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Nickel hydrogen secondary battery

A secondary battery, nickel metal hydride technology, applied in the direction of secondary batteries, nickel storage batteries, battery electrodes, etc., can solve the problem of battery capacity reduction and other issues

Active Publication Date: 2004-06-16
FDK CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is, in the case of continuous charging, the battery capacity decreases

Method used

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  • Nickel hydrogen secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] 1. Fabrication of positive electrode

[0055] A mixed aqueous solution of nickel sulfate, zinc sulfate, and cobalt sulfate was prepared at a ratio of 3% by mass of Zn and 1% by mass of Co in terms of amounts relative to Ni. To this mixed aqueous solution, an aqueous sodium hydroxide solution was slowly added with stirring and allowed to react. At this time, the pH of the mixed aqueous solution during the reaction was maintained at 13 to 14, and approximately spherical nickel hydroxide particles were precipitated in the mixed aqueous solution. Then, the nickel hydroxide particles were washed three times with 10 times the amount of pure water, and then dehydrated and dried to obtain a powder of nickel hydroxide particles.

[0056] Then, this powder, equivalent to 5% by mass of diyttrium trioxide (Y 2 o 3 ) powder, the HPC (hydroxypropyl cellulose) dispersion liquid (dispersant: water 40 mass parts, solid content 60 mass parts) that are equivalent to 40 mass % mix, make...

Embodiment 2～11

[0066] When making the positive electrode, replace Y 2 o 3 powder, adding equivalent to 5% by mass of Nb 2 o 5 , Yb 2 o 3 、Er 2 o 3 , Ca(OH) 2 , SrO, Ba(OH) 2 、TiO 2 、WO 3 、MoO 3 or Ta 2 o 5 For the formed powder, an AA-size nickel-hydrogen secondary battery having a nominal capacity of 1200 mAh was produced in the same manner as in Example 1 except that the value of x in the hydrogen storage alloy was changed as shown in Table 1.

Embodiment 12

[0068] When making the positive electrode, except that instead of the powder formed by nickel hydroxide particles, the powder of composite particles in which the surface of the nickel hydroxide particles is covered by a coating layer formed by cobalt hydroxide is used, the others are the same as in Example 1, and a AA size nickel metal hydride secondary battery with a nominal capacity of 1200mAh.

[0069] That is, when producing a positive electrode, nickel hydroxide particles are precipitated in a mixed aqueous solution, and then an aqueous cobalt sulfate solution is added thereto and allowed to react. Here, the pH of the mixed aqueous solution during the reaction was kept at 9 to 10, and cobalt hydroxide was deposited on the surface of the previously deposited approximately spherical nickel hydroxide particles. Then, the approximately spherical nickel hydroxide particles whose surface is covered with cobalt hydroxide are washed 3 times with 10 times the amount of pure water,...

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Abstract

A nickel-hydrogen secondary battery comprises a positive electrode (10) and a negative electrode (12) opposite each other with a separator (18) between, and contained in a container (14) with an alkaline electrolyte. The positive electrode (10) contains nickel hydroxide and at least one element selected from a group consisting of Y, Yb, Er, Ca, Sr, Ba, Nb, Ti, W, Mo and Ta. The negative electrode (12) contains a hydrogen-absorbing alloy having composition represented by a general formula Ln1-xMgx(Ni1-yTy)s, where Ln is at least one element selected from a group consisting of the lanthanoids, Ca, Sr, Sc, Y, Ti, Zr and Hf, T is at least one element selected from a group consisting of V, Nb, Ta, Cr, Mo, Mn, Fe, Co, Al, Ga, Zn, Sn, In, Cu, Si, P and B, and x, y and z are numerical values satisfying the requirements 0 H01M 10 / 30 H01M 4 / 32 H01M 4 / 38 H01M 4 / 52 1 15 1 2003 / 11 / 27 1505197 2004 / 6 / 16 1237648 2006 / 1 / 18 2006 / 1 / 18 2006 / 1 / 18 Sanyo Electric Co., Ltd. Japan Kibara Suguri wang huimin 11021 The Patent Agency of the Chinese Academy of Sciences Inside the Chinese Academy of Sciences, No.52 Sanlihe Road, Fuwai, Beijing 100864 Japan 2002 / 11 / 28 2002-345997

Description

technical field [0001] The invention relates to a nickel-hydrogen secondary battery. Background technique [0002] A nickel-metal hydride secondary battery has a positive electrode containing nickel hydroxide as an active material. Although the positive electrode has a high energy density in a room temperature atmosphere such as 20°C, the energy density decreases in a high temperature atmosphere. This is because the oxygen generation potential of the positive electrode decreases in a high-temperature atmosphere. That is, when the battery is charged in a high-temperature atmosphere, nickel hydroxide undergoes a conversion reaction to nickel hydroxide and reacts with oxygen, so that nickel hydroxide cannot be fully charged, and as a result, the active material utilization rate is reduced. [0003] Therefore, a positive electrode in which a specific additive is added in addition to nickel hydroxide has been proposed as a positive electrode capable of suppressing such an oxyg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C19/00C01B3/00C22C19/03H01M4/24H01M4/32H01M4/36H01M4/38H01M4/52H01M4/62H01M10/30H01M10/34
CPCH01M4/32C22C19/03H01M4/52Y02E60/327H01M4/366Y02E60/124H01M10/345H01M4/383C01B3/0057Y02E60/32Y02E60/10
Inventor 木原胜
Owner FDK CORP
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