A preparation method of lithium metal negative electrode based on lithium-philic three-dimensional carbon-based current collector

A lithium metal negative electrode and current collector technology, which is applied in the field of lithium metal battery negative electrode and its preparation based on lithium-philic three-dimensional carbon-based current collectors, can solve the problems that metal lithium cannot infiltrate the skeleton, poor lithium affinity, etc. Crystal growth, high lithium content, and the effect of alleviating the volume expansion effect

Active Publication Date: 2022-06-21
BEIHANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most carbon-based current collectors have poor lithium affinity, and metal lithium cannot infiltrate the framework quickly and uniformly.

Method used

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  • A preparation method of lithium metal negative electrode based on lithium-philic three-dimensional carbon-based current collector
  • A preparation method of lithium metal negative electrode based on lithium-philic three-dimensional carbon-based current collector
  • A preparation method of lithium metal negative electrode based on lithium-philic three-dimensional carbon-based current collector

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Experimental program
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Effect test

Embodiment 1

[0026] 1) Preparation of 3D precursor framework materials

[0027] By TEMPO oxidation method, an aqueous solution of bacterial cellulose with good dispersibility was prepared with a concentration of 2 mg / ml; 50 ml of bacterial cellulose aqueous solution, 0.55 g of resorcinol, and 0.75 ml of formaldehyde were added to a beaker, and the mixture was stirred evenly. into the reaction kettle, heated at 100 degrees Celsius for 10 hours, and freeze-dried the precursor skeleton material obtained;

[0028] 2) Preparation of lithiophilic three-dimensional carbon-based current collectors

[0029] Put the precursor skeleton material into a tube furnace, pass nitrogen protective gas, and conduct high-temperature carbonization at a constant temperature of 800 ° C for 2 hours to obtain a lithiophilic three-dimensional carbon-based current collector;

[0030] 3) Preparation of composite lithium metal anode

[0031] The lithiophilic three-dimensional carbon-based current collector is put int...

Embodiment 2

[0034] 1) Preparation of 3D precursor framework materials

[0035] Add 50ml of carbon nanotube aqueous solution, 0.275g of resorcinol, and 0.375ml of formaldehyde to the beaker, stir evenly, put the mixed solution into the reaction kettle, heat it at 100 degrees Celsius for 10 hours, and freeze-dry the precursor skeleton material obtained ;

[0036] 2) Preparation of lithiophilic three-dimensional carbon-based current collectors

[0037] Put the precursor skeleton material into a tube furnace, pass nitrogen protective gas, and conduct high-temperature carbonization at a constant temperature of 800 ° C for 2 hours to obtain a lithiophilic three-dimensional carbon-based current collector;

[0038] 3) Preparation of composite lithium metal anode

[0039] The lithiophilic three-dimensional carbon-based current collector is put into molten lithium metal at 300 °C in a glove box, and the liquid metal lithium can be poured into the current collector by itself. After taking out and ...

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Abstract

The invention belongs to the technical field of lithium metal batteries, and discloses a method for preparing a lithium metal negative electrode of a lithium-friendly three-dimensional carbon-based current collector, comprising the steps of: first self-assembling a one-dimensional nanometer material and an organic material to obtain a three-dimensional precursor framework material; Then, the three-dimensional precursor framework material is subjected to high-temperature carbonization treatment to prepare a lithium-friendly three-dimensional carbon-based current collector with good wettability to liquid metal lithium; the metal lithium is heated to 180°C to 500°C to obtain liquid metal lithium, and the liquid metal Lithium is mixed with a lithium-friendly three-dimensional carbon-based current collector, and after being fully infiltrated by liquid metal lithium, it is naturally cooled to form a composite lithium metal negative electrode. Compared with the lithium sheet negative electrode, the composite lithium metal negative electrode prepared by the present invention can greatly inhibit the growth of lithium dendrites, relieve the volume expansion effect of the lithium negative electrode during the deposition / stripping process, and realize the long life and high stability of lithium metal cycle.

Description

technical field [0001] The invention belongs to the technical field of lithium metal batteries, and particularly relates to a lithium metal battery negative electrode based on a lithiophilic three-dimensional carbon-based current collector and a preparation method thereof. Background technique [0002] Due to its high theoretical capacity (3860mAh / g) and low electrochemical potential (-3.04V), metallic lithium is considered to be the most promising anode material for high energy density storage systems, such as lithium-air batteries, lithium-sulfur batteries . However, the lithium anode has not been able to obtain large-scale commercial application so far, mainly due to the following two reasons: the infinitely larger relative volume leads to cracks at the solid-state electrolyte interface (SEI); Controlled growth leads to low coulombic efficiency, poor cycle stability, and serious safety hazards. [0003] To address these issues, researchers generally employ three strateg...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/1395H01M4/78H01M4/66H01M4/38H01M10/052
CPCH01M4/1395H01M4/663H01M4/78H01M4/382H01M10/052H01M2004/027H01M2004/021Y02E60/10
Inventor 郉雅兰熊刚毅张世超
Owner BEIHANG UNIV
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