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Nickel-tin alloy-based three-dimensional tin oxide nanoparticle-micron porous nickel-tin compound lithium ion battery anode and preparation method thereof

A lithium-ion battery and nanoparticle technology, which is applied in nanotechnology for materials and surface science, battery electrodes, active material electrodes, etc., can solve the problems of large irreversible capacity, low reversible specific capacity, shedding, etc., and achieve multi-embedded Lithium active sites, increased specific surface area, full contact effect

Active Publication Date: 2020-05-22
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although some progress has been made in the field of portable electronics, there are still two main problems to be solved in the charge and discharge process of tin-based anode materials: (1) the first irreversible capacity is large, and the reversible specific capacity is low, and the practical application has been limited. (2) The large volume change causes the pulverization and shedding of active materials, resulting in poor cycle life of lithium-ion batteries
Even the current state-of-the-art Sn-M alloy anode, its performance still cannot meet the requirements of advanced lithium-ion batteries in the field of electric vehicles

Method used

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  • Nickel-tin alloy-based three-dimensional tin oxide nanoparticle-micron porous nickel-tin compound lithium ion battery anode and preparation method thereof
  • Nickel-tin alloy-based three-dimensional tin oxide nanoparticle-micron porous nickel-tin compound lithium ion battery anode and preparation method thereof
  • Nickel-tin alloy-based three-dimensional tin oxide nanoparticle-micron porous nickel-tin compound lithium ion battery anode and preparation method thereof

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Embodiment 1

[0042] In this embodiment, a method for preparing a negative electrode of a nickel-tin alloy-based three-dimensional tin oxide nanoparticle-microporous nickel-tin compound lithium ion battery is provided, and the specific steps are as follows:

[0043] (1) Weigh the tin block and the nickel block according to the ratio of the atomic percentage of tin to nickel being 55:45, and melt them in a muffle furnace to obtain a nickel-tin alloy ingot. Cut the nickel-tin alloy ingot into nickel-tin alloy sheets with a thickness of 650 μm with a wire cutting machine, and then use 280 mesh, 800 mesh, 1200 mesh, and 2000 mesh water sandpaper to polish the surface of the nickel-tin alloy sheet, and then use a particle size of 0.5 μm diamond polishing paste for polishing, the polished nickel-tin alloy sheet is cleaned with deionized water and then dried. Scanning electron micrographs of nickel-tin alloy flakes are as follows: figure 1 As shown in the (A) figure, the EDS spectrum of the nicke...

Embodiment 2

[0053] In this embodiment, a method for preparing a negative electrode of a three-dimensional tin oxide nanoparticle-microporous nickel-tin compound lithium-ion battery is provided, and the specific steps are as follows:

[0054] (1) Weigh the tin block and the nickel block according to the ratio of the atomic percentage of tin to nickel being 55:45, and melt them in a muffle furnace to obtain a nickel-tin alloy ingot. Cut the nickel-tin alloy ingot into nickel-tin alloy sheets with a thickness of 650 μm with a wire cutting machine, and then use 280 mesh, 800 mesh, 1200 mesh, and 2000 mesh water sandpaper to polish the surface of the nickel-tin alloy sheet, and then use a particle size of 0.5 μm diamond polishing paste for polishing, the polished nickel-tin alloy sheet is cleaned with deionized water and then dried. Scanning electron micrographs of nickel-tin alloy flakes are as follows: figure 1 As shown in the (A) figure, the EDS spectrum of the nickel-tin alloy sheet is as...

Embodiment 3

[0070] In this embodiment, a method for preparing a negative electrode of a nickel-tin alloy-based three-dimensional tin oxide nanoparticle-microporous nickel-tin compound lithium ion battery is provided, and the specific steps are as follows:

[0071](1) Weigh the tin block and the nickel block according to the ratio of the atomic percentage of tin to nickel being 65:35, and melt them in a muffle furnace to obtain a nickel-tin alloy ingot. Cut the nickel-tin alloy ingot into nickel-tin alloy sheets with a thickness of 450 μm with a wire cutting machine, and then use 280 mesh, 800 mesh, 1200 mesh, and 2000 mesh water sandpaper to polish the surface of the nickel-tin alloy sheet, and then use a particle size of 0.5 μm diamond polishing paste for polishing, the polished nickel-tin alloy sheet is cleaned with deionized water and then dried. Scanning electron micrographs of nickel-tin alloy flakes are as follows: Figure 11 As shown in the (A) figure, the EDS spectrum of the nick...

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Abstract

The invention provides a nickel-tin alloy-based three-dimensional tin oxide nanoparticle-micron porous nickel-tin compound lithium ion battery anode, which is composed of a three-dimensional micron porous nickel-tin compound skeleton and tin oxide nanoparticles, the nickel-tin compound is Ni3Sn2, and the tin oxide is SnO2 and SnO; the tin oxide nanoparticles are formed in situ by partially oxidizing tin in a three-dimensional micron porous nickel-tin compound skeleton; the tin oxide nanoparticles are dispersed and distributed on the surface of the three-dimensional micron porous nickel-tin compound skeleton or are uniformly distributed on the surface of the three-dimensional micron porous nickel-tin compound skeleton to form a tin oxide nanoparticle layer; when the tin oxide nanoparticlesare assembled to form the tin oxide nanoparticle layer, the lithium ion battery anode has a double-connected micron-nano composite pore structure. The invention also provides a preparation method of the lithium ion battery anode. The lithium ion battery anode has relatively high specific capacity and excellent cycle performance.

Description

technical field [0001] The invention belongs to the field of negative electrodes of lithium ion batteries, and relates to a nickel-tin alloy-based tin oxide nanoparticle-microporous nickel-tin compound lithium ion battery negative electrode and a preparation method thereof. Background technique [0002] Since the 1990s, rechargeable lithium-ion batteries (LIBs) have played a central role in the energy storage industry and dominated the consumer market for portable electronic devices. However, with the rapid development of computers, Internet, communications and consumer electronics, increasing informatization and increasingly serious environmental problems, modern society has put forward more stringent requirements for rechargeable lithium-ion batteries, hoping to develop rechargeable lithium-ion batteries. The continuous development of lithium-ion batteries requires high energy / power density, long cycle life, and environmental protection. [0003] Carbon materials have dis...

Claims

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Application Information

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IPC IPC(8): H01M4/131H01M4/1391H01M4/48H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/131H01M4/1391H01M4/483H01M4/628H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 刘文博陈雪张世超颜家振李宁
Owner SICHUAN UNIV
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