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A method for preparing battery negative electrode active material calcium zincate by jet mill

A technology of battery negative electrode and active material, applied in battery electrodes, nickel storage batteries, alkaline storage batteries, etc., can solve the problems of low charge-discharge performance and cycle performance, long production time, low stability, etc., to avoid the phenomenon of flatulence , The effect of large production capacity and uniform fineness

Active Publication Date: 2018-04-17
秦立新
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of the above method are: the production time is long (7-72h), there are irregular small particles or small protrusions, and the stability is low, the charge and discharge performance and cycle performance are not high, and the voltage is low
In the later stage of charging, the zinc electrode also produces dendritic deposits, which can pierce the separator and cause an internal short circuit in the battery, causing the premature termination of battery life

Method used

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  • A method for preparing battery negative electrode active material calcium zincate by jet mill
  • A method for preparing battery negative electrode active material calcium zincate by jet mill
  • A method for preparing battery negative electrode active material calcium zincate by jet mill

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Effect test

Embodiment 1

[0036] The method for preparing the battery negative electrode active material calcium zincate by jet mill of the present embodiment comprises the following steps:

[0037] Step 1: After mixing and stirring zinc oxide, calcium hydroxide and deionized water in a weight ratio of 4:4:1, the particle diameters of the zinc oxide and calcium hydroxide are both 50-150 mesh, and put them into the jet mill Material inlet 1, the pressure of the material inlet 1 is 0.4-0.8MPa, and then enters the crushing chamber 3 through the riser 2, the pressure of the crushing chamber 3 is 0.002-0.01MPa, and the crushed material is obtained;

[0038] Step 2: Enter the pulverized material obtained in Step 1 into the classification chamber 4 for classification, and the speed of the classification is 3000-6000 rpm to obtain the classified particles;

[0039] Step 3: The classified particles obtained in step 2 are returned to the crushing chamber (3) with a particle size of ≤1000 mesh for re-grinding; th...

Embodiment 2

[0041] The method for preparing the battery negative electrode active material calcium zincate by jet mill of the present embodiment comprises the following steps:

[0042] Step 1: After mixing and stirring zinc oxide, calcium hydroxide and deionized water in a weight ratio of 6:6:1, the particle diameters of the zinc oxide and calcium hydroxide are both 50-150 mesh, and put them into the jet mill Material inlet 1, the pressure of the material inlet 1 is 0.4-0.8MPa, and then enters the crushing chamber 3 through the riser 2, the pressure of the crushing chamber 3 is 0.002-0.01MPa, and the crushed material is obtained;

[0043] Step 2: Enter the pulverized material obtained in Step 1 into the classification chamber 4 for classification, and the speed of the classification is 3000-6000 rpm to obtain the classified particles;

[0044] Step 3: The classified particles obtained in step 2 are returned to the crushing chamber (3) with a particle size of ≤1000 mesh for re-grinding; th...

Embodiment 3

[0046] The method for preparing the battery negative electrode active material calcium zincate by jet mill of the present embodiment comprises the following steps:

[0047] Step 1: After mixing and stirring zinc oxide, calcium hydroxide and deionized water in a weight ratio of 5:5:1, the particle diameters of the zinc oxide and calcium hydroxide are both 50-150 mesh, and put them into the jet mill Material inlet 1, the pressure of the material inlet 1 is 0.4-0.8MPa, and then enters the crushing chamber 3 through the riser 2, the pressure of the crushing chamber 3 is 0.002-0.01MPa, and the crushed material is obtained;

[0048] Step 2: Enter the pulverized material obtained in Step 1 into the classification chamber 4 for classification, and the speed of the classification is 3000-6000 rpm to obtain the classified particles;

[0049] Step 3: The classified particles obtained in step 2 are returned to the crushing chamber (3) with a particle size of ≤1000 mesh for re-grinding; th...

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Abstract

The invention discloses a method for preparing an active material calcium zincate of a cathode of a battery by utilizing an airflow mill and belongs to the technical field of an active material of a zinc nickel battery. The method comprises the following steps: 1) uniformly mixing and stirring zinc oxide, calcium hydroxide and deionized water at a weight ratio of (4-6):(4-6):1, and then putting the mixture into a material inlet of the airflow mill and entering into a crushing chamber through an ascending pipe, thereby acquiring a crushed material; 2) putting the crushed material acquired in the step 1) into a classifying chamber for classifying, thereby acquiring classified particles; and 3) returning the classified particles acquired in the step 2), of which the grain size is less than or equal to 1000 meshes, to the crushing chamber for crushing, and discharging the classified particles of which the grain size is more than 1000 meshes from a product outlet, namely, acquiring the active material calcium zincate of the cathode of the battery. The calcium zincate product acquired according to the method is uniform in fineness, regular in particle shape, high in purity and high in material activity. The charging / discharging cycle life can reach above 3000 times.

Description

technical field [0001] The invention relates to a method for preparing calcium zincate, a negative electrode active material of a battery, by using a jet mill, and belongs to the technical field of active materials for zinc-nickel batteries. Background technique [0002] At present, the main preparation methods of zinc-nickel battery negative active material calcium zincate are: 1. chemical synthesis method; 2. co-precipitation method; 3. oscillation method; 4. ball milling method. The disadvantages of the above method are: the production time is long (7-72h), there are irregular small particles or small protrusions, and the stability is low, the charge and discharge performance and cycle performance are not high, and the voltage is low. In particular, the solubility of the discharge product of the zinc negative electrode in the potassium hydroxide electrolyte is large, and uneven zinc deposition is likely to occur due to irregular calcium zincate during charging. After cha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G9/00H01M4/58H01M10/30
CPCC01G9/00C01P2004/03C01P2006/40C01P2006/80H01M4/5825H01M10/30Y02E60/10
Inventor 秦立新沈国珍
Owner 秦立新
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