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

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...

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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 of the product after the reaction

The latter is to make ZnO, Ca(OH) 2 React with water to form calcium zincate, the amount of product prepared is less and the reaction is incomplete, which is not conducive to large-scale production

Patent CN 100355120C adopts adding soluble zinc salt and calcium salt into the alkaline solution which is constantly stirred to prepare calcium zincate. The disadvantage is that the anions of soluble zinc salt and calcium salt will accumulate in the mother liquor, and the mother liquor cannot be produced. cycle, and discharge into the environment will inevitably cause environmental pollution

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