Preparation method for 3D Ni-Co bimetallic hydroxide hollow microsphere and application in super capacitor

Abstract

The invention belongs to the field of chemistry, and provides a preparation method for a 3D Ni-Co bimetallic hydroxide hollow microsphere and application in a super capacitor. The preparation method comprises the following steps: 1) a SiO2 microsphere is synthesized; 2) a AlOOH sol is prepared; 3) the SiO2 microsphere is added into the AlOOH sol so that a SiO2@ AlOOH microsphere is obtained; 4) the SiO2@ AlOOH microsphere, a alkali source and de-ionized water are mixed, and a nickel and cobalt salt precursor is added so that the 3D Ni-Co bimetallic hydroxide hollow microsphere is prepared; and 5) an electrode sheet is prepared. Compared with methods in the prior art, the obtained 3D Ni-Co bimetallic hydroxide hollow microsphere provides a larger specific surface, smaller mass transfer resistance and more excellent structural stability. Besides, the synthesized 3D Ni-Co bimetallic hydroxide hollow microsphere is applied to electrode material of the super capacitor so that the 3D Ni-Co bimetallic hydroxide hollow microsphere is much better than existing precious metal oxide on aspects of cost and performance.

Description

technical field

[0001] The invention belongs to the field of chemical industry, and in particular relates to a preparation method of 3D nickel-cobalt double metal hydroxide hollow microspheres and their application in supercapacitors. Background technique

[0002] Supercapacitor is a new type of energy storage device developed in the 1970s and 1980s. It is a power supply with special performance between traditional capacitors and batteries. It mainly relies on electric double layer and redox quasi-capacitance to store electric energy. , which is different from traditional chemical power sources. The outstanding advantages of supercapacitors are high power density, short charge and discharge time, long cycle life and wide operating temperature range. They have broad application prospects in national defense, railways, electric vehicle electronics, communications, aerospace and other fields. According to the energy storage mechanism, supercapacitors can be divided into electr...

Examples

Embodiment 1

[0040] Dissolve ethyl orthosilicate in absolute ethanol (V:V=1:8), and stir for 10 min to obtain liquid A. Mix concentrated ammonia water and absolute ethanol (V:V=1:5) to obtain liquid B. On a constant temperature water bath at 40°C, slowly add liquid A to liquid B, stir and react for 10 hours, remove ethanol by rotary evaporation, collect the precipitate, wash with absolute ethanol, and dry in vacuum at 60°C to obtain monodisperse silica microspheres; Add 11.3g of aluminum isopropoxide to 100ml of deionized water, stir at 85°C until completely dissolved, then slowly drop in 1mol / L HNO 3 To pH 3-4, continue to react for 2 hours, cool and dry to obtain blocky transparent solid. Weigh 5.8g of this solid and dissolve it in 107ml of deionized water, stir for 1 hour, and slowly add 9.5ml of 1mol L at 85°C -1 HNO 3 , reflux for 6 hours to obtain a light blue AlOOH sol; add silica microspheres to an equal mass of AlOOH sol, stir vigorously for 2 hours, centrifuge, wash with absol...

Embodiment 2

[0042] Dissolve ethyl orthosilicate in absolute ethanol (V:V=1:8), and stir for 10 min to obtain liquid A. Mix 0.1 molL-1 sodium hydroxide solution with absolute ethanol (V:V=1:8), and stir for 20 min to obtain liquid B. On a constant temperature water bath at 50°C, slowly add liquid A into liquid B, stir for 8 hours, remove ethanol by rotary evaporation, collect the precipitate, wash with absolute ethanol, and dry in vacuum at 70°C to obtain monodisperse silica microspheres; Add 10.9g of aluminum isopropoxide to 100ml of deionized water, stir at 90°C until completely dissolved, then slowly drop in 2mol L -1 HNO 3 To pH 3-4, continue to react for 4 hours, cool, and dry to obtain blocky transparent solid. Dissolve 6.5g of this solid in 100ml of deionized water, stir for 1 hour, and slowly add 6ml of 1mol L -1 HNO 3 , reflux for 5 hours to obtain a light blue AlOOH sol; add silica microspheres to an equal mass of AlOOH sol, stir vigorously for 4 hours, centrifuge, wash with...

Embodiment 3

[0044] Dissolve ethyl orthosilicate in absolute ethanol (V:V=1:8), and stir for 10 min to obtain liquid A. Mix concentrated ammonia water and absolute ethanol (V:V=1:8) to obtain liquid B. On a 40°C constant temperature water bath, slowly add liquid A to liquid B, stir for 6 hours, remove ethanol by rotary evaporation, collect the precipitate, wash with absolute ethanol, and dry in vacuum at 70°C to obtain monodisperse silica microspheres; in 100ml Add 8.8g of aluminum isopropoxide to deionized water, stir at 60°C until completely dissolved, slowly drop in 1mol / L HNO 3 To pH 3-4, continue to react for 3 hours, cool and dry to obtain blocky transparent solid. Weigh 8.2g of this solid and dissolve it in 120ml deionized water, stir vigorously for 1 hour, slowly add 12ml mol L at 65°C -1 HCl, reflux for 8 hours to obtain a light blue AlOOH sol; add silica microspheres to an equal mass of AlOOH sol, stir vigorously for 6 hours, centrifuge, collect the precipitate, wash with absol...

technical field

[0001] The invention belongs to the field of chemical industry, and in particular relates to a preparation method of 3D nickel-cobalt double metal hydroxide hollow microspheres and their application in supercapacitors. Background technique

[0002] Supercapacitor is a new type of energy storage device developed in the 1970s and 1980s. It is a power supply with special performance between traditional capacitors and batteries. It mainly relies on electric double layer and redox quasi-capacitance to store electric energy. , which is different from traditional chemical power sources. The outstanding advantages of supercapacitors are high power density, short charge and discharge time, long cycle life and wide operating temperature range. They have broad application prospects in national defense, railways, electric vehicle electronics, communications, aerospace and other fields. According to the energy storage mechanism, supercapacitors can be divided into electr...

Examples

Embodiment 1

[0040] Dissolve ethyl orthosilicate in absolute ethanol (V:V=1:8), and stir for 10 min to obtain liquid A. Mix concentrated ammonia water and absolute ethanol (V:V=1:5) to obtain liquid B. On a constant temperature water bath at 40°C, slowly add liquid A to liquid B, stir and react for 10 hours, remove ethanol by rotary evaporation, collect the precipitate, wash with absolute ethanol, and dry in vacuum at 60°C to obtain monodisperse silica microspheres; Add 11.3g of aluminum isopropoxide to 100ml of deionized water, stir at 85°C until completely dissolved, then slowly drop in 1mol / L HNO 3 To pH 3-4, continue to react for 2 hours, cool and dry to obtain blocky transparent solid. Weigh 5.8g of this solid and dissolve it in 107ml of deionized water, stir for 1 hour, and slowly add 9.5ml of 1mol L at 85°C -1 HNO 3 , reflux for 6 hours to obtain a light blue AlOOH sol; add silica microspheres to an equal mass of AlOOH sol, stir vigorously for 2 hours, centrifuge, wash with absol...

Embodiment 2

[0042] Dissolve ethyl orthosilicate in absolute ethanol (V:V=1:8), and stir for 10 min to obtain liquid A. Mix 0.1 molL-1 sodium hydroxide solution with absolute ethanol (V:V=1:8), and stir for 20 min to obtain liquid B. On a constant temperature water bath at 50°C, slowly add liquid A into liquid B, stir for 8 hours, remove ethanol by rotary evaporation, collect the precipitate, wash with absolute ethanol, and dry in vacuum at 70°C to obtain monodisperse silica microspheres; Add 10.9g of aluminum isopropoxide to 100ml of deionized water, stir at 90°C until completely dissolved, then slowly drop in 2mol L -1 HNO 3 To pH 3-4, continue to react for 4 hours, cool, and dry to obtain blocky transparent solid. Dissolve 6.5g of this solid in 100ml of deionized water, stir for 1 hour, and slowly add 6ml of 1mol L -1 HNO 3 , reflux for 5 hours to obtain a light blue AlOOH sol; add silica microspheres to an equal mass of AlOOH sol, stir vigorously for 4 hours, centrifuge, wash with...

Embodiment 3

[0044] Dissolve ethyl orthosilicate in absolute ethanol (V:V=1:8), and stir for 10 min to obtain liquid A. Mix concentrated ammonia water and absolute ethanol (V:V=1:8) to obtain liquid B. On a 40°C constant temperature water bath, slowly add liquid A to liquid B, stir for 6 hours, remove ethanol by rotary evaporation, collect the precipitate, wash with absolute ethanol, and dry in vacuum at 70°C to obtain monodisperse silica microspheres; in 100ml Add 8.8g of aluminum isopropoxide to deionized water, stir at 60°C until completely dissolved, slowly drop in 1mol / L HNO 3 To pH 3-4, continue to react for 3 hours, cool and dry to obtain blocky transparent solid. Weigh 8.2g of this solid and dissolve it in 120ml deionized water, stir vigorously for 1 hour, slowly add 12ml mol L at 65°C -1 HCl, reflux for 8 hours to obtain a light blue AlOOH sol; add silica microspheres to an equal mass of AlOOH sol, stir vigorously for 6 hours, centrifuge, collect the precipitate, wash with absol...