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A kind of preparation method of sodium alginate-based double network carbon airgel negative electrode material for lithium ion battery

A lithium-ion battery and sodium alginate technology, applied in battery electrodes, negative electrodes, electrical components, etc., can solve the problems of easy aggregation of particles, poor conductivity, volume expansion, etc., and achieve the effect of alleviating easy aggregation

Active Publication Date: 2022-05-27
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when metal oxides are used as anode materials for lithium batteries, due to their poor electrical conductivity and easy aggregation of particles, serious volume expansion will occur during lithiation, which greatly limits the electrochemical performance of lithium batteries. This problem can usually be improved by compounding it with carbon materials

Method used

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  • A kind of preparation method of sodium alginate-based double network carbon airgel negative electrode material for lithium ion battery
  • A kind of preparation method of sodium alginate-based double network carbon airgel negative electrode material for lithium ion battery
  • A kind of preparation method of sodium alginate-based double network carbon airgel negative electrode material for lithium ion battery

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Experimental program
Comparison scheme
Effect test

Embodiment 1

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

Embodiment 2

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

[00...

Embodiment 3

[0036] Weigh 0.4 g of sodium alginate powder and 0.2 g of agar powder, add them to 40 mL of deionized water, and stir at a 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 obtained The viscous solution was transferred to a disposable plastic cup, and left to cool for 2 hours to obtain a preformed hydrogel; measure 6 mL of Mn (NO 3 ) 2 Solution, weigh 0.68g ZnCl 2 The particles were mixed in 60 mL of deionized water and stirred to be uniform, and recorded as solution A. Gently cut the disposable plastic cup, take out the preformed hydrogel, soak it in solution A for 8 hours, then repeat washing with deionized water for 6 times, and finally put the sodium alginate / agar double network hydrogel into the solution. Freeze in a low temperature refrigerator for 12 hours and then transfer to a freeze dryer for freeze drying for 48 hours to obtain fluffy sodium alginate / agar double network aerogels.

...

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Abstract

The invention discloses a method for preparing a sodium alginate-based double-network carbon airgel negative electrode material for lithium ion batteries, belonging to the technical field of lithium ion battery negative electrode materials. In this method, a certain amount of sodium alginate powder and agar powder are prepared into precursor hydrogel by sol-gel method; then Mn(NO 3 ) 2 solution, ZnCl 2 The particles are configured into a mixed solution in a certain proportion, and the precursor hydrogel is immersed in the mixed solution for 6-9 hours to obtain a double-network hydrogel; then the prepared hydrogel is washed with deionized water several times and then frozen Dry to obtain a fluffy double network airgel; finally, under the protection of an inert gas, carbonize at a high temperature to obtain a sodium alginate-based double network carbon airgel negative electrode material. The operation method of the present invention is simple and easy, the cost of the raw materials used is low, and the source is wide. When the prepared material is used for the negative electrode of the lithium ion battery, the mechanical properties, conductivity and stability in the charging and discharging process are good, and the pore structure can be maintained at the same time. It has excellent electrochemical performance.

Description

technical field [0001] The invention relates to a preparation method of a sodium alginate-based double network carbon aerogel negative electrode material for lithium ion batteries, and belongs to the technical field of negative electrode materials for lithium ion batteries. Background technique [0002] Lithium-ion batteries (LIBs) have the advantages of high voltage, large capacity, fast charging, long life, strong safety, and no memory effect. As a promising new energy material, they have been widely used in portable electronic products, large-scale Energy storage equipment, aerospace, electric vehicles and other fields. However, the graphite anode materials used in commercial lithium-ion batteries cannot meet the development needs of related industries due to their low theoretical specific capacity (372mAh / g). new anode materials. A large number of studies have shown that transition metal oxides (MO, M = Mn, Fe, Co, Ni, Cu, Zn, etc.) are excellent choices to replace gra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/60H01M4/62H01M10/0525
CPCH01M4/60H01M4/364H01M4/625H01M10/0525H01M2004/027Y02E60/10
Inventor 陈晓红梁泽前刘然申泽波孙梓喻
Owner BEIJING UNIV OF CHEM TECH
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