Preparation method and application of shell-core carbon-coated metal phosphide nanometer composite particle

A technology of nanocomposite particles and metal nanoparticles, which is applied in the application of lithium-ion battery anode materials in the field of lithium-ion batteries, and in the field of preparation of core-shell carbon-coated metal phosphide nanocomposite particles, which can solve the complex preparation process and the preparation Long cycle time, electrode pulverization failure and other problems, to achieve the effect of simple preparation process, low raw material cost, and inhibition of oxidation

Inactive Publication Date: 2017-11-03
CHANGZHOU INST OF DALIAN UNIV OF TECH
View PDF4 Cites 18 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this method, red phosphorus powder and metal powder are mixed in proportion and put into a ball mill tank, ball milled in a hydrogen or argon atmosphere for 10-50 hours, and the ball mill product is pre-baked at 400-1000°C for 5-30 hours in the same atmosphere, and finally Secondary roasting at 100-600°C for 5-30 hours under a hydrogen or argon atmosphere, the material obtained by this method has a long preparation cycle, high energy consumption, and a complicated p

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation method and application of shell-core carbon-coated metal phosphide nanometer composite particle
  • Preparation method and application of shell-core carbon-coated metal phosphide nanometer composite particle
  • Preparation method and application of shell-core carbon-coated metal phosphide nanometer composite particle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031]The equipment used in this embodiment is an automatic control DC arc metal nano powder production equipment, which consists of a powder generation chamber, a powder particle size classification chamber, a powder collection chamber, a powder processing chamber, a vacuum system, a gas circulation system, a hydraulic transmission system, water cooling system and programming control system; the cathode and anode are installed in the powder generation chamber, and are connected to the external hydraulic transmission and programming control system through the wall of the powder generation chamber; when preparing the powder, the material is loaded into the anode, and the The cathode forms a gap of 10-30mm, the whole equipment is vacuumed and cooling water is passed through. After the active gas and condensed gas are introduced, the power supply and arc starter are started to form an arc between the cathode and anode, and the material starts to evaporate and condense to form nano...

Embodiment 2

[0034] The carbon-coated metal phosphide nanocomposite material prepared in Example 1 above was fabricated into a lithium ion electrode sheet. Wherein the electrode sheet is uniformly mixed with 80% carbon-coated nickel phosphide nanocomposite material, 10% Ketjen black and 10% polyvinylidene fluoride (PVDF) binder by mass ratio, and an appropriate amount of N-methylpyrrolidone is added (NMP) was dissolved, and the slurry was coated on a copper current collector to obtain an electrode; the experimental electrode was dried in a vacuum oven at 100°C for 12 hours, and the battery was assembled in a high-purity argon atmosphere glove box. The electrolyte is 1mol / L LiPF 6 solution, the solvent is ethylene carbonate (EC) and diethyl carbonate (DC) at a volume ratio of 1:1. A CR2025 button battery was assembled with polypropylene as the diaphragm and lithium sheets as the counter electrode.

[0035] The present invention prepares the negative electrode of the lithium ion battery wi...

Embodiment 1

[0036] The Raman spectrum (Raman) of the carbon-coated nickel phosphide nanocomposite that embodiment one obtains is as follows figure 2 shown. From the relative intensities of D peak and G peak in the figure, it can be confirmed that the coated carbon in this material contains a large number of defects.

[0037] image 3 with Figure 4 They are charge and discharge curves and cycle stability performance curves carried out at a current density of 300mA / g in the range of 0.01 to 3V at room temperature, respectively. As can be seen from the figure, when the carbon-coated nickel phosphide composite material prepared by the present invention is used as the lithium-ion battery negative electrode material, it has an initial discharge specific capacity close to 2140mAh / g, Figure 4 It shows that its cycle performance is very stable. After the 15th cycle, its reversible specific capacity remained at 1300mAh / g.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention provides a preparation method of a shell-core carbon-coated metal phosphide nanometer composite particle. The obtained composite particle is used as a lithium ion battery negative electrode material to be applied to the field of a lithium ion battery. The preparation method comprises the steps of adding a certain proportion of a substance containing a carbon source and inert gas into automatic control DC arc metal nanometer powder production equipment, and evaporating a metal raw material to obtain a carbon-coated metal nanometer particle precursor; mixing and placing the precursor and red phosphorus powder in a high-pressure sealing reaction kettle for thermal treatment to obtain a carbon-coated metal phosphide nanometer composite material; and fabricating a lithium ion electrode plate by taking the carbon-coated nickel phosphide nanometer composite material as an active substance. The preparation method has the advantages that the carbon-coated nickel nanometer particle synthesized in an in-situ way is used as the precursor, the carbon-coated nickel phosphide nanometer composite particle is obtained by low-temperature phosphorization, and the composite particle has relatively high intercalation/de-intercalation lithium capacity density and cycle stability, is low in raw material cost and simple in process, can be prepared on a large scale and is suitable for industrial production.

Description

technical field [0001] The invention belongs to the field of nanomaterial preparation technology and application, and relates to a preparation method of a core-shell type carbon-coated metal phosphide nanocomposite particle and its application in the field of lithium ion batteries as a lithium ion battery negative electrode material. Background technique [0002] Lithium-ion batteries (also known as lithium-ion secondary batteries or lithium-ion batteries) have the advantages of light weight, high energy density, high voltage, small size, good cycle performance, and no memory effect. They are considered to be the most promising applications in the 21st century. One of the energy sources, and is widely used in transportation, communications and renewable energy sectors. At present, graphite is widely used as the negative electrode material of commercial lithium-ion batteries due to its advantages of long cycle time, large amount of existence and low cost. Although carbon mate...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): H01M4/36H01M4/58H01M4/583H01M4/136H01M4/133H01M10/0525B82Y40/00
CPCB82Y40/00H01M4/133H01M4/136H01M4/366H01M4/5805H01M4/583H01M10/0525Y02E60/10
Inventor 黄昊吴爱民靳晓哲高嵩
Owner CHANGZHOU INST OF DALIAN UNIV OF TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap