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Metal lithium negative electrode for in-situ construction of multifunctional biomimetic membrane and preparation method of metal lithium negative electrode

A biomimetic membrane, multi-functional technology, applied in electrode manufacturing, battery electrodes, lithium batteries, etc., can solve the problem of safety performance and electrochemical cycle performance that cannot meet high energy density batteries, loss of active positive active materials, and surface blockage of metal lithium negative electrodes. and other problems, to achieve the effect of promoting uniform deposition, improving cycle stability, and reducing local current density

Active Publication Date: 2021-03-23
SICHUAN PANOVASIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the existing research work has modified the metallic lithium anode to improve the growth of lithium dendrites, volume expansion, and the formation of "dead lithium" to a certain extent, it still cannot meet the needs of current high-energy-density batteries. Requirements for safety performance and electrochemical cycle performance
In addition, there is still no better way to avoid oxidation in air due to the high reactivity of lithium metal
At the same time, in the battery system, the positive electrode intermediate enters the impurities on the surface of the negative electrode material through the separator, which will lead to the loss of the active positive electrode active material and the blockage of the metal lithium negative electrode surface. At present, this problem has not been well resolved.

Method used

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  • Metal lithium negative electrode for in-situ construction of multifunctional biomimetic membrane and preparation method of metal lithium negative electrode
  • Metal lithium negative electrode for in-situ construction of multifunctional biomimetic membrane and preparation method of metal lithium negative electrode
  • Metal lithium negative electrode for in-situ construction of multifunctional biomimetic membrane and preparation method of metal lithium negative electrode

Examples

Experimental program
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Effect test

Embodiment 1

[0029] First, select straw as biomass material, and carbonize it under inert gas at 400°C for 3 hours to obtain porous biomass carbon; add concentrated sulfuric acid to introduce acidic active groups of sulfonic acid groups, filter, wash, and dry to obtain a mixture of biomass with sulfonic acid groups Carbon material; in the mixture of mixed carbon material and polyvinylidene fluoride resin film with a mass ratio of 7:3, add N-methylpyrrolidone corresponding to 20% of the resin film and stir to make it fully mixed. Then add a volatile non-corresponding solvent tetrahydrofuran, the content of which is 1%-50% relative to the mass of the solvent; then use wet spinning to carry out in-situ electrospinning of the mixture on the surface of metal lithium to obtain a biomimetic biomass with uniform structure Membrane, the spinning conditions are as follows: spinning temperature is 25°C, spinning voltage is 30kV, propulsion speed is 3μL / min, spinning distance is 10cm, moisture is contr...

Embodiment 2

[0031] First, choose succulents as biomass materials, and carbonize them under inert gas at 400°C for 3 hours to obtain porous biomass carbon; add concentrated sulfuric acid to introduce acidic active groups of sulfonic acid groups, filter, wash, and dry to obtain a mixture of biomass with sulfonic acid groups Carbon material; in the mixture of mixed carbon material and polyvinylidene fluoride resin film with a mass ratio of 7:3, add N-methylpyrrolidone corresponding to 20% of the resin film and stir to make it fully mixed. Then add a volatile non-corresponding solvent tetrahydrofuran, the content of which is 10% relative to the mass of the solvent; then use wet spinning to carry out in-situ electrospinning of the mixture on the surface of metal lithium to obtain a biomimetic membrane of biomass with uniform structure. The spinning conditions are as follows: the spinning temperature is 25°C, the spinning voltage is 30kV, the propulsion speed is 3μL / min, the spinning distance is...

Embodiment 3

[0033]First, corncobs are selected as biomass material, and carbonized under inert gas at 400°C for 3 hours to obtain porous biomass carbon; adding concentrated sulfuric acid to introduce acidic active groups of sulfonic acid groups, suction filtration, washing, and drying to obtain biomass with sulfonic acid groups Mixed carbon material; in the mixture of mixed carbon material and polyvinylidene fluoride resin film with a mass ratio of 7:3, add N-methylpyrrolidone corresponding to 20% of the resin film and stir to make it fully mixed. Then add a volatile non-corresponding solvent tetrahydrofuran, the content of which is 20% relative to the mass of the solvent; then use wet spinning to carry out in-situ electrospinning of the mixture on the surface of metal lithium to obtain a biomimetic membrane of biomass with uniform structure. The spinning conditions are as follows: the spinning temperature is 25°C, the spinning voltage is 25kV, the propulsion speed is 3μL / min, the spinning...

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Abstract

The invention discloses a metal lithium negative electrode for in-situ construction of a multifunctional biomimetic membrane and a preparation method of the metal lithium negative electrode. The preparation method comprises the following steps of carbonizing a biomass material to obtain biomass carbon, and then introducing an acidic active group to obtain a mixed carbon material, adding the mixedcarbon material and the resin film into a first solvent, and fully mixing to obtain a first mixed solution, adding a second solvent into the first mixed solution and uniformly mixing to obtain a second mixed solution, performing in-situ electrostatic spinning on the second mixed solution on the surface of metal lithium by adopting wet spinning to obtain a biomass biomimetic membrane with a uniformstructure, coating the surface of the biomass biomimetic membrane with a layer of pore-closing agent, and conducting curing processing. Therefore, the biomass composite membrane with controllable distribution and size can induce uniform deposition of lithium ions, reduce the surface current density and inhibit growth of lithium dendrites, so that the cycling stability of the whole electrode material is remarkably improved.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a metal lithium negative electrode for in-situ construction of a multifunctional bionic membrane and a preparation method thereof. Background technique [0002] In recent years, with the gradual expansion of the demand for power batteries in terms of energy density and safety, lithium-ion batteries have become a research hotspot for Chinese researchers and research institutions in enterprises and institutions, especially for high-energy-density lithium-ion batteries. Numerous studies. Due to the extremely high theoretical specific capacity (3860mAh g -1 ) and extremely negative potential (-3.040V vs standard hydrogen electrode), it is finally determined that the use of metal lithium anode materials in the battery system is a better choice. In order to obtain a battery pack with high energy density, the matching cathode materials are mainly concentrated on high-capacit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/38H01M4/62H01M4/66H01M10/052H01M10/42
CPCH01M4/0402H01M4/382H01M4/62H01M4/667H01M10/052H01M10/4235Y02E60/10
Inventor 高剑邓云龙罗从山王铭
Owner SICHUAN PANOVASIC TECH
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