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Preparation method for ultrafine calcium zincate crystal applied to zinc battery

A calcium zincate and zinc battery technology, which is applied in the manufacture of alkaline storage batteries, secondary batteries, battery electrodes, etc., can solve the problems of industrial production efficiency, limited equipment, large particle size, etc., and achieve the goal of inhibiting zinc dendrites Generation, improvement of electrical properties, small particle size effect

Inactive Publication Date: 2019-10-29
KUNMING METALLURGY INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] For this reason, the embodiment of the present invention provides a method for preparing ultra-fine calcium zincate crystals for zinc batteries to solve the problem of introducing impurities, large particle size or limited equipment during the preparation of calcium zincate crystals in the prior art, which cannot be industrially produced. and the problem of low production efficiency

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  • Preparation method for ultrafine calcium zincate crystal applied to zinc battery
  • Preparation method for ultrafine calcium zincate crystal applied to zinc battery
  • Preparation method for ultrafine calcium zincate crystal applied to zinc battery

Examples

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Embodiment 1

[0032] This embodiment is a preparation method of ultrafine calcium zincate crystals for zinc batteries, the preparation method comprising the following steps:

[0033] (a) zinc oxide is dissolved in the potassium hydroxide solution of 200ml 5wt%, makes alkaline saturated zinc oxide solution;

[0034] (b) under agitation, add 1.43g of calcium zincate crystal seeds with a particle size of 2000 mesh to the alkaline saturated zinc oxide solution to obtain a mixed solution;

[0035] (c) Under the condition of continuing to stir, calcium hydroxide and zinc oxide were respectively added to the mixed solution at a molar ratio of 1:2 and reacted at 25° C. for 1.5 h, wherein the amount of calcium hydroxide added was 0.2 mol;

[0036] (d) After the reaction is finished, perform suction filtration, washing, and then dry below 50° C. to obtain ultrafine calcium zincate crystals.

Embodiment 2

[0038] This embodiment is a preparation method of ultrafine calcium zincate crystals for zinc batteries, the preparation method comprising the following steps:

[0039] (a) zinc oxide is dissolved in the potassium hydroxide solution of 200ml 25wt%, makes alkaline saturated zinc oxide solution;

[0040] (b) under agitation, add 0.29 g of calcium octanoate crystal seeds with a particle size of 8000 mesh to the alkaline saturated zinc oxide solution to obtain a mixed solution;

[0041] (c) Under the condition of continuous stirring, calcium hydroxide and zinc oxide were added to the mixed solution at a molar ratio of 1:2 and reacted at 45° C. for 6 hours, wherein the amount of calcium hydroxide added was 0.3 mol;

[0042] (d) After the reaction is finished, perform suction filtration, washing, and then dry below 80°C to obtain ultrafine calcium zincate crystals.

Embodiment 3

[0044] This embodiment is a preparation method of ultrafine calcium zincate crystals for zinc batteries, the preparation method comprising the following steps:

[0045] (a) zinc oxide is dissolved in the potassium hydroxide solution of 200ml 15wt%, makes alkaline saturated zinc oxide solution;

[0046] (b) under stirring conditions, adding 0.4 g of calcium octanoate crystal seeds with a particle size of 4000 mesh to the alkaline saturated zinc oxide solution to obtain a mixed solution;

[0047] (c) Under the condition of continuing stirring, calcium hydroxide and zinc oxide were added to the mixed solution at a molar ratio of 1:2 and reacted at 35° C. for 2 hours, wherein the amount of calcium hydroxide added was 0.2 mol;

[0048] (d) After the reaction is finished, perform suction filtration, washing, and then dry below 50° C. to obtain ultrafine calcium zincate crystals.

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Abstract

Embodiments of the invention disclose a preparation method for an ultrafine calcium zincate crystal applied to a zinc battery. The preparation method comprises the following steps: (a) dissolving zincoxide in an alkaline solution to prepare an alkaline saturated zinc oxide solution; (b) adding a calcium silicate seed crystal having a particle size of 2000-8000 meshes into the alkaline saturated zinc oxide solution under stirring to obtain a mixed solution; (c) separately adding calcium hydroxide and zinc oxide in a molar ratio of 1: 2 into the mixed solution for a reaction under the conditionof continuous stirring; and (d) after the reaction is completed, performing suction filtration, washing and drying to obtain the ultrafine calcium zincate crystal. The calcium zincate crystal prepared by using the preparation method of the invention has a small and uniform particle size, a complete crystal form and a high purity, and can effectively inhibit battery deformation and zinc dendrite formation when added to a zinc-nickel battery as a negative electrode material of the battery. The preparation method is short in reaction time, does not require long-time aging, saves energy consumption, and has high labor productivity.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of zinc-nickel batteries, in particular to a method for preparing ultrafine calcium zincate crystals for zinc batteries. Background technique [0002] Zinc-nickel battery is a high-energy-density alkaline storage battery. Its battery performance is much higher than that of cadmium-nickel and nickel-hydrogen batteries. This kind of battery has rich raw materials, non-toxic electrolyte and active materials, and the battery system is green and pollution-free. It has been paid more and more attention by research institutions in various countries. However, the discharge substances of conventional negative electrode materials in zinc-nickel batteries are easily soluble in alkaline electrolytes, resulting in zinc dendrites or electrode deformation, resulting in reduced battery cycle life. In order to suppress the deformation of zinc electrodes and the formation of zinc dendrites, research...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G9/00H01M4/24H01M4/62H01M10/28H01M10/30H01M10/42
CPCC01G9/00C01P2004/51H01M4/244H01M4/62H01M10/28H01M10/30H01M10/4235Y02E60/10Y02P70/50
Inventor 许娜徐庆鑫任玖阳施辉献袁野和晓才郝竞一李永刚徐亚飞
Owner KUNMING METALLURGY INST
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