Chemistry: electrical current producing apparatus – product – and – Current producing cell – elements – subcombinations and... – Electrode
Patent
1997-12-23
2000-06-13
Nuzzolillo, Maria
Chemistry: electrical current producing apparatus, product, and
Current producing cell, elements, subcombinations and...
Electrode
429227, H01M 460
Patent
active
06074782&
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a lead storage battery using a negative electrode active substance that contains an added negative electrode additive.
PRIOR ART
A lead storage battery is generally formed of a positive electrode, a negative electrode and electrolyte. Conventionally the negative electrode of the above-formed lead storage battery uses the negative electrode active substance that contains the negative electrode additive that has been added thereto. The substance called lignin is used as the negative electrode additive.
The lignin has provided advantages such as inhibiting the negative electrode from decreasing its surface area or shrinking, keeping charging/discharging reactivity and further prolonging the cycle life of the lead storage battery.
The lignin serves to supply a Pb.sup.2+ ion during charging/discharging so that the discharging performance of the lead storage battery is enhanced especially at a low temperature.
However as the lignin is characterized to be decomposed in the process of repetitive charging/discharging of the lead storage battery, the organic substance generated by the decomposition may elute into the electrolyte. In such a case, the excessive voltage of the lead storage battery is raised, resulting in degraded charging performance (GS-News, Vol. 37, No. 1, pp.22-28, 1978).
In order to solve the aforementioned problem, the present invention provides the lead storage battery having a prolonged cycle life and excellent charging performance.
DISCLOSURE OF THE INVENTION
The first aspect of the present invention is characterized by a lead storage battery comprising a positive electrode and a negative electrode. The negative electrode contains a negative electrode active substance to which a negative electrode additive is added. The negative electrode additive is a phenol.multidot.aminobenzene sulfonic acid.multidot.formaldehyde condensate.
The effect of the present invention is hereinafter described.
The lead storage battery of the present invention uses a synthetic polymeric product, i.e., phenol.multidot.aminobenzene sulfonic acid.multidot.formaldehyde condensate exhibiting the similar structure to that of the lignin that has been conventionally used and replaced thereby, as the negative electrode additive.
The above phenol.multidot.aminobenzene sulfonic acid.multidot.formaldehyde condensate serves to inhibit the negative electrode from decreasing its surface area and shrinking. Therefore the charging/discharging reactivity can be remained. The cycle life of the lead storage battery can be prolonged and the charging performance thereof can be enhanced.
The present invention provides the lead storage battery presenting 2 to 3 times higher charging performance compared with that of the conventional lead storage battery using the lignin as the negative electrode additive. The cycle life of the lead storage battery of the present invention is similar to that of the conventional lead storage battery.
The lignin as the conventional negative electrode additive is a natural product belonging to the group of phenol polymer that has the structure formed by combining a plurality of unit structures in a complex manner. The lignin has the portion that is likely to be oxidized/deoxidized, i.e., carbonyl group and the like. This portion is oxidized or deoxidized accompanied with charging/discharging of the lead storage battery. As a result, the lignin is decomposed.
The phenol.multidot.aminobenzene sulfonic acid.multidot.formaldehyde condensate of the present invention is the phenol polymer having the same water solubility as that of the lignin. However unlike the lignin, this substance is a synthetic product as the polymer in which specific unit structures are sequentially combined having no portion susceptible to be oxidized/deoxidized such as the carbonyl group of the lignin.
As a result, the above phenol.multidot.aminobenzene sulfonic acid.multidot.formaldehyde condensate is hardly decomposed compared with the lignin in the process of charging/discharging of
REFERENCES:
GS News, vol. 37, No. 1, pp. 22-28, 1978. Effect of Lignin Additive in Negative Electrode for Lead-Acid Battery.
Kamio Takaki
Kawamura Masanobu
Mizutani Muneharu
Yamada Katsumi
Aisin Seiki Kabushiki Kaisha
Nippon Paper Industries Co. Ltd.
Nuzzolillo Maria
Weiner Laura
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