Method for preparing nickel positive electrode of nickel-metal hydride secondary battery by using cobalt-aluminum hydrotalcite and application thereof

A secondary battery, hydrotalcite technology, applied in battery electrodes, nickel storage batteries, alkaline storage battery electrodes and other directions, can solve the problems of complex synthesis, high process conditions, etc., achieve simple synthesis process, controllable material morphology, conditions mild effect

Inactive Publication Date: 2015-03-25
付春平
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The addition of different Co materials has a significant impact on the nickel positive electrode, but there are few related studies at present. The cobalt additives used in the nickel positive electrode of the nickel-metal hydride battery are only traditional products such as elemental metal cobalt, cobaltous oxide, cobalt hydroxide, and cobalt carbonyl oxide. There are few innovations and improvements, while most of the traditional cobalt additives are complicated to synthesize and require high process conditions

Method used

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  • Method for preparing nickel positive electrode of nickel-metal hydride secondary battery by using cobalt-aluminum hydrotalcite and application thereof
  • Method for preparing nickel positive electrode of nickel-metal hydride secondary battery by using cobalt-aluminum hydrotalcite and application thereof
  • Method for preparing nickel positive electrode of nickel-metal hydride secondary battery by using cobalt-aluminum hydrotalcite and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Dissolve 7.47 parts by weight of analytically pure cobalt nitrate in 100 parts by weight of deionized water; dissolve 3.75 parts by weight of analytically pure aluminum nitrate in 100 parts by weight of deionized water, and mix the above two solutions evenly to form a salt solution . 3.2 parts by weight of sodium hydroxide and 2.12 parts by weight of sodium carbonate were dissolved in 50 parts by weight of deionized water to form a mixed alkali solution.

[0034] Under strong mechanical stirring, slowly add the salt solution and alkali solution dropwise into 50 parts by weight of deionized water, control the pH value of the solution to 9-10, and the temperature to 60-80°C, and continue to stir for 90 minutes. Co-precipitation method React for 4-6 hours, age for 15-20 hours; finally filter the precipitate, wash with distilled water until the filtrate is neutral, and dry at 50-100°C for 8-10 hours to obtain the molar ratio of cobalt ions to aluminum ions It is a 4:1 coba...

Embodiment 2

[0037] Dissolve 9.96 parts by weight of analytically pure cobalt nitrate in 100 parts by weight of deionized water; dissolve 3.75 parts by weight of analytically pure aluminum nitrate in 100 parts by weight of deionized water, and mix the above two solutions evenly to form a salt solution . 3.2 parts by weight of sodium hydroxide and 2.12 parts by weight of sodium carbonate were dissolved in 50 parts by weight of deionized water to form an alkaline solution.

[0038] Under strong mechanical stirring, slowly drop the salt solution and alkali solution into 50 parts by weight of deionized water, control the pH of the solution to 9-10, continue to stir for 90 minutes, age for 18 hours, and finally filter and wash the precipitate , and dried at 80°C for 4 hours to obtain a cobalt-aluminum hydrotalcite sample with a molar ratio of cobalt ions to aluminum ions of 4:1.

[0039] 0.4g cobalt aluminum hydrotalcite, 0.5g nickel hydroxide, 0.04g graphite, 0.04g acetylene black, 0.01g sodi...

Embodiment 3

[0041] Dissolve 12.45 parts by weight of analytically pure cobalt nitrate in 100 parts by weight of deionized water; dissolve 3.75 parts by weight of analytically pure aluminum nitrate in 100 parts by weight of deionized water, and mix the above two solutions evenly to form a salt solution . 3.2 parts by weight of sodium hydroxide and 2.12 parts by weight of sodium carbonate were dissolved in 50 parts by weight of deionized water to form an alkaline solution.

[0042] Under strong mechanical stirring, slowly drop the salt solution and alkali solution into 50 parts by weight of deionized water, control the pH of the solution to 9-10, continue to stir for 90 minutes, age for 18 hours, and finally filter and wash the precipitate , and dried at 80°C for 4 hours to obtain a cobalt-aluminum hydrotalcite sample with a molar ratio of cobalt ions to aluminum ions of 5:1.

[0043]Put 0.35g of cobalt aluminum hydrotalcite, 0.55g of nickel hydroxide, 0.05g of acetylene black, 0.025g of t...

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Abstract

The invention discloses a method for preparing a nickel positive electrode of a nickel-metal hydride secondary battery by using cobalt-aluminum hydrotalcite. The method is characterized by comprising the following steps: a, mechanically mixing 30-40 parts by weight of cobalt-aluminum hydrotalcite, 50-60 parts by weight of nickelous hydroxide, 5-10 parts by weight of conductive agents to obtain a nickel-metal hydride battery positive electrode material mixture; b, adding dispersing agent solutions into the positive electrode material mixture in the step (a); ball-milling and adding adhesives for performing ball-milling for 3-5 hours to obtain a nickel positive electrode material with uniform mixing; and c, uniformly tabletting the nickel positive electrode material in the step (b) on current collector foam nickel and drying at the temperature of 60-200 DEG C, and cutting to obtain nickel positive electrode pole pieces. According to the nickel electrode of the nickel-metal hydride secondary battery, cobalt-aluminum hydrotalcite is used as an additive, the performance of the battery can be obviously improved, the capacity density and the power density of the battery can be improved, the charging / discharging cycle life of the battery is prolonged, the over-charging resistance capability is improved, and the self-discharging is reduced.

Description

technical field [0001] The invention relates to the preparation of a nickel positive electrode of a nickel-hydrogen secondary battery by cobalt-aluminum hydrotalcite, which belongs to the technical field of new materials, and in particular relates to a method for preparing a nickel positive electrode of a nickel-hydrogen secondary battery from cobalt-aluminum hydrotalcite and an application thereof. Background technique [0002] Ni-MH batteries have the advantages of wide operating temperature range, good high-current discharge performance, and little environmental pollution. At present, it has been widely used in notebook computers, video cameras, especially in the fields of automobiles and aviation. The performance of nickel-metal hydride batteries is closely related to the electrode materials of positive and negative electrodes. In recent years, hydrogen storage alloys as active materials for negative electrodes have developed rapidly, so that the capacity of nickel-hydro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/32H01M4/62H01M4/26
CPCH01M4/24H01M4/32H01M4/62H01M10/30Y02E60/10
Inventor 付春平杨占红
Owner 付春平
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