Preparation method of sodium alginate-based dual-network carbon aerogel negative electrode material for lithium ion battery

Abstract

The invention discloses a preparation method of a sodium alginate-based dual-network carbon aerogel negative electrode material for a lithium ion battery, and belongs to the technical field of lithium ion battery negative electrode materials. The method comprises the following steps: firstly, preparing a certain amount of sodium alginate powder and agar powder into precursor hydrogel by adopting a sol-gel method; preparing a Mn (NO3) 2 solution and ZnCl2 particles into a mixed solution according to a certain proportion, and immersing the precursor hydrogel into the mixed solution for 6-9 hours to obtain dual-network hydrogel; washing the prepared hydrogel with deionized water for multiple times, and freeze-drying to obtain fluffy double-network aerogel; and finally, carrying out high-temperature carbonization under the protection of inert gas to obtain the sodium alginate-based dual-network carbon aerogel negative electrode material. The operation method is simple and easy to implement, the used raw materials are low in cost and wide in source, the prepared material is good in mechanical performance, conductivity and stability in the charging and discharging process when used for the negative electrode of the lithium ion battery, meanwhile, the pore structure can be kept, and excellent electrochemical performance is achieved.

Description

technical field

[0001] The invention relates to a method for preparing a sodium alginate-based double-network carbon airgel negative electrode material for lithium ion batteries, and belongs to the technical field of lithium ion battery negative electrode materials. Background technique

[0002] Lithium-ion battery (LIB) has the advantages of high voltage, large capacity, fast charging, long life, strong safety, and no memory effect. As a promising new energy material, it has been widely used in portable electronic products, large-scale Energy storage equipment, aerospace, electric vehicles and other fields. However, due to the low theoretical specific capacity (372mAh / g) of graphite anode materials used in commercial lithium-ion batteries, it can no longer meet the development needs of related industries. new anode materials. A large number of studies have shown that transition metal oxides (MO, M=Mn, Fe, Co, Ni, Cu, Zn, etc.) have become an excellent choice to replace gr...

Examples

Embodiment 1

[0028] Weigh 0.4g of sodium alginate powder and 0.4g of agar powder, add them into 40mL of deionized water, and stir at high speed in a water bath at 80°C for 40 minutes to fully dissolve them in deionized water and form a uniform viscous solution; The viscous solution was transferred to a disposable plastic cup and left to cool for 2 hours to obtain a preformed hydrogel; measure 6mL Mn(NO 3 ) 2 Solution in 60mL deionized water, weigh 0.272g ZnCl 2 Dilute the particles in 60mL of deionized water, stir to make it evenly mixed, and record it as solution A. Gently cut the disposable plastic cup, take out the preformed hydrogel, soak it in solution A for 8 hours, then wash it repeatedly with deionized water for 6 times, and finally place the sodium alginate / agar double network hydrogel on the Freeze in a low-temperature refrigerator for 12 hours and then transfer to a freeze dryer for freeze-drying for 48 hours to obtain a fluffy sodium alginate / agar double network airgel.

[0...

Embodiment 2

[0032] Weigh 0.4g of sodium alginate powder and 0.4g of agar powder, add them into 40mL of deionized water, and stir at high speed in a water bath at 80°C for 40 minutes to fully dissolve them in deionized water and form a uniform viscous solution; The viscous solution was transferred to a disposable plastic cup and left to cool for 2 hours to obtain a preformed hydrogel; measure 6mL Mn(NO 3 ) 2 Solution, weigh 0.408g ZnCl 2 Dilute the particles in 60mL of deionized water, stir to make it evenly mixed, and record it as solution A. Gently cut the disposable plastic cup, take out the preformed hydrogel, soak it in solution A for 8 hours, then wash it repeatedly with deionized water for 6 times, and finally place the sodium alginate / agar double network hydrogel on the Freeze in a low-temperature refrigerator for 12 hours and then transfer to a freeze dryer for freeze-drying for 48 hours to obtain a fluffy sodium alginate / agar double network airgel.

[0033] Put the airgel obta...

Embodiment 3

[0036] Weigh 0.4g of sodium alginate powder and 0.2g of agar powder, add them to 40mL of deionized water, and stir at high speed in a water bath at 80°C for 40 minutes to fully dissolve them in deionized water and form a uniform viscous solution; The viscous solution was transferred to a disposable plastic cup, and left to cool for 2 hours to obtain a preformed hydrogel; measure 6mL Mn(NO 3 ) 2 Solution, weigh 0.68g ZnCl 2 Dilute the particles in 60mL of deionized water, stir to make it evenly mixed, and record it as solution A. Gently cut the disposable plastic cup, take out the preformed hydrogel, soak it in solution A for 8 hours, then wash it repeatedly with deionized water for 6 times, and finally place the sodium alginate / agar double network hydrogel on the Freeze in a low-temperature refrigerator for 12 hours and then transfer to a freeze dryer for freeze-drying for 48 hours to obtain a fluffy sodium alginate / agar double network airgel.

[0037] Put the airgel obtain...

technical field

[0001] The invention relates to a method for preparing a sodium alginate-based double-network carbon airgel negative electrode material for lithium ion batteries, and belongs to the technical field of lithium ion battery negative electrode materials. Background technique

[0002] Lithium-ion battery (LIB) has the advantages of high voltage, large capacity, fast charging, long life, strong safety, and no memory effect. As a promising new energy material, it has been widely used in portable electronic products, large-scale Energy storage equipment, aerospace, electric vehicles and other fields. However, due to the low theoretical specific capacity (372mAh / g) of graphite anode materials used in commercial lithium-ion batteries, it can no longer meet the development needs of related industries. new anode materials. A large number of studies have shown that transition metal oxides (MO, M=Mn, Fe, Co, Ni, Cu, Zn, etc.) have become an excellent choice to replace gr...

Examples

Embodiment 1

[0028] Weigh 0.4g of sodium alginate powder and 0.4g of agar powder, add them into 40mL of deionized water, and stir at high speed in a water bath at 80°C for 40 minutes to fully dissolve them in deionized water and form a uniform viscous solution; The viscous solution was transferred to a disposable plastic cup and left to cool for 2 hours to obtain a preformed hydrogel; measure 6mL Mn(NO 3 ) 2 Solution in 60mL deionized water, weigh 0.272g ZnCl 2 Dilute the particles in 60mL of deionized water, stir to make it evenly mixed, and record it as solution A. Gently cut the disposable plastic cup, take out the preformed hydrogel, soak it in solution A for 8 hours, then wash it repeatedly with deionized water for 6 times, and finally place the sodium alginate / agar double network hydrogel on the Freeze in a low-temperature refrigerator for 12 hours and then transfer to a freeze dryer for freeze-drying for 48 hours to obtain a fluffy sodium alginate / agar double network airgel.

[0...

Embodiment 2

[0032] Weigh 0.4g of sodium alginate powder and 0.4g of agar powder, add them into 40mL of deionized water, and stir at high speed in a water bath at 80°C for 40 minutes to fully dissolve them in deionized water and form a uniform viscous solution; The viscous solution was transferred to a disposable plastic cup and left to cool for 2 hours to obtain a preformed hydrogel; measure 6mL Mn(NO 3 ) 2 Solution, weigh 0.408g ZnCl 2 Dilute the particles in 60mL of deionized water, stir to make it evenly mixed, and record it as solution A. Gently cut the disposable plastic cup, take out the preformed hydrogel, soak it in solution A for 8 hours, then wash it repeatedly with deionized water for 6 times, and finally place the sodium alginate / agar double network hydrogel on the Freeze in a low-temperature refrigerator for 12 hours and then transfer to a freeze dryer for freeze-drying for 48 hours to obtain a fluffy sodium alginate / agar double network airgel.

[0033] Put the airgel obta...

Embodiment 3

[0036] Weigh 0.4g of sodium alginate powder and 0.2g of agar powder, add them to 40mL of deionized water, and stir at high speed in a water bath at 80°C for 40 minutes to fully dissolve them in deionized water and form a uniform viscous solution; The viscous solution was transferred to a disposable plastic cup, and left to cool for 2 hours to obtain a preformed hydrogel; measure 6mL Mn(NO 3 ) 2 Solution, weigh 0.68g ZnCl 2 Dilute the particles in 60mL of deionized water, stir to make it evenly mixed, and record it as solution A. Gently cut the disposable plastic cup, take out the preformed hydrogel, soak it in solution A for 8 hours, then wash it repeatedly with deionized water for 6 times, and finally place the sodium alginate / agar double network hydrogel on the Freeze in a low-temperature refrigerator for 12 hours and then transfer to a freeze dryer for freeze-drying for 48 hours to obtain a fluffy sodium alginate / agar double network airgel.

[0037] Put the airgel obtain...

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