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Three-dimensional micro-nano composite porous iron tin-iron tin nitrogen compound integrated lithium ion battery negative electrode and one-step preparation method thereof

A lithium-ion battery and tin compound technology, applied in battery electrodes, active material electrodes, negative electrodes, etc., can solve the problems of restricting the popularization and application of tin, tin powdering and peeling, large internal stress, etc., and achieve improved cycle performance and rate performance , to avoid falling off, the effect of large specific surface area

Active Publication Date: 2021-02-05
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although tin has the above advantages, when tin alloy is used as the negative electrode material of lithium-ion batteries, a huge volume change will occur during the process of lithium ion intercalation, resulting in large internal stress, which will cause tin to powder and peel off from the base material. This leads to rapid failure of the electrode, which greatly limits the popularization and application of tin as the negative electrode material of lithium-ion batteries.

Method used

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  • Three-dimensional micro-nano composite porous iron tin-iron tin nitrogen compound integrated lithium ion battery negative electrode and one-step preparation method thereof
  • Three-dimensional micro-nano composite porous iron tin-iron tin nitrogen compound integrated lithium ion battery negative electrode and one-step preparation method thereof
  • Three-dimensional micro-nano composite porous iron tin-iron tin nitrogen compound integrated lithium ion battery negative electrode and one-step preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] In this example, a three-dimensional micro-nano composite porous FeSn-Fe 3 SnN integrated lithium ion battery negative electrode and one-step preparation method thereof, specifically as follows:

[0038] (1) Weigh the iron block and the tin block according to the ratio of the atomic percentage of iron and tin being 70:30, and melt them in a muffle furnace to obtain an iron-tin alloy ingot. The scanning electron microscope photos of the surface of the iron-tin alloy ingot are as follows: figure 1 As shown in the (A) figure, the EDS spectrum of the iron-tin alloy ingot is as follows figure 1 As shown in (B) figure.

[0039] (2) The iron-tin alloy ingot is cut into iron-tin alloy sheets with a thickness of 500 μm with a wire cutting machine, and the surface of the iron-tin alloy sheet is polished with 380 mesh, 800 mesh, 1200 mesh, and 2000 mesh water sandpaper successively, and then The diamond polishing paste with a particle size of 0.5 μm is used for polishing, and t...

Embodiment 2

[0046] In this example, a three-dimensional micro-nano composite porous FeSn-Fe 3 SnN integrated lithium ion battery negative electrode and one-step preparation method thereof, specifically as follows:

[0047] (1) Weigh the iron block and the tin block according to the ratio of the iron to tin atomic percentage of 60:40, and melt them in a muffle furnace to obtain an iron-tin alloy ingot.

[0048] (2) The iron-tin alloy ingot is cut into iron-tin alloy sheets with a thickness of 500 μm with a wire cutting machine, and the surface of the iron-tin alloy sheet is polished with 380 mesh, 800 mesh, 1200 mesh, and 2000 mesh water sandpaper successively, and then The diamond polishing paste with a particle size of 0.5 μm is used for polishing, and the polished iron-tin alloy sheet is cleaned with deionized water and dried.

[0049] (3) The iron-tin alloy sheet is placed in a corrosion solution composed of hydrofluoric acid and nitric acid for corrosion, in the corrosion solution, t...

Embodiment 3

[0052]In this example, a three-dimensional micro-nano composite porous FeSn-Fe 3 SnN integrated lithium ion battery negative electrode and one-step preparation method thereof, specifically as follows:

[0053] (1) Weigh the iron block and the tin block according to the ratio of the atomic percentage of iron to tin being 45:55, and melt them in a muffle furnace to obtain an iron-tin alloy ingot.

[0054] (2) The iron-tin alloy ingot is cut into iron-tin alloy sheets with a thickness of 500 μm with a wire cutting machine, and the surface of the iron-tin alloy sheet is polished with 380 mesh, 800 mesh, 1200 mesh, and 2000 mesh water sandpaper successively, and then The diamond polishing paste with a particle size of 0.5 μm is used for polishing, and the polished iron-tin alloy sheet is cleaned with deionized water and dried.

[0055] (3) The iron-tin alloy sheet is placed in a corrosion solution composed of hydrofluoric acid and nitric acid for corrosion, in the corrosion soluti...

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Abstract

The invention provides a three-dimensional micro-nano composite porous iron-tin-iron-tin-nitrogen compound integrated lithium ion battery negative electrode and a one-step preparation method thereof.The lithium ion battery negative electrode is composed of an iron-tin compound and an iron-tin-nitrogen compound, wherein the iron-tin compound is single FeSn or FeSn / FeSn2, and the iron-tin-nitrogencompound is Fe3SnN; the lithium ion battery negative electrode has a bicontinuous open-pore three-dimensional micron-nano composite hierarchical pore structure, and the nano pore structure is distributed on a three-dimensional micron-porous skeleton formed by an iron-tin compound and an iron-tin-nitrogen compound. According to the invention, the huge volume change of the tin negative electrode material in the cyclic lithium intercalation and deintercalation process can be relieved, and the cycle performance and specific capacity of the tin negative electrode of the lithium ion battery are improved.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery negative poles, and relates to a three-dimensional micro-nano composite porous iron-tin-iron-tin-nitrogen compound integrated lithium-ion battery negative pole and a one-step preparation method thereof. Background technique [0002] Since the 21st century, with the continuous advancement of electronic technology and the continuous development of the green energy industry, portable mobile devices, electric vehicles, hybrid vehicles and smart grid storage devices have increasingly required battery performance. The demand for batteries with good life and safety is becoming more and more urgent. Lithium-ion batteries have the advantages of high open circuit voltage, high energy density and long life, and are considered to be the first choice for the next generation of power batteries. The performance of lithium-ion batteries mainly depends on the positive and negative electrode materials. Therefore...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/134H01M4/136H01M4/38H01M4/58H01M4/1395H01M4/1397H01M10/0525
CPCH01M4/134H01M4/136H01M4/1395H01M4/1397H01M4/387H01M4/58H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 刘文博饶雪兰向鹏颜家振李宁
Owner SICHUAN UNIV
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