Thickener for alkaline battery and alkaline battery

A technology of alkaline batteries and thickeners, applied in the direction of alkaline storage battery electrodes, alkaline storage batteries, battery electrodes, etc., can solve the problems of battery impact resistance and other problems of filling amount deviation

Active Publication Date: 2007-08-08
SANYO CHEM IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, in terms of the most important properties of the battery, that is, maintaining long-term discharge properties (discharge capacity and discharge time), when filling the battery with an electrolyte solution containing a thickener, the filling amount varies, and the impact resistance of the battery, etc. , does not necessarily meet the requirements

Method used

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  • Thickener for alkaline battery and alkaline battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0149] 200 g of acrylic acid, 0.6 g of trimethylolpropane triacrylate (0.3% by weight / acrylic acid) and 800 g of ion-exchanged water were added to a 2 L beaker, stirred and mixed to prepare an aqueous acrylic acid solution, and cooled to 8°C.

[0150] Put an acrylic acid aqueous solution in a 1.5L heat-insulated polymerization tank, and pass nitrogen into the aqueous solution so that the dissolved oxygen in the acrylic acid aqueous solution is 0.1 ppm or less. Add 4.0 g of 0.1% hydrogen peroxide water, 4.0 g of 0.1% L-ascorbic acid aqueous solution and 1.0 g of 10% 2,2'-azobis(2-amidinopropane ) hydrogen chloride (manufactured by Wako Pure Chemical Industries, Ltd., trade name: "V-50") aqueous solution, and nitrogen purge into the aqueous solution was continued until polymerization started. When it was confirmed that the polymerization started and the viscosity of the acrylic acid aqueous solution started to rise, the nitrogen purge was stopped, and the polymerization was carr...

Embodiment 2

[0159] Except in Example 1, a crosslinked polymer (A2 ) except that the thickener (2) of the present invention was obtained in the same manner as in Example 1.

Embodiment 3

[0161] Except that in Example 1, the mixing ratio (weight ratio) of the crosslinked polymer (A1) and the crosslinked polymer (B1) was set to 1:2, the same operation as in Example 1 was carried out to obtain the augmented polymer of the present invention. thickener (3).

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Abstract

A thickener for use in an alkaline battery provides a gel viscosity ratio (N1h/N12h) of 0.7 to 1.3, the gel viscosity ratio (N1h/N12h) being a ratio of a viscosity (N1h) of a gel after being left to stand for one hour to a viscosity (N12h) of the gel after being left to stand for twelve hours (where the gel viscosity is a viscosity of a gel composed of 2.0 parts by weight of the thickener, 200 parts by weight of zinc powder, and 100 parts by weight of 37 wt% aqueous solution of potassium hydroxide, measured at 40 DEG C according to JIS K7117-1: 1999). An alkaline battery having a negative electrode gel in which the thickener of the present invention is used is provided. The alkaline battery exhibits improved long-term retention of discharge characteristics (discharge amount and discharge time), and improved impact resistance.

Description

technical field [0001] The invention relates to a thickener for alkaline batteries and alkaline batteries. In more detail, the present invention relates to a gel-like thickener for negative electrode alkaline batteries used in a thickener for negative electrodes of alkaline batteries mainly composed of alkaline electrolyte and zinc powder, and the use of the thickener alkaline batteries. Background technique [0002] So far, the negative electrode of alkaline battery mainly uses the mixture of high-concentration alkaline electrolyte (contains high-concentration potassium hydroxide aqueous solution, also contains zinc oxide etc. as required) and zinc powder and / or zinc alloy powder etc., in order to To prevent the deposition of zinc powder in the alkaline electrolyte, increase the contact frequency of zinc, and propose the use of cross-linked branched poly(meth)acrylic acid and its salts, carboxyvinyl polymers, carboxymethyl Base cellulose and its salts, etc. are used as th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M6/06H01M4/06
CPCH01M6/08H01M2300/0014H01M4/622H01M4/621H01M4/02H01M4/62H01M4/26H01M10/30H01M10/24H01M10/345Y02E60/124H01M4/244H01M6/22H01M2300/0085H01M6/06Y02E60/10C08L33/02C08L63/00
Inventor 大谷和也山口武亮
Owner SANYO CHEM IND LTD
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