Lead-acid battery

a lead-acid battery and battery technology, applied in the field of lead-acid batteries, can solve the problems of inability to improve the solubility of lead sulfate into lead ion, and the inability to improve the solubility of lead sulfate into lead ion, and achieve the effect of improving high-efficiency charging characteristics and high-efficiency

Inactive Publication Date: 2004-09-16
HONBO KYOKO +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0010] a lead-acid battery of superior high-efficiency charging characteristic wherein the conductivity of lead sulfate is improved and further the solubility of lead sulfate into lead ion is improved and thereby the charging reaction of anode active material proceeds smoothly, and
[0042] Further, containing a particular simple substance or compound, both having the above-mentioned catalysis highlky, the carbon powder of the present invention, when added into the electrolytic solution or onto the electrode surface, of a lead-acid battery, can accelerate the start of charging. The carbon can be adsorbed on the reaction interface of the active material of the lead-acid battery; thereby, the passivation of lead sulfate which is called sulfation can be suppressed, no passivation proceeds even when complete discharge has been made, and charge acceptability is improved remarkably.

Problems solved by technology

With this addition of an optimum amount of carbon, however, it is impossible to improve the solubility of lead sulfate into lead ion.
Similarly, by allowing an anode active material to contain metallic tin, the conductivity improvement of lead sulfate is possible but the improvement of solubility of lead sulfate into lead ion is impossible.

Method used

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Examples

Experimental program
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Effect test

example 1

Production of Simple Substance- and / or Compound-Loaded Carbons

[0046] In production of simple substance- and / or compound-loaded carbons, first, aqueous nickel nitrate solutions of different concentrations were prepared. Thereto were added 10 g of acetylene black as a carbon powder and 0.1 g of a surfactant. Each resulting mixture was stirred in a water bath of 40.degree. C. Thereto was dropwise added sodium hydroxide until the pH of each mixture became 7. Then, filtration was made. The separated precipitate was washed with distilled water, dried at 120.degree. C. for 2 hours, and fired in the air, nitrogen or hydrogen at 300 to 500.degree. C. for 30 minutes to produce various nickel-loaded carbons. XRD (X-ray diffractometry) indicated that NiO was formed by the firing in the air, Ni was formed by the firing in hydrogen, and a mixture of NiO and Ni was formed by the firing in nitrogen. Incidentally, X-ray diffractometry is a method which measures the intensity of diffraction line whil...

example 2

[0058] Using, as a carbon powder, various carbons shown in Table 2, nickel-loaded carbons were produced in the same manner as in Example 1.

[0059] Lead-acid batteries were produced in the same manner as in Example 1 and measured for high-efficiency charging characteristic. Their charging voltages Vc are shown in Table 2. With all the carbons, the charging voltages Vc were below 45 V and good high-efficiency charging characteristics were obtained. Also, with mixed carbon systems thereof, the charging voltages Vc were below 45 V and good high-efficiency charging characteristics were obtained.

2TABLE 2 Amount of Primary Specific dibutyl Loaded particle surface phthalate Apparent Charging Ni diameter area absorbed density voltage amout Kind of carbon (nm) (m.sup.2 / g) (cm.sup.3 / 100 g) (g / dm.sup.3) Vc(V) (ppm) Carbon black 30 1270 495 115 44.5 10000 Ditto 11 362 270 109 44.8 15000 Ditto 30 254 174 270 43 750 Ditto 15 1475 330 152 43.1 1000 Ditto 13 560 91 400 43.7 1500 Ditto 20 140 117 310 ...

example 3

[0061] Various active carbons were used as a carbon. The contents of Cu, Ni, Mn, Al, Si, K and Mg in the active carbons were measured by ICP spectrometry and are shown in Table 4. Using these active carbons containing various amounts of impurities, lead-acid batteries were produced in the same manner as in Example 1, and their high-efficiency charging characteristics were evaluated. Their charging voltages Vc are shown in Table 4. All the charging voltages Vc were lower than 45 V and their high-efficiency charging characteristics were good.

4TABLE 4 Charging voltage Cu Ni Mn Al Si K Mg Vc Symbol (ppm) (ppm) (ppm) (ppm) (ppm) (ppm) (ppm) (V) 4-a 5 50 10 <1 <1 90 <1 43.1 4-b <1 2200 <1 10 <1 4800 <1 43.1 4-c 500 1050 850 <1 1400 <1 <1 43 4-d 55 75 75 <1 <1 105 250 43 4-e <1 <1 <1 360 <1 <1 <1 44.8 4-f <1 <1 <1 <1 <1 <1 150 44.1

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Abstract

The present invention provides a lead-acid battery superior in high-efficiency charging characteristic to conventional lead-acid batteries; and a carbon material used in the lead-acid battery, having excellent charge acceptability. That is, the present invention provides a lead-acid battery which uses, as an additive to the anode active material, a simple substance and / or a compound thereof, both having a catalysis for desulfurization or a catalysis for SOx oxidation by adding to or loading on a carbon material such as active carbon, carbon black or the like and thereby has superior high-efficiency charging characteristic and improved charging acceptability. When such a lead-acid battery whose anode contains a carbon material containing or loading thereon the above simple substance and / or compound, is applied to electric cars, various hybrid cars, power storage systems, elevators, electromotive tools and power source systems such as uninterruptible power source, distributed power source and the like, all having high input and output requirements, stable control can be obtained.

Description

[0001] 1. Field of the Invention[0002] The present invention relates to a lead-acid battery, particularly a carbon material for a lead-acid battery superior in high-efficiency charging characteristic.[0003] 2. Related Art Statement[0004] A lead-acid battery as a secondary battery is relatively inexpensive and has stable properties; therefore, has been widely used as an electric source for automobiles and portable apparatuses, or as a back-up electric source for computers. Recently, a lead-acid battery has found new applications as a main electric source for electric cars, as an electric source for start-up of hybrid electric cars and simple hybrid cars, or for recovery of regenerated current. In these new applications, a lead-acid battery need to have, in particular, both of high output characteristic and high input characteristic.[0005] Various studies have heretofore been made on the high output characteristic. With respect to the high input characteristic, however, there has been...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B01J21/18B01J23/00H01M4/02H01M4/14H01M4/21H01M4/38H01M4/62H01M10/06
CPCH01M4/14H01M4/21H01M4/624H01M4/625Y02T10/7016H01M4/627H01M10/06H01M2004/027Y02E60/126H01M4/626Y02E60/10Y02T10/70Y02P70/50
Inventor HONBO, KYOKOHOSHI, EIJIMURANAKA, YASUSHITAKEUCHI, SEIJI
Owner HONBO KYOKO
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