JP3646634B2 - Lead acid battery - Google Patents
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- JP3646634B2 JP3646634B2 JP2000255176A JP2000255176A JP3646634B2 JP 3646634 B2 JP3646634 B2 JP 3646634B2 JP 2000255176 A JP2000255176 A JP 2000255176A JP 2000255176 A JP2000255176 A JP 2000255176A JP 3646634 B2 JP3646634 B2 JP 3646634B2
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- electrode plate
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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Description
【０００１】
【発明の属する技術分野】
本発明は、鉛蓄電池の長寿命化に関するものである。
【０００２】
【従来の技術】
鉛蓄電池は、コスト及び信頼性の面で優れていることから、無停電電源装置、自動車用バッテリー、電気自動車等の幅広い分野で使用されている。最近、これらに用いられる鉛蓄電池の長寿命化が強く望まれている。
【０００３】
鉛蓄電池を長寿命化するには、負極板に用いられている活物質を微細化したり多孔質化したりすることによって、負極板の電極反応面積を大きくし、その状態を長期間にわたって保持する必要がある。
【０００４】
なお、負極活物質を微細化したり多孔質化する材料（以下、エキスパンダと呼ぶ）として、負極活物質層に添加剤としてリグニンを含有させたり、負極板と接触するセパレータの部分にリグニンを含浸させる手法が有効であることが知られている。
【０００５】
【発明が解決しようとする課題】
しかしながら、上述した負極板の活物質層に添加したリグニンや、負極板と接触するセパレータに含浸させたリグニンは、鉛蓄電池の使用時間の経過とともに希硫酸電解液中に溶出し、その溶出したリグニンが正極板で分解されて消失する。
【０００６】
したがって、負極板の活物質層やセパレータに添加したリグニンの量が次第に減少してエキスパンダとしての効果が少なくなり、その結果、鉛蓄電池の放電容量が低下することが知られている。本発明は上記した事案に鑑み、長寿命な鉛蓄電池を提供することを課題とする。
【０００７】
【課題を解決するための手段】
上記の課題を解決するために本発明では、フェノール誘導体が添加された木粉等のリグノセルロース系物質を負極板の活物質層、又は、負極板及び負極板と接触するセパレータ中に含有させることを特徴としている。
【０００８】
すなわち、第一の発明は、正極板と負極板とをセパレータを介して積層した鉛蓄電池であって、前記負極板、又は、前記負極板及びセパレータに、リグノセルロースにフェノール誘導体を含浸させた物質を存在させることを特徴とし、第二の発明は、正極板と負極板とをセパレータを介して積層した鉛蓄電池であって、前記負極板、又は、前記負極板及びセパレータに、リグノセルロースにフェノール誘導体を含浸させた物質及びリグニンを存在させることを特徴とし、第三の発明は、前記リグノセルロースとして、木粉を用いることを特徴としている。
【０００９】
第四の発明は、前記フェノール誘導体は、メトキシ基を有することを特徴とし、第五の発明は、前記メトキシ基を有するフェノール誘導体が、２−メトキシフェノール、又は、２、６−ジメトキシフェノールであることを特徴としている。
【００１０】
第六の発明は、前記フェノール誘導体として、ポリフェノール類を用いることを特徴としている。
【００１１】
【発明の実施の形態】
以下に、本発明の実施の形態について説明する。
【００１２】
１．フェノール誘導体を含有した木粉の作製
リグノセルロースの粉末として、広葉樹であるナラの木粉を使用した。なお、前記木粉の平均粒子径は、約０．５ｍｍである。
【００１３】
フェノール誘導体として、（１）パラ−クレゾール、（２）カテコール、（３）２−メトキシフェノール、（４）２，６−ジメトキシフェノール、又は（５）２，６−ジメトキシフェノールと２，６−ジメチルフェノールを１：１の質量比で混合した混合物を用いた。
【００１４】
フェノール誘導体が液状のパラ−クレゾールの場合には、前記木粉１ｇ当たりにフェノール誘導体を１０ｍｌ加えて、木粉の内部にフェノール誘導体を含浸させて用いた。
【００１５】
一方、２−メトキシフェノールなどのフェノール誘導体が個体の場合は、１ｇの前記各フェノール誘導体を１０ｍｌのジエチルエーテルなどの溶媒に溶解させて溶液とし、前記木粉１ｇ当たりに前記溶液を５ｍｌ加えて、木粉の内部にフェノール誘導体を含浸させ、その後、乾燥させて溶媒を除去した。
【００１６】
２．リグニン
従来から使用している市販のリグニン粉末（商品名：INDULIN、Westvaco社製）を用いた。このリグニン粉末は、木材を破砕したチップを、アルカリ蒸解法（クラフト蒸解法とも呼ばれている）によって生成したものである。
【００１７】
３．負極板
酸化鉛（ＰｂＯ）を主成分とする鉛粉１００質量部に、硫酸バリウムを２質量部と、上述した各種フェノール誘導体を含浸させた各種木粉、リグニン粉末、又は、前記各種フェノール誘導体を含浸させた木粉と前記リグニン粉末とを添加して混合して混合物を作製する。そして、前記混合物中の鉛粉１００質量部に対して比重１．２６の希硫酸１０質量部と、水７質量部とを加えて練合し、負極用のペースト状活物質を作製した。
【００１８】
このペースト状活物質を、l６９ｍｍ×w４４ｍｍ×t２．４ｍｍの鉛−カルシウム−錫合金からなる集電体格子に充填して、温度４５°Ｃ、湿度９８ＲＨ％の雰囲気下で２４時間熟成させ、６０°Ｃの雰囲気温度で１６時間乾燥させて未化板とした。この未化板を、比重１．０５０の希硫酸中で２４時間化成して負極板とした。
【００１９】
４．正極板
正極板として、従来から使用しているものを用いた。すなわち、酸化鉛（ＰｂＯ）を主成分とする鉛粉１００質量部に対して比重１．３４の希硫酸１２質量部と、水１５質量部とを加えて練合し、正極用のペースト状活物質を作製した。
【００２０】
このペースト状活物質を、l６９ｍｍ×w４４ｍｍ×t３．７ｍｍの鉛−カルシウム−錫合金からなる集電体格子に充填して、温度４５°Ｃ、湿度９８ＲＨ％の雰囲気下で２４時間熟成させ、６０°Ｃの雰囲気温度で１６時間乾燥させて未化板とした。この未化板を、比重１．０５０の希硫酸中で２４時間化成して正極板とした。
【００２１】
５．セパレータ
以下の実施例及び比較例に使用したセパレータはガラス繊維製のリテーナで、従来から使用しているガラス繊維と、バインダ繊維等とを、適量の水に分散させた後に、抄紙した後、加熱・乾燥させて作成したものである。
【００２２】
後述する実施例では、２種類のセパレータを用いた。すなわち、一方のセパレータは従来から使用していたガラス繊維を主成分とする厚みが１．５ｍｍのセパレータである。
【００２３】
一方、他方のセパレータは、前記抄紙時に、ガラス繊維とバインダ繊維等に、上記したパラ−クレゾールを含浸させた木粉を、ガラス繊維質量と同質量添加して作製した厚みが１．５ｍｍのセパレータである。
【００２４】
６．電池の製造・試験
上記した負極板４枚と正極板３枚とを、前記セパレータを介して積層・溶接して極板群を組み立て、該極板群をＡＢＳ製の電槽に組込んで蓋をつけ、電槽内に比重が１．３１（２０°Ｃ）の希硫酸電解液を５６ｍｌ注液した後、密閉して７Ａｈ−２Ｖの小形制御弁式鉛蓄電池を作製した。
【００２５】
初期の制御弁式鉛蓄電池の放電容量は、２５℃中で、２１Ａ(３ＣＡ)の電流値で放電して測定した。そして、制御弁式鉛蓄電池の寿命は、加速試験として６０℃の温度雰囲気中で２．２７５Ｖ/セルの定電圧で連続過充電を行い、定期的に２５℃まで冷却した後、２１Ａ(３ＣＡ)の電流値で放電して放電容量を測定して、初期の放電容量と比較した。
【００２６】
【実施例】
以下に本発明の実施例について説明する。
【００２７】
（実施例１）
酸化鉛（ＰｂＯ）を主成分とする鉛粉１００重量部に、エキスパンダとしてパラ-クレゾールを含浸させた木粉を０．９質量部添加して作製した負極板を用い、セパレータとして従来品を用いた。その他の小形制御弁式鉛蓄電池の作製条件や試験条件は上記したものである。
【００２８】
（実施例２）
酸化鉛（ＰｂＯ）を主成分とする鉛粉１００重量部に、エキスパンダとしてカテコールを含浸させた木粉を０．９質量部添加して作製した負極板を用い、セパレータとして従来品を用いた。その他の小形制御弁式鉛蓄電池の作製条件や試験条件は上記したものである。
【００２９】
（実施例３）
酸化鉛（ＰｂＯ）を主成分とする鉛粉１００重量部に、エキスパンダとして２−メトキシフェノールを含浸させた木粉を０．９質量部添加して作製した負極板を用い、セパレータとして従来品を用いた。その他の小形制御弁式鉛蓄電池の作製条件や試験条件は上記したものである。
【００３０】
（実施例４）
酸化鉛（ＰｂＯ）を主成分とする鉛粉１００重量部に、エキスパンダとして２，６−ジメトキシフェノールを含浸させた木粉を０．９質量部添加して作製した負極板を用い、セパレータとして従来品を用いた。その他の小形制御弁式鉛蓄電池の作製条件や試験条件は上記したものである。
【００３１】
（実施例５）
酸化鉛（ＰｂＯ）を主成分とする鉛粉１００重量部に、エキスパンダとして２，６−ジメトキシフェノールと２，６−ジメチルフェノールを１：１の質量比で含浸させた木粉を０．９質量部添加して作製した負極板を用い、セパレータとして従来品を用いた。その他の小形制御弁式鉛蓄電池の作製条件や試験条件は上記したものである。
【００３２】
（実施例６）
酸化鉛（ＰｂＯ）を主成分とする鉛粉１００重量部に、エキスパンダとしてパラ-クレゾールを含浸させた木粉を０．４５質量部及び上記した市販のリグニン粉末を０．１質量部添加して作製した負極板を用い、セパレータとして従来品を用いた。その他の小形制御弁式鉛蓄電池の作製条件や試験条件は上記したものである。
【００３３】
（実施例７）
酸化鉛（ＰｂＯ）を主成分とする鉛粉１００重量部に、エキスパンダとしてパラ-クレゾールを含浸させた木粉を０．９質量部添加して作製した負極板を用い、セパレータとしてパラ−クレゾールを含有したものを用いた。その他の小形制御弁式鉛蓄電池の作製条件や試験条件は上記したものである。
【００３４】
（比較例）
酸化鉛（ＰｂＯ）を主成分とする鉛粉１００重量部に、エキスパンダとして上記した市販のリグニン粉末を０．２質量部添加して作製した負極板を用い、セパレータとして従来品を用いた。なお、この負極板仕様は従来から使用していたものである。その他の小形制御弁式鉛蓄電池の作製条件や試験条件は上記したものである。
【００３５】
表１に、初期の放電時間に対する、６０℃での加速試験後における放電容量の比率を示す。表１に示すように、本発明を用いた実施例１〜７の電池は、比較例１の電池より長寿命であることが分かる。
【００３６】
なお、負極板にパラ-クレゾールを含浸させた木粉とリグニン粉末を含有する実施例６は、３ヶ月後及び７ヶ月後の放電容量比率が高く、より好ましいことがわかる。また、負極板とセパレータの両方に本発明を用いた実施例７は７ヶ月後の放電容量比率が高く、好ましい特性を示すことが分かる。
【００３７】
これらの理由として、小形制御弁式鉛蓄電池の内部において、電解液として用いている希硫酸電解液と、前記フェノール誘導体が添加された木粉とが反応し、前記フェノール誘導体が添加された木粉からリグニンが少しずつ抽出され、該リグニンが負極板においてエキスパンダとして用いられているためと考えられる。
【００３８】
また、表１に示すように理由は不明であるが、実施例１〜５の電池のうちでも、フェノール誘導体にメトキシ基を有するもの（実施例３）や、２個以上のメトキシ基やフェノール基を有するもの（実施例４，５）が寿命特性の点で好ましいことが分かる。
【００３９】
【表１】
上述した実施例では、小形制御弁式鉛蓄電池に使用した場合について例示したが、本発明は鉛蓄電池の用途や形状等に限定されることなく、上述した特許請求の範囲において用いることができる。また、リグノセルロースとしては、上記した広葉樹を用いた木粉以外に、針葉樹や草本類を用いた場合でも同様の結果が得られた。
【００４１】
【発明の効果】
上述したように、本発明を用いることにより、鉛蓄電池を長寿命化することができ優れたものである。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to extending the life of lead-acid batteries.
[0002]
[Prior art]
Lead storage batteries are excellent in terms of cost and reliability, and are used in a wide range of fields such as uninterruptible power supplies, automobile batteries, and electric vehicles. Recently, it has been strongly desired to extend the life of lead-acid batteries used in these.
[0003]
In order to extend the life of lead-acid batteries, it is necessary to increase the electrode reaction area of the negative electrode plate by keeping the active material used in the negative electrode plate finer or porous so that the state can be maintained over a long period of time. There is.
[0004]
In addition, as a material for making the negative electrode active material fine or porous (hereinafter referred to as an expander), the negative electrode active material layer contains lignin as an additive, or the portion of the separator in contact with the negative electrode plate is impregnated with lignin. It is known that the technique to make is effective.
[0005]
[Problems to be solved by the invention]
However, the lignin added to the active material layer of the negative electrode plate described above and the lignin impregnated in the separator in contact with the negative electrode plate are eluted in the dilute sulfuric acid electrolyte with the passage of the use time of the lead storage battery, Is dissolved by the positive electrode plate and disappears.
[0006]
Therefore, it is known that the amount of lignin added to the active material layer of the negative electrode plate and the separator is gradually reduced to reduce the effect as an expander, and as a result, the discharge capacity of the lead storage battery is reduced. This invention makes it a subject to provide a long life lead acid battery in view of the above-mentioned case.
[0007]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, in the present invention, a lignocellulosic material such as wood flour to which a phenol derivative is added is contained in the active material layer of the negative electrode plate, or the separator in contact with the negative electrode plate and the negative electrode plate. It is characterized by.
[0008]
That is, the first invention is a lead storage battery in which a positive electrode plate and a negative electrode plate are laminated via a separator, wherein the negative electrode plate or the material obtained by impregnating a phenol derivative into lignocellulose in the negative electrode plate and the separator. The second invention is a lead-acid battery in which a positive electrode plate and a negative electrode plate are laminated via a separator, wherein the negative electrode plate or the negative electrode plate and the separator are mixed with phenol in lignocellulose. The substance impregnated with the derivative and lignin are present, and the third invention is characterized by using wood flour as the lignocellulose.
[0009]
The fourth invention is characterized in that the phenol derivative has a methoxy group, and the fifth invention is that the phenol derivative having the methoxy group is 2-methoxyphenol or 2,6-dimethoxyphenol. It is characterized by that.
[0010]
The sixth invention is characterized in that polyphenols are used as the phenol derivative.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below.
[0012]
1. Production of Wood Powder Containing Phenol Derivative As a lignocellulose powder, oak wood powder, which is a hardwood, was used. The wood powder has an average particle diameter of about 0.5 mm.
[0013]
Phenol derivatives include (1) para-cresol, (2) catechol, (3) 2-methoxyphenol, (4) 2,6-dimethoxyphenol, or (5) 2,6-dimethoxyphenol and 2,6-dimethyl. A mixture in which phenol was mixed at a mass ratio of 1: 1 was used.
[0014]
When the phenol derivative was liquid para-cresol, 10 ml of the phenol derivative was added per 1 g of the wood flour, and the wood derivative was impregnated with the phenol derivative.
[0015]
On the other hand, when a phenol derivative such as 2-methoxyphenol is an individual, 1 g of each phenol derivative is dissolved in a solvent such as 10 ml of diethyl ether to form a solution, and 5 ml of the solution is added per 1 g of the wood flour. The wood powder was impregnated with a phenol derivative and then dried to remove the solvent.
[0016]
2. Lignin A commercially available lignin powder (trade name: INDULIN, manufactured by Westvaco) used in the past was used. This lignin powder is produced by crushing wood by an alkali cooking method (also called a kraft cooking method).
[0017]
3. Various wood powders, lignin powders or various phenol derivatives impregnated with 2 parts by weight of barium sulfate and 100 parts by weight of lead powder mainly composed of negative electrode lead oxide (PbO) and the above-mentioned various phenol derivatives. The impregnated wood powder and the lignin powder are added and mixed to prepare a mixture. Then, 10 parts by mass of diluted sulfuric acid having a specific gravity of 1.26 and 7 parts by mass of water were added to 100 parts by mass of the lead powder in the mixture and kneaded to prepare a paste-like active material for a negative electrode.
[0018]
The paste active material, l 69mm × w 44mm × t 2.4mm of lead - calcium - was filled in a collector Taikakuko consisting of tin alloy, the temperature 45 ° C, 24 hours aging under an atmosphere of humidity of 98 RH% And dried at an ambient temperature of 60 ° C. for 16 hours to obtain an unformed plate. This unformed plate was formed in dilute sulfuric acid having a specific gravity of 1.050 for 24 hours to obtain a negative electrode plate.
[0019]
4). The positive electrode plate used heretofore has been used. That is, 12 parts by mass of dilute sulfuric acid having a specific gravity of 1.34 and 15 parts by mass of water are added to 100 parts by mass of lead powder mainly composed of lead oxide (PbO) and kneaded to obtain a paste-like active material for the positive electrode. The material was made.
[0020]
This pasty active material was filled in a current collector grid made of lead-calcium-tin alloy of l 69 mm × w 44 mm × t 3.7 mm and aged for 24 hours in an atmosphere of temperature 45 ° C. and humidity 98 RH%. And dried at an ambient temperature of 60 ° C. for 16 hours to obtain an unformed plate. This unformed plate was formed in dilute sulfuric acid having a specific gravity of 1.050 for 24 hours to obtain a positive electrode plate.
[0021]
5. Separator The separator used in the following examples and comparative examples is a glass fiber retainer, and after conventionally dispersing the glass fiber, binder fiber, etc. in an appropriate amount of water, paper making, heating・ It was made by drying.
[0022]
In the examples described later, two types of separators were used. That is, one separator is a separator having a thickness of 1.5 mm mainly composed of glass fiber that has been conventionally used.
[0023]
On the other hand, the other separator is a separator having a thickness of 1.5 mm, which is produced by adding the same mass as the glass fiber mass to the above-described para-cresol impregnated into glass fiber and binder fiber during the paper making. It is.
[0024]
6). Battery production and test The above-described four negative plates and three positive plates are laminated and welded via the separator to assemble an electrode plate group, and the electrode plate group is assembled in an ABS battery case and covered. And 56 ml of a dilute sulfuric acid electrolyte solution having a specific gravity of 1.31 (20 ° C.) was poured into the battery case and sealed to produce a 7Ah-2V small control valve type lead acid battery.
[0025]
The discharge capacity of the initial control valve type lead storage battery was measured by discharging at 25 ° C. with a current value of 21 A (3 CA). The life of the control valve type lead-acid battery is 21A (3CA) after performing continuous overcharge at a constant voltage of 2.275V / cell in a 60 ° C temperature atmosphere as an accelerated test and periodically cooling to 25 ° C. The discharge capacity was measured by discharging at a current value of and compared with the initial discharge capacity.
[0026]
【Example】
Examples of the present invention will be described below.
[0027]
(Example 1)
A negative electrode plate prepared by adding 0.9 parts by mass of wood powder impregnated with para-cresol as an expander to 100 parts by weight of lead powder containing lead oxide (PbO) as a main component is used as a separator. Using. The production conditions and test conditions of other small control valve type lead-acid batteries are as described above.
[0028]
(Example 2)
A negative electrode plate prepared by adding 0.9 parts by weight of wood powder impregnated with catechol as an expander to 100 parts by weight of lead powder mainly composed of lead oxide (PbO), and a conventional product as a separator was used. . The production conditions and test conditions of other small control valve type lead-acid batteries are as described above.
[0029]
(Example 3)
Conventional separator as a separator using a negative electrode plate prepared by adding 0.9 parts by weight of wood powder impregnated with 2-methoxyphenol as an expander to 100 parts by weight of lead powder mainly composed of lead oxide (PbO) Was used. The production conditions and test conditions of other small control valve type lead-acid batteries are as described above.
[0030]
(Example 4)
As a separator using a negative electrode plate prepared by adding 0.9 parts by mass of wood powder impregnated with 2,6-dimethoxyphenol as an expander to 100 parts by weight of lead powder mainly composed of lead oxide (PbO) A conventional product was used. The production conditions and test conditions of other small control valve type lead-acid batteries are as described above.
[0031]
(Example 5)
A wood powder obtained by impregnating 100 parts by weight of lead powder mainly composed of lead oxide (PbO) with 2,6-dimethoxyphenol and 2,6-dimethylphenol as an expander at a mass ratio of 1: 1 is 0.9. A negative electrode plate prepared by adding part by mass was used, and a conventional product was used as a separator. The production conditions and test conditions of other small control valve type lead-acid batteries are as described above.
[0032]
(Example 6)
To 100 parts by weight of lead powder containing lead oxide (PbO) as a main component, 0.45 parts by weight of wood powder impregnated with para-cresol as an expander and 0.1 parts by weight of the above-mentioned commercially available lignin powder are added. The conventional negative electrode plate was used as a separator. The production conditions and test conditions of other small control valve type lead-acid batteries are as described above.
[0033]
(Example 7)
A negative electrode plate prepared by adding 0.9 parts by weight of wood powder impregnated with para-cresol as an expander to 100 parts by weight of lead powder containing lead oxide (PbO) as a main component, and using para-cresol as a separator The one containing was used. The production conditions and test conditions of other small control valve type lead-acid batteries are as described above.
[0034]
(Comparative example)
A negative electrode plate prepared by adding 0.2 parts by mass of the above-described commercially available lignin powder as an expander to 100 parts by weight of lead powder mainly composed of lead oxide (PbO) was used as a separator, and a conventional product was used. This negative electrode plate specification has been used conventionally. The production conditions and test conditions of other small control valve type lead-acid batteries are as described above.
[0035]
Table 1 shows the ratio of the discharge capacity after the acceleration test at 60 ° C. with respect to the initial discharge time. As shown in Table 1, it can be seen that the batteries of Examples 1 to 7 using the present invention have a longer life than the battery of Comparative Example 1.
[0036]
In addition, it turns out that Example 6 containing the wood powder which impregnated the negative electrode plate with para-cresol and the lignin powder has a high discharge capacity ratio after 3 months and after 7 months, and is more preferable. In addition, it can be seen that Example 7 using the present invention for both the negative electrode plate and the separator has a high discharge capacity ratio after 7 months and exhibits favorable characteristics.
[0037]
The reason for this is that, inside the small control valve type lead-acid battery, the dilute sulfuric acid electrolyte used as the electrolyte reacts with the wood powder to which the phenol derivative is added, and the wood powder to which the phenol derivative is added. This is considered to be because lignin was extracted little by little and the lignin was used as an expander in the negative electrode plate.
[0038]
Moreover, although the reason is unknown as shown in Table 1, among the batteries of Examples 1 to 5, those having a methoxy group in the phenol derivative (Example 3), two or more methoxy groups and phenol groups (Examples 4 and 5) having the above are preferable in terms of life characteristics.
[0039]
[Table 1]
In the above-described embodiment, the case where the lead-acid battery is used for a small control valve type is illustrated, but the present invention is not limited to the use and shape of the lead-acid battery, and can be used in the scope of the above-mentioned claims. Moreover, as lignocellulose, the same result was obtained even when conifers and herbs were used in addition to the above-mentioned wood flour using hardwood.
[0041]
【The invention's effect】
As described above, by using the present invention, the life of the lead-acid battery can be extended, which is excellent.
Claims (6)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000255176A JP3646634B2 (en) | 2000-08-25 | 2000-08-25 | Lead acid battery |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000255176A JP3646634B2 (en) | 2000-08-25 | 2000-08-25 | Lead acid battery |
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| Publication Number | Publication Date |
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| JP2002075432A JP2002075432A (en) | 2002-03-15 |
| JP3646634B2 true JP3646634B2 (en) | 2005-05-11 |
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| JP2000255176A Expired - Fee Related JP3646634B2 (en) | 2000-08-25 | 2000-08-25 | Lead acid battery |
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| JP (1) | JP3646634B2 (en) |
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