Prepn of Y-containing spherical nickel hydroxide

A technology of spherical nickel hydroxide and sodium hydroxide, applied in chemical instruments and methods, electrode manufacturing, inorganic chemistry, etc., can solve problems such as unsatisfactory, high-temperature performance improvement of batteries, achieve good high-temperature charge and discharge performance, and have great application value Effect

Inactive Publication Date: 2003-05-14
TSINGHUA UNIV +1
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Problems solved by technology

In order to improve the high-temperature performance of nickel-hydrogen batteries, the existing method is to add certain substances (such as rare earth oxides such as calcium oxide, yttrium oxide or ytterbium oxide) and mix them with spherical nickel hydroxide by mechanical mixing when making the positive electrode. , but the high-temperature performance of the battery has not improved satisfactorily

Method used

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Examples

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preparation example Construction

[0016] 1). Preparation of yttrium spherical nickel hydroxide:

[0017] ① Add YCl to nickel, cobalt, zinc sulfate solution 3 Aqueous solution, prepared as a mixed brine solution, in which: Ni 2+ The concentration is 1.5~2 mol / liter, Ni:Co:Zn:Y=100:0~4:0~8:0~4 (molar ratio);

[0018] ② Prepare sodium hydroxide aqueous solution, the concentration of sodium hydroxide is 4-6 mol / liter; prepare ammonia solution, the concentration of ammonia is 10-14 mol / liter;

[0019] ③Put the above-mentioned mixed brine solution, sodium hydroxide solution and ammonia solution into the reactor continuously with a pump, and the mixed material in the reactor will naturally overflow and discharge, and adjust the flow rate of each solution to make the average residence time of the material in the reactor 9 to 12 hours, NH 3 / Ni=0.5~1, the pH value of the reaction solution is 11~12, and the reaction temperature is controlled at 40~60°C;

[0020] 4. The product obtained in step 3. is transferred to a...

Embodiment 1

[0027] Embodiment one, with NiSO 4 ·6H 2 O. CoSO 4 ·7H 2 O, ZnSO 4 ·7H 2 O and 1.5 mol / L YCl 3 Solution preparation mixed brine solution, in which: NiSO 4 The concentration is 1.7 mol / liter, Ni:Co:Zn:Y=100:2.5:5:1 (molar ratio). Prepare 5 mol / L NaOH aqueous solution and 12 mol / L NH 3 aqueous solution. The effective volume of the reactor was 5 liters, and 5 liters of deionized water were added in advance. Use a metering pump to mix the above mixed brine solution, NaOH aqueous solution and NH 3 The aqueous solution is continuously input into the reactor respectively, the stirring speed of the control reactor is 1500 rpm, the flow rate of the mixed brine solution is 5 ml / min, and the NH 3 The flow rate of the aqueous solution is 1 ml / min, and the pH value of the reaction solution is controlled to be 11.50±0.02 by adjusting the flow rate of the NaOH aqueous solution. The reaction temperature is 50±0.05°C. The reaction product and mother liquor naturally overflow into t...

Embodiment 2

[0028] Embodiment 2, the composition ratio of mixed brine solution is: Ni: Co: Zn: Y=100: 1.5∶3 : 2 (molar ratio), NiSO 4 The concentration is 1.5 mol / liter, and other conditions are identical with embodiment one.

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Abstract

The present invention belongs to a preparation process of Y-containing spherical nickel hydroxide in the field of chemical material preparation. Through coprecipitation process, solid solution of hydroxide of Y and Ni is formed and prepared into Y-containing spherical nickel hydroxide; or through chemical precipitation process, one layer of ytterbium hydroxide is coated to the surface of spherical ytterbium hydroxide particles with or without ytterbium. The solid solution type or coated Y-containing spherical nickel hydroxide, when it has a molar Y/Ni ratio of 1-3%, aas obviously improved charge and discharge performance at 60 deg.c.

Description

technical field [0001] The invention belongs to the field of chemical material preparation, in particular to a preparation method of yttrium-containing spherical nickel hydroxide used for alkaline rechargeable batteries. Background technique [0002] Spherical nickel hydroxide is a positive electrode active material for alkaline rechargeable batteries such as nickel-hydrogen batteries. At present, nickel-hydrogen batteries have been widely used in electronics, communications and other fields, and have shown good application prospects in the field of electric vehicles. As the power source of electric vehicles, batteries often undergo high-rate charging and discharging during use. At this time, the battery will generate heat and cause a temperature rise. At present, the charging and discharging performance of the commercialized nickel-hydrogen battery is significantly reduced at high temperature (50-60°C), and the charging efficiency at 60°C is only about 50% of that at norma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00H01M4/52
CPCY02E60/12Y02E60/10
Inventor 姜长印阎杰万春荣米欣应皆荣何向明
Owner TSINGHUA UNIV
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