Application of nitrogen-poor g-C3N4 loaded Mg3N2 composite material as negative electrode material and lithium-based battery

A technology of composite materials and negative electrode materials, applied in the field of lithium-based batteries, can solve the problems of unstable cycle performance, insufficient electrical conductivity, weakened lithophilicity, etc., and achieve the effects of increasing nitrogen content, simple preparation method, and improved cycle stability.

Active Publication Date: 2022-01-21
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention aims to solve g-C 3 N 4 When applied to the negative electrode material of lithium-based batteries, due to the insufficient conductivity caused by excessive nitrogen content and the weakened lithium affinity, the technical problems of unstable cycle performance provide a nitrogen-deficient g-C 3 N 4 load Mg 3 N 2 (hereinafter abbreviated as: g-C 3 N 4-x / Mg 3 N 2 , where, 0x 3 N 2 The load is between 22wt.% to 45wt.%; the g-C 3 N 4-x / Mg 3 N 2 The preparation method of composite material comprises: raw material g-C 3 N 4 Mix with magnesium powder to get the precursor; calcinate the precursor under the protection of inert gas to get g-C 3 N 4-x / Mg 3 N 2 composite material

Method used

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  • Application of nitrogen-poor g-C3N4 loaded Mg3N2 composite material as negative electrode material and lithium-based battery
  • Application of nitrogen-poor g-C3N4 loaded Mg3N2 composite material as negative electrode material and lithium-based battery
  • Application of nitrogen-poor g-C3N4 loaded Mg3N2 composite material as negative electrode material and lithium-based battery

Examples

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Embodiment 1

[0029] This embodiment provides a nitrogen-poor g-C 3 N 4 load Mg 3 N 2 Composite material (g-C 3 N 4-x / Mg 3 N 2 , where, 0x <4), the steps include:

[0030] Step 1: Weigh a certain amount of urea into the corundum ark, and then place it in a muffle furnace for calcination at a temperature of 500°C to 700°C; in this example, calcine at 550°C for 30 minutes to obtain g-C 3 N 4 ;

[0031] Step 2: Weigh the g-C obtained in step 1 3 N 4 Mix evenly with magnesium powder at a ratio of 2:1 to 1:3 to obtain a precursor, by adjusting g-C 3 N 4 With the ratio of magnesium powder, different Mg can be obtained 3 N 2 The composite material of content; In this embodiment, g-C 3 N 4 Mix with magnesium powder in a mixer for 20-60 minutes according to the ratio of 2:1, 1:1 and 1:3 to obtain the precursor. Among them, the average particle size of magnesium powder is preferably between 500-1000nm to achieve uniform mix;

[0032] Step 3: Put the precursor obtained in step 2 in a ...

Embodiment 2

[0039] This embodiment provides a kind of g-C of the present invention 3 N 4-x / Mg 3 N 2 Composite material is used as the negative electrode sheet of negative electrode material, and its preparation method comprises:

[0040] g-C of the present invention 3 N 4-x / Mg 3 N 2 Uniformly mix with conductive agent, binder and nitrogen methyl pyrrolidone to obtain slurry; pull the slurry on the current collector by scraping, and keep the temperature at 60~100°C for 6~12h . After cooling, pole pieces are obtained.

[0041] In this example, weigh a certain amount of g-C obtained in Example 1 3 N 4 load Mg 3 N 2 For the composite material, mix it with super-P and PVDF (polyvinylidene fluoride) according to the mass ratio of 8:1:1, and use NMP (nitromethylpyrrolidone) as the solvent to uniformly mix it into a slurry; use a scraper on the copper foil After drawing the film on top, put it in a vacuum oven at 80°C for drying; after cooling, cut the pole piece into a disk pole p...

Embodiment 3

[0043] The present embodiment provides the nitrogen-poor g-C containing the present invention 3 N 4 load Mg 3 N 2 Composite batteries, and testing the nitrogen-depleted g-C of the present invention 3 N 4 load Mg 3 N 2 Electrochemical performance of composite materials as anode materials. The specific implementation is as follows: assemble the 6mm disc pole piece obtained in Example 2 and the metal lithium piece into a 2032 button battery, conduct a constant current charge and discharge test, observe the cycle stability, the pure copper foil electrode and the g-C 3 N 4 electrode as a comparative example.

[0044] Figure 7 Different contents of g-C are given 3 N 4-x / Mg 3 N 2 Lithium metal deposition / extraction coulombic efficiency diagram, it can be seen that g-C 3 N 4-x / Mg 3 N 2 -34.3 showed the best cycle stability, after 700 cycles, the Coulombic efficiency is still close to 100%, g-C 3 N 4-x / Mg 3 N 2 -22.5 The battery fails at around 450 cycles, whil...

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Abstract

The invention discloses application of a nitrogen-poor g-C3N4 loaded Mg3N2 composite material as a negative electrode material and a lithium-based battery, wherein the loading capacity of Mg3N2 in the nitrogen-poor g-C3N4 loaded Mg3N2 composite material is between 22 wt.% and 45 wt.%. The preparation method of the nitrogen-poor g-C3N4 loaded Mg3N2 composite material comprises the following steps: mixing a raw material g-C3N4 with magnesium powder to obtain a precursor; and calcining the precursor under the protection of inert gas to obtain the nitrogen-poor g-C3N4 loaded Mg3N2 composite material. According to the invention, based on the synergistic effect of Mg3N2 and graphene-shaped nitrogen-deficient g-C3N4, the graphene-shaped nitrogen-deficient g-C3N4 loaded Mg3N2 battery negative electrode material enables nucleation overpotential during lithium metal deposition to be remarkably reduced, the cycling stability is remarkably improved, and the graphene-shaped nitrogen-deficient g-C3N4 loaded Mg3N2 battery negative electrode material has potential application prospects in the technical field of lithium metal batteries.

Description

technical field [0001] The invention relates to the technical field of negative electrode materials for lithium-based batteries, in particular to a nitrogen-poor g-C 3 N 4 load Mg 3 N 2 Use of the composite material as an anode material and a lithium-based battery. Background technique [0002] Traditional lithium-ion batteries based on graphite as the negative electrode and metal oxide as the positive electrode are approaching their energy storage limit and cannot meet people's demand for energy storage devices with high energy density and high power density. Lithium metal has a very high specific capacity (3860mAh g −1 ) is considered to be the ultimate choice for the anode of Li-ion batteries. However, problems such as the easy generation of lithium dendrites during the cycle (deposition / removal) process of lithium metal have become the main obstacles limiting the development of lithium metal anodes. [0003] The use of lithium-friendly materials to guide the stable...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/587H01M4/136H01M10/0525B82Y30/00
CPCH01M4/624H01M4/628H01M4/587H01M4/136H01M10/0525B82Y30/00H01M2004/027H01M2004/021Y02E60/10
Inventor 张江江崔世强余臻伟
Owner BEIHANG UNIV
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