirmed that the polymerization started and the viscosity ...

Embodiment 2

[0184] In Example 1, except that ethylene glycol diglycidyl ether (manufactured by Nagase Chemical Industry Co., Ltd., trade name "Denacol 810") was used instead of trimethylolpropane triacrylate, the same operation as in Example 1 was carried out, The gelling agent (2) of the present invention was obtained.

Embodiment 3

[0186] In Example 1, except having changed the addition amount of pentaerythritol triallyl ether into 0.2 g (0.1% / acrylic acid), it carried out similarly to Example 1, and obtained the gelling agent (3) of this invention.

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Abstract

A gelling agent for alkaline battery comprising crosslinked polymer (A) whose main constituent monomer unit is methacrylic acid (salt), which gelling agent has a gel (GA) viscosity ratio (N1 / N60) of 0.7 to 1.3 and a content of components soluble in a 37 wt.% aqueous solution of potassium hydroxide of = 30 wt.%; and a relevant alkaline battery. The gel (GA) viscosity ratio (N1 / N60) is determined by homogeneously mixing under agitation 100 pts.wt. of 37 wt.% aqueous solution of potassium hydroxide, 2 pts.wt. of crosslinked polymer (A) and 200 pts.wt. of zinc powder at 40 DEG C to thereby produce gel (GA), measuring the viscosity (40 DEG C, N1) of gel (GA) having been allowed to stand still for one day and the viscosity (40 DEG C, N60) of gel (GA) having been allowed to stand still for 60 days at the same temperature in accordance with JIS K7117-1:1999, and making calculation from the viscosity measurements. Thus, there become available a gelling agent for alkaline battery that exhibits extremely high impact resistance and excels in long-term retention of discharge characteristics and an alkaline battery utilizing the same.

Description

technical field [0001] The present invention relates to a gelling agent for alkaline batteries and alkaline batteries. More specifically, it relates to a gel-form negative electrode alkaline battery gelling agent used for an alkaline battery negative electrode gelling agent mainly composed of an alkaline electrolyte solution and zinc powder, and an alkaline battery using the gelling agent. Background technique [0002] So far, the cathode of alkaline batteries mainly uses a mixture of high-concentration alkaline electrolyte (high-concentration potassium hydroxide aqueous solution, containing zinc oxide, etc. if necessary) and zinc powder and / or zinc alloy powder, in order to prevent alkaline electrolysis Zinc powder and the like in the liquid settle, and water-absorbent resins obtained by insolubilizing poly(meth)acrylic acid and its salts with a crosslinking agent are proposed as gelling agents (Patent Documents 1 to 3). Furthermore, from the aspects of preventing zinc pow...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M6/22H01M4/06H01M4/02
CPCH01M4/381H01M4/244H01M6/22Y02E60/124H01M6/06H01M4/12H01M2300/0085H01M4/42H01M2004/023H01M4/40Y02E60/10H01M4/06H01M4/62
Inventor 大谷和也山口武亮
Owner SANYO CHEM IND LTD
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