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Copper tin alloy-based three-dimensional copper tin compound nanoparticle-microporous copper lithium ion battery cathode and one-step preparation method

A lithium-ion battery, nanoparticle technology, applied in nanotechnology for materials and surface science, battery electrodes, active material electrodes, etc. problems, to achieve the effect of reducing production costs, buffering volume expansion, and fully contacting

Active Publication Date: 2019-03-26
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, due to the serious volume effect of tin anode materials, it has not yet achieved large-scale commercial use.
The volume effect of metal tin will cause the active material to break and fall off quickly, resulting in rapid electrode failure, which greatly limits the promotion and application of tin as a negative electrode material for lithium-ion batteries

Method used

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  • Copper tin alloy-based three-dimensional copper tin compound nanoparticle-microporous copper lithium ion battery cathode and one-step preparation method
  • Copper tin alloy-based three-dimensional copper tin compound nanoparticle-microporous copper lithium ion battery cathode and one-step preparation method
  • Copper tin alloy-based three-dimensional copper tin compound nanoparticle-microporous copper lithium ion battery cathode and one-step preparation method

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Experimental program
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Effect test

Embodiment 1

[0037] In this embodiment, a three-dimensional Cu based on copper-tin alloy is provided 6 sn 5 The one-step preparation method of nanoparticle-microporous copper lithium ion battery negative pole, concrete steps are as follows:

[0038] (1) Weigh the copper block and the tin block according to the atomic percentage of copper and tin being 35:65, and melt them in a muffle furnace to obtain a copper-tin alloy ingot. The scanning electron microscope photos of the surface of copper-tin alloy ingot are as follows: figure 1 Shown in (A), the EDS spectrum of the copper-tin alloy ingot is as follows figure 1 (B) shown.

[0039] (2) The copper-tin alloy ingot is cut into a copper-tin alloy sheet with a thickness of 400 μm with a wire cutting machine, and the surface of the copper-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 embodiment, a three-dimensional Cu based on copper-tin alloy is provided 3 Sn / Cu 6 sn 5 The one-step preparation method of nanoparticle-microporous copper lithium ion battery negative pole, concrete steps are as follows:

[0047] (1) Weigh the copper block and the tin block according to the atomic percentage of copper and tin being 75.5:24.5, and melt them in a muffle furnace to obtain a copper-tin alloy ingot.

[0048] (2) The copper-tin alloy ingot is cut into a copper-tin alloy sheet with a thickness of 250 μm with a wire cutting machine, and the surface of the copper-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 copper-tin alloy sheet is cleaned with deionized water.

[0049] Place the cleaned copper-tin alloy sheet in a mixed solution of hydrofluoric acid, nitric acid and hydrochloric ac...

Embodiment 3

[0052] In this embodiment, a three-dimensional Cu based on copper-tin alloy is provided 3 Sn / Cu 6 sn 5 The one-step preparation method of nanoparticle-microporous copper lithium ion battery negative pole, concrete steps are as follows:

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

[0054] (2) The copper-tin alloy ingot is cut into a copper-tin alloy sheet with a thickness of 450 μm with a wire cutting machine, and the surface of the copper-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 copper-tin alloy sheet is cleaned with deionized water.

[0055] Place the cleaned copper-tin alloy sheet in a mixed solution of hydrofluoric acid, nitric acid and hydrochloric acid f...

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Abstract

The invention provides a copper tin alloy-based three-dimensional copper tin compound nanoparticle-microporous copper lithium ion battery cathode and a one-step preparation method. The lithium ion battery cathode is composed of a three-dimensional microporous copper framework with porous walls / pore orientation and copper tin compound nanoparticles. The copper tin compound nanoparticles are Cu6Sn5nanoparticles or mixed particles of Cu6Sn5 nanoparticles and Cu3Sn nanoparticles. The copper tin compound nanoparticles are dispersed and embedded in pore structures of the three-dimensional microporous copper framework with porous walls / pore orientation to form a nanoporous structure so as to finally form a double continuous opened micro-nano graded porous structure. The lithium ion battery cathode provided by the invention can alleviate huge volume change generated in circular lithium embedding and removing processes of the tin cathode material, so that the cyclic performance of the tin cathode is improved.

Description

technical field [0001] The invention belongs to the field of negative poles of lithium ion batteries, and relates to three-dimensional copper-tin compound nanoparticles based on copper-tin alloys-microporous copper lithium ion battery negative poles and a one-step preparation method thereof. Background technique [0002] With the increasing requirements for battery performance in portable mobile devices such as mobile phones, power banks and notebook computers, electric vehicles, hybrid vehicles and smart grid storage devices, the demand for batteries with high specific energy, long life and good safety has become increasingly more and more prominent. 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. As we all know, the performance of lithium-ion batteries mainly depends on the positive and negative electrode materials, so the develo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/134H01M4/1395H01M4/38H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/134H01M4/1395H01M4/387H01M4/628H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 刘文博董鑫向鹏颜家振李宁
Owner SICHUAN UNIV
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