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Nickel-metal hydride battery

A nickel-metal hydride battery and electrolyte technology, which is applied to nickel batteries, alkaline batteries, alkaline battery electrodes, etc., can solve problems such as insufficient self-discharge suppression, achieve self-discharge suppression, be beneficial to the environment, and reduce power consumption Effect

Active Publication Date: 2008-10-22
FDK CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, self-discharge cannot be sufficiently suppressed even if the separator of said publication is used in a nickel metal hydride storage battery

Method used

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Embodiment 1

[0038] 1. Fabrication of Negative Plate

[0039] The weighing composition is La 0.10 Ce 0.05 PR 0.35 Nd 0.50 Mg 0.10 Ni 3.70 Al 0.22 The metal raw materials are mixed, and the mixture is melted in a high-frequency melting furnace to obtain an ingot. The ingot was heated in an argon atmosphere at a temperature of 1000°C for 10 hours, so that the crystal structure in the ingot became Ce 2 Ni 7 type structure or similar structure. Afterwards, the ingot is mechanically pulverized and screened in an inactive environment to obtain rare earth Mg—Ni hydrogen storage alloy particles having the above composition. In addition, the average particle size of the obtained rare earth Mg—Ni-based hydrogen storage alloy was 50 μm. The average particle size is a particle size at which the weight integral reaches 50% in the particle size distribution of the rare earth Mg—Ni-based hydrogen storage alloy measured using a laser diffraction / scattering type particle size distribution measuri...

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Abstract

A positive electrode plate (3) of a nickel-metal hydride battery contains nickel hydroxide particles (18), a coating layer (19) covering at least a part of the surface of each nickel hydroxide particle (18) and mainly composed of a cobalt compound having an average valence of cobalt more than 2, and additives (15, 16) respectively containing Nb and Y and distributed among the nickel hydroxide particles (18). A negative electrode plate (4) contains a hydrogen storage alloy having a Co content of not more than 2.0% by mass, and a separator (5) contains a fiber having a sulfone group. An alkaline electrolyte solution contains sodium hydroxide as the main solute.

Description

technical field [0001] The present invention relates to nickel metal hydride accumulator. Background technique [0002] Ni-MH storage batteries are widely used due to their high capacity characteristics. However, nickel-metal hydride batteries tend to reduce the remaining capacity through self-discharge, and when they are used again after a period of time after charging, they need to be recharged. [0003] In order to improve the problems caused by this self-discharge, for example, in the nickel-metal hydride storage battery disclosed in the Japanese Patent Laid-Open No. 62-115657, a non-woven fabric made of sulfonated polyolefin resin is used as a separator . [0004] However, self-discharge cannot be sufficiently suppressed even if the separator of the above-mentioned publication is used in a nickel-metal hydride storage battery. Contents of the invention [0005] An object of the present invention is to provide a nickel-hydrogen storage battery capable of suppressing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/30H01M2/16H01M4/32H01M4/38H01M4/52H01M4/62C22C19/00
CPCH01M4/242H01M2004/027H01M2004/028H01M4/52Y02E60/124H01M2/1606H01M10/345H01M4/383H01M4/362H01M4/32Y02E60/10H01M50/44H01M10/30H01M4/62H01M10/26
Inventor 泉康士前田泰史
Owner FDK CORP
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