Ni-Co alkaline secondary cell and preparation of the electrode material therefor
A technology for secondary batteries and electrode materials, applied in the directions of alkaline storage battery electrodes, alkaline storage batteries, etc., can solve the problems of unreported preparation methods, and achieve the effects of good electrochemical performance, wide application prospects, and simple preparation methods.
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Embodiment 1
[0041] Example 1: Synthesis of α-Co(OH) by chemical precipitation 2 Electrode material, the steps are as follows:
[0042] 1) Take 0.1 mole of cobalt nitrate (Co(NO 3 ) 2 ·6H 2 O), 0.6 mole of sodium chloride (NaCl), 1 mole of urea (CO(NH 2 ) 2 ), with the volume ratio of ethanol and water as a 1:5 mixed solution to dissolve, to prepare 200ml of cobalt ion concentration as a reaction solution of 0.5mol / L;
[0043] 2) Put the reaction solution into a water bath under magnetic stirring, the reaction temperature is 60°C, and the reaction time is 2 hours. After the reaction is completed, stop heating and continue stirring for 1 hour to obtain green α-Co(OH) 2 precipitation;
[0044] 3) α-Co(OH) 2 The precipitate was washed with natural water and ethanol until the pH of the eluate was neutral, and dried to constant weight under vacuum and room temperature to obtain powdered α-Co(OH) 2 .
[0045] Its crystal structure was determined by XRD (X-ray powder diffraction method),...
Embodiment 2
[0047] Embodiment 2: Synthesis of β-Co(OH) by chemical precipitation method 2 Electrode material, the steps are as follows:
[0048] 1) Get 0.4 moles of cobalt sulfate (CoSO4 7H2O), 2 moles of hexamethylenetetramine (C 6 h 12 N 4 ), the volume ratio of distilled water and propanol is 11: 1 mixed solution dissolving, is mixed with the reaction solution that 400mL cobalt ion concentration is 1mol / L;
[0049] 2) Put the reaction solution into a water bath under magnetic stirring, the reaction temperature is 85°C, and the reaction time is 3 hours. After the reaction is completed, stop heating and continue stirring for 2 hours to obtain pink β-Co(OH) 2 precipitation;
[0050] 3) Add β-Co(OH) 2 The precipitate was washed with distilled water and propanol until the pH of the eluate was neutral, and dried to constant weight under vacuum and room temperature to obtain powdered β-Co(OH) 2 . .
[0051] Its crystal structure was determined by XRD (X-ray powder diffraction method),...
Embodiment 3
[0053] Example 3: Synthesis of Al-substituted α-Ni(OH) by hydrothermal treatment after chemical co-precipitation 2 Electrode material, the steps are as follows:
[0054] 1) Take 1 mole of nickel sulfate (NiSO 4 ·6H 2 O), 0.2 mole aluminum nitrate (Al(NO 3 ) 3 9H 2 (2) (equivalent to 10% of the total moles of nickel salt and aluminum salt), adding water and being mixed with 200mL of nickel ion concentration is the reaction solution of 5mol / L;
[0055] 2) Take 1.5 moles of NaOH (equivalent to 150% of the moles of nickel salt), add 200 mL of water to dissolve, and prepare an alkaline precipitant solution with a concentration of NaOH of 7.5 mol / L;
[0056] 3) Under the condition of stirring, add the reaction solution into the precipitant solution, control the reaction droplet velocity, so that the pH value of the reaction system is maintained at 9.0, the temperature of the reaction solution is 50°C, and the stirring is stopped after the reaction to obtain a green precipitate ...
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