Lithium-philic heteroatom and metal oxide co-doped three-dimensional fiber frame lithium battery negative electrode and preparation

A technology of heteroatoms and oxides, applied in the field of energy storage devices, can solve problems such as lithium dendrite growth, and achieve the effect of avoiding lithium dendrites and improving long-cycle stability and safety.

Active Publication Date: 2020-01-17
BEIJING UNIV OF CHEM TECH
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Problems solved by technology

[0006] In order to better meet the needs of social development for stable and safe secondary rechargeable lithium batteries, the present invention provides a design and preparation method of a three-dimensional fiber frame lithium battery negative electrode co-doped with lithium-philic heteroatoms and metal oxides and the resulting Lithium negative electrode to solve the problem of lithium dendrite generation and growth in lithium negative electrode during battery cycle

Method used

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  • Lithium-philic heteroatom and metal oxide co-doped three-dimensional fiber frame lithium battery negative electrode and preparation

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Embodiment 1

[0035] (1) Preparation of stable and safe lithium anode

[0036] Accurately weigh out 5.0g of gelatin and dissolve it in 45.0g of solvent (the mass ratio of water to trifluoroethanol is 1:1), then divide the solvent into two parts, and add 0.356g of acetic acid dihydrate to one part. Zinc, add 0.136g lithium hydroxide monohydrate to the other portion, and after stirring uniformly, add the solution containing lithium hydroxide monohydrate to the solution containing zinc acetate dihydrate dropwise and stir while adding dropwise. The total reaction time is half an hour. Afterwards, it is spun into a fiber film on copper foil using an electrospinning machine (the film thickness is 0.02mm). The technical parameters of electrospinning in step (2) are: advancement amount 0.01mL / min, translation speed 0.08cm / min . Let it stand at room temperature for 24 hours.

[0037] The above modified copper foil is heated in a tube furnace filled with nitrogen. The temperature range of the heating pr...

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Abstract

The invention discloses a lithium-philic heteroatom and metal oxide co-doped three-dimensional fiber frame lithium battery negative electrode and preparation, and belongs to the technical field of lithium battery negative electrodes. The preparation method specifically comprises the following steps of synthesizing zinc hydroxide in a gelatin solution to form uniformly dispersed turbid liquid; spinning the turbid liquid on the surface of a copper foil by utilizing an electrostatic spinning technology to form an electrostatic spinning fiber membrane, and then standing at room temperature to volatilize the solvent completely to form the copper foil with a gelatin spinning membrane; heating to convert zinc hydroxide into zinc oxide; assembling the modified copper foil and a metal lithium sheetinto a button cell, standing for 10 hours, and depositing metal lithium on the modified copper foil by using an electrochemical deposition method; and disassembling the button cell and taking out thecopper foil to obtain the required metal lithium negative electrode, so that the generation and growth problems of lithium dendrites of the lithium negative electrode during the battery cycle processare solved, and the lithium negative electrode has the excellent cycle stability.

Description

Technical field [0001] The invention relates to a method for designing and preparing a three-dimensional fiber frame lithium battery negative electrode co-doped with a lithium-philic heteroatom and a metal oxide and the obtained lithium negative electrode, belonging to the field of energy storage devices and energy materials. Background technique [0002] New types of renewable energy, such as the use of water energy, solar energy, etc., the gradual marketization of electric vehicles, and the rapid development of various portable devices require efficient and practical energy storage and transportation systems, but for the new "green" energy storage While the device is concerned about its "greenness", the key to determining whether it is suitable for industrial applications is whether it has important indicators such as high power density and high energy density. New power systems, especially secondary batteries, are currently important "green" energy storage devices. [0003] Sin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1395H01M4/134H01M4/04H01M10/052
CPCH01M4/0438H01M4/134H01M4/1395H01M10/052H01M2004/027Y02E60/10
Inventor 黄雅钦孙小刚李承明
Owner BEIJING UNIV OF CHEM TECH
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