Lithium-philic carbon skeleton composite material as well as preparation method and application thereof

A composite material and carbon skeleton technology, applied in the direction of lithium batteries, structural parts, electrical components, etc., can solve the problems of not being able to effectively attract lithium metal, and achieve the effects of easy scale-up production, reducing impact, and avoiding excessive coating

Active Publication Date: 2022-04-12
BEIJING WELION NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Carbon materials are easy to prepare large specific surface area and porous structure, but carbon materials are generally lithium-phobic, which cannot effectively attract lithium metal, and at the same time, in the case of less pore structure, cannot provide enough space for the deposition of lithium metal

Method used

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  • Lithium-philic carbon skeleton composite material as well as preparation method and application thereof
  • Lithium-philic carbon skeleton composite material as well as preparation method and application thereof
  • Lithium-philic carbon skeleton composite material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0088] Mix 125g VGCF, 125g ZnO and 2250g deionized water, stir and sonicate until uniformly dispersed, then transfer the slurry with a total solid content of 10% to a sand mill, and sand mill for crushing and dispersing; use spray drying with a flow rate of 1000mL / h, temperature 160°C, air pressure 0.4Mpa, spray to obtain carbon microsphere material.

[0089] The obtained carbon microspheres were sintered, and the sintering conditions were: 5°C / min from room temperature to 300°C, holding for 2 hours, 2°C / min to 800°C, holding for 3 hours, and finally cooling down to room temperature to obtain the precursor material.

[0090] Next, in-situ liquid-phase coating is carried out on the precursor material. Dissolve 2.6g tris (trishydroxymethylaminomethane) in 1000ml deionized water, then add 100g precursor material to the above solution, and disperse evenly after magnetic stirring Add 10g of dopamine hydrochloride to the mixed solution for coating, the coating time is 24h, and the ...

Embodiment 2

[0094] Mix 125g VGCF, 125g ZnO and 2250g deionized water, stir and sonicate until uniformly dispersed, then transfer the slurry with a total solid content of 10% to a sand mill, and sand mill for crushing and dispersing; use spray drying with a flow rate of 1000mL / h, temperature 160°C, air pressure 0.4Mpa, spray to obtain carbon microsphere material.

[0095] Sinter the obtained carbon microspheres, sintering conditions: 5°C / min from room temperature to 300°C, heat preservation for 2 hours, 2°C / min temperature rise to 800°C, heat preservation for 3 hours, and finally cool down to room temperature to obtain a lithium-philic carbon skeleton composite material .

[0096] In the resulting lithiophilic carbon framework composite, the specific surface area is 167m 2 / g; tap density is 0.3g / cm 3 . Such as figure 2 As shown, the obtained lithium-philic carbon skeleton composite material has no coating layer and is only a spherical structure, and the structure contains lithium-ph...

Embodiment 3

[0098] Mix 75g VGCF, 50g conductive graphene, 100g nano-Ag powder, 25g ZnO and 2250g deionized water, stir and sonicate until uniformly dispersed, transfer the slurry with a total solid content of 10% to a sand mill, and perform the same as other steps Example 1 is the same.

[0099] The structure of the obtained lithium-philic carbon framework composite is as follows: image 3 As shown, it has a two-layer structure, the cladding layer is the outermost layer, covering the three-dimensional network structure, and the lithium-friendly material is located in the through hole in the three-dimensional network structure. Provide more space. In the obtained lithium-philic carbon framework composite: the specific surface area is 52m 2 / g; tap density is 0.3g / cm 3 .

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Abstract

The invention relates to a lithium-loving carbon skeleton composite material which comprises a three-dimensional network structure, and the three-dimensional network structure layer contains a lithium-loving material. The lithium-loving material is distributed in the through holes of the three-dimensional network structure; the three-dimensional network structure layer is a carbon skeleton formed by graphitizing a fibrous carbon nanomaterial. According to the lithium-loving carbon skeleton composite material, nucleation overpotential can be reduced, lithium deposition sites can be optimized, lithium metal can be attracted to be deposited in a three-dimensional structure network, volume expansion of metal lithium and generation of lithium dendrites in the circulation process are avoided, contact between an electrolyte and the lithium metal is isolated, side reactions are reduced, and the circulation performance of the material is optimized.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a lithium-philic carbon skeleton composite material and a preparation method and application thereof. Background technique [0002] Due to the characteristics of high energy density and long life, lithium battery is a new type of efficient and clean green energy. However, during the charging process of the lithium metal negative electrode, "lithium dendrites" will appear, which will affect the electrical performance of the battery. The prior art shows that a framework with a certain mesoporous structure can inhibit the growth and volume change of lithium dendrites, and then support lithium metal through the deposition of lithium metal for use in lithium batteries. [0003] However, the wettability between carbon nanotubes and lithium metal is poor, and no lithium-friendly material is loaded inside the microspheres, which will lead to direct deposition of lithium metal on the s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/38H01M4/134H01M10/052
CPCY02E60/10
Inventor 王胜彬张臻刘东崛俞会根
Owner BEIJING WELION NEW ENERGY TECH CO LTD
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