Method for preparing battery cathode material calcium zincate and sealing device used for the same

A battery negative electrode and sealing device technology, which is applied to battery electrodes, chemical instruments and methods, circuits, etc., can solve the problems of not considering the solubility of ZnO, the uncertain ratio of added raw materials, and the inability to realize mother liquor circulation, etc., so as to achieve convenient operation costs Easy to operate, low cost, no pollution to the environment, and shortened drying time

Inactive Publication Date: 2008-09-17
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Patent CN 1220779 and patent CN 1397498 all adopt solid-phase synthesis to synthesize calcium zincate, and wherein the former is to ZnO and Ca(OH) in KOH solution 2 Stirring for a long time, the synthesized product needs to be thoroughly washed and dried, the cost is high, and the pollution to the environment is huge, and its fatal shortcoming is that the solubility of ZnO in the KOH solution is not considered, resulting in the addition of raw materials. There is a certain uncertainty in the ratio, so the prepared products often have a small amount of unreacted ZnO or Ca(OH) 2 residual, resulting in low purity

Method used

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  • Method for preparing battery cathode material calcium zincate and sealing device used for the same
  • Method for preparing battery cathode material calcium zincate and sealing device used for the same
  • Method for preparing battery cathode material calcium zincate and sealing device used for the same

Examples

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Example Embodiment

[0019] The preparation of calcium zincate, a negative electrode material for zinc-nickel rechargeable batteries, includes the following steps:

[0020] (1) There is a reaction vessel that can be continuously stirred in the sealed cavity 3, and the ZnO and Ca(OH) 2 Add to the reaction vessel in the sealed cavity 3 containing the NaOH solution in a molar ratio of 2:1, close the small door 8 of the sealed cavity 3, turn on the blower 1, and make the reactants continuously stir at 55-95°C React for 10-16 hours;

[0021] (2). The product after the reaction is directly subjected to suction filtration once, the product after suction filtration is washed once with absolute ethanol, and then the second suction filtration is carried out. The calcium zincate after the second suction filtration is at 20-100 Dry in a vacuum drying oven at ℃ for 2-10 hours;

[0022] (3) Recover the filtrate of the first suction filtration as the reaction medium for recycling, recover the absolute ethanol in the...

Example Embodiment

[0028] Example 1:

[0029] Put 3.70 kg of calcium hydroxide powder and 8.15 kg of zinc oxide powder into the reaction vessel in the sealed cavity 3 containing 5% NaOH mother liquor, close the small door 8 of the sealed cavity 3, and start the protective gas device. React for 15 hours under constant stirring at 65°C. The reacted mixture is directly filtered by suction, then 10.0 kg of absolute ethanol is added to wash once, and after suction filtered again, it is dried in a vacuum drying oven at 80°C 5h. You can get the desired product calcium zincate.

Example Embodiment

[0030] Example 2:

[0031]Put 3.70 kg of calcium hydroxide powder and 8.15 kg of zinc oxide powder into the reaction vessel in the sealed cavity 3 containing 10% NaOH mother liquor, close the small door 8 of the sealed cavity 3, and start the protective gas device. React for 10 hours at 75°C under constant stirring. The reaction mixture is directly filtered by suction, and then 10.0 g of absolute ethanol is added to wash once, and after suction and filtering again, it is carried out in a vacuum drying oven at 20°C. Dry for 10h. You can get the desired product calcium zincate.

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Abstract

The invention discloses a preparation method for battery negative electrode material calcium zincate, which comprises the following steps: adding ZnO and Ca (OH) 2 in a seal chamber with NaOH solution according to the molar ratio of 2:1; switching on a blower; continuously stirring reactant at 55 to 95 DEG C for 10 to 16 hours; directly pumping the products after reaction for filtration, washing the products after pumping filtration using anhydrous alcohol, then performing the pumping filtration again, and drying the calcium zincate after the second pumping filtration in a vacuum drying box at 20 to 100 DEG C for 2 to 10 hours; recovering the filtrate of the first pumping filtration as the reaction medium for recycle utilization, recovering the anhydrous alcohol in filtrate of the second pumping filtration for recycle utilization after fractionation. The preparation method of the battery negative electrode material calcium zincate has the advantages of recyclability of mother liquor and alkali liquor, applicability to industrial mass production, low cost, environmental friendliness, and ability to effectively prevent acidization of products during the preparation of calcium zincate due to a sealing device.

Description

technical field [0001] The invention relates to a method for preparing calcium zincate, an anode material of a zinc-nickel secondary battery, in particular to the preparation for environmental protection and large-scale production and the sealing device used therefor. Background technique [0002] Alkaline secondary zinc-nickel batteries have large specific energy, cheap raw materials, no mercury and cadmium, and no pollution to the environment, so they have attracted widespread attention. Especially in electric vehicles, electric bicycles and portable electrical appliances, etc., zinc-nickel batteries are power sources with great application potential and ideal use value. However, problems such as dendrite growth, dissolution corrosion, and electrode deformation of zinc electrodes seriously restrict the development and utilization of zinc-nickel batteries. In order to solve the above-mentioned problems, various methods have been tried. Among them, it is proved that the mo...

Claims

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Application Information

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IPC IPC(8): C01G9/00C01F11/00H01M4/58
CPCY02E60/10
Inventor 杨占红王升威
Owner CENT SOUTH UNIV
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