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Lead dioxide coated carbon material, making method and zinc-nickel battery containing the same

A technology for lead dioxide and zinc-nickel batteries, which is applied in battery electrodes, alkaline storage batteries, circuits, etc., and can solve the problems of inability to prepare negative electrode slurry, difficulty in dispersing, and passivation of zinc electrodes.

Inactive Publication Date: 2004-06-02
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When metallic lead is used as an additive to make negative electrode slurry, since Pb (including PbO produced by the natural oxidation of metallic lead in air) will make it difficult to disperse due to the water absorption of binders such as CMC and HPMC, the negative electrode slurry cannot be prepared. , so that the negative electrode sheet cannot be made by the low-cost pulping method
That is to say, if the additive contains metallic lead or lead divalent oxide PbO, the prepared negative electrode slurry cannot contain CMC or HPMC, otherwise the high-rate discharge performance of the zinc-nickel battery will be greatly reduced due to the lack of CMC Water-absorbing agents such as HPMC will cause the zinc electrode to lack sufficient electrolyte solution, thus failing to provide sufficient hydroxide (OH - ) to meet the needs of discharge, especially in high rate and high current discharge, it is easy to cause the passivation of the zinc electrode and make the battery unable to discharge

Method used

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  • Lead dioxide coated carbon material, making method and zinc-nickel battery containing the same
  • Lead dioxide coated carbon material, making method and zinc-nickel battery containing the same
  • Lead dioxide coated carbon material, making method and zinc-nickel battery containing the same

Examples

Experimental program
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Effect test

Embodiment 1

[0041] Take 6 grams of NaClO solution and 2 grams of NaOH to form a solution of 250ml, add 4.8 grams of graphite into the alkaline NaClO solution, and keep stirring. Another 3.04 g of lead acetate was prepared into 100 ml solution, and the lead acetate solution was added dropwise to the alkaline NaClO solution. After the reaction was completed, the solution was filtered with suction, washed with deionized water, and dried. The product is characterized by XRD and SEM, see figure 1 and figure 2 .

Embodiment 2

[0043] Take 12 grams of NaClO solution and 4 grams of NaOH to form a solution of 250ml, add 4.8 grams of graphite into the alkaline NaClO solution, and keep stirring. Another 100ml solution of 7.6 grams of lead acetate was taken, and the lead acetate solution was added dropwise to the alkaline NaClO solution. After the reaction was completed, the solution was filtered with suction, washed with deionized water, and dried. The product was characterized by SEM, see image 3 .

Embodiment 3

[0045]Get 5 grams of coated lead dioxide graphite prepared in Example 1, 16 grams of Belgian mercury-free zinc powder, 59 grams of zinc oxide, and 10 grams of calcium hydroxide are mixed uniformly with a mixing device.

[0046] The above mixture was stirred with 4 grams of PTFE, 0.6 grams of PVA, 0.5 grams of HPMC and 40 grams of deionized water to form a viscous slurry. Above-mentioned slurry is attached to the thick 0.07mm that is plated with Pb-Sn alloy plating layer on the punched copper strip of width 33.5mm by drawing machine again. A negative electrode with a length of 220 mm was obtained by drying, rolling, cutting into pieces and welding a drainage tape.

[0047] Stir 92 grams of spherical nickel hydroxide, 7 grams of cobaltous oxide, 11 grams of conductive carbon black, 4 grams of PTFE, 0.2 grams of CMC, and 40 grams of deionized water into a slurry and apply it to the foamed nickel welded with drainage tape On the surface, a positive electrode with a length of 200 ...

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Abstract

The invention relates to a carbon material, wherein the carbon material is used as a core whose skin layer is covered by lead dioxide, the weight ratio of lead dioxide is 1%-80%. The invention also relates to the method for preparing the material which comprises, filling carbon material into alkaline solution with dissolved oxidant, instilling solution containing diatomic lead ion, transforming it into lead dioxide in the alkaline solution which attaches to the carbon material surface evenly. The invention further relates to a zinc-nickel battery having high discharging performance.

Description

technical field [0001] The invention belongs to the technical field of rechargeable batteries, in particular to a modified carbon material used as a negative electrode additive for a zinc-nickel battery and a manufacturing method thereof, and also to a zinc-nickel battery containing the carbon material. Background technique [0002] In recent years, in the huge market of electric tool batteries and electric toy batteries, Cd / Ni batteries occupy a large share due to their excellent high-current discharge performance, but Cd / Ni batteries pollute the environment, so it is necessary to find alternatives. [0003] Zinc electrodes can withstand high-rate discharge, which has been proven in high-rate zinc-silver batteries, and cadmium-nickel batteries can also be discharged at high rates. Therefore, as long as the process parameters are reasonable, zinc-nickel batteries composed of zinc electrodes and nickel electrodes are acceptable. Withstand high rate discharge. [0004] Among...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M10/24
CPCY02E60/124Y02E60/10
Inventor 朱志坚王传福
Owner BYD CO LTD
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