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Carbon-based nanocomposite material for electrode

A carbon-based nano-composite material technology, applied in the fields of nanotechnology, battery electrodes, and nanotechnology for materials and surface science, can solve the problems of rapid disintegration of electrode materials, reduction of material cycle capacity, and large volume changes. Achieve the effect of being beneficial to large-scale synthesis, easy to collect, and less impurities

Inactive Publication Date: 2016-09-28
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, nanomaterials also have disadvantages, such as large volume changes during charging / discharging, which will cause agglomeration between particles, resulting in a decrease in the cycle capacity of the material
The induced mechanical stress may lead to rapid disintegration of the electrode material
At the same time, nanomaterials will also increase the probability of forming a thicker solid electrolyte interface film, and a thicker SEI film will consume part of the lithium
Therefore, the application of single-phase nanomaterials as battery electrode materials has certain limitations.

Method used

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  • Carbon-based nanocomposite material for electrode
  • Carbon-based nanocomposite material for electrode
  • Carbon-based nanocomposite material for electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] (1)Ni(L-asp)(H 2 O) 2 Preparation: NiCO 3 2Ni(OH) 2 ·xH 2 O, L-asp and H 2 O was mixed in a ratio of 1:1:200, and kept under heating and stirring at 95°C for 2.5 hours, until most of the powder was dissolved in water, then the heating and stirring were stopped. The insoluble matter in the solution was removed by filtration to obtain a clear solution, which was placed in an oven at 100°C for 1 day, and the green Ni(L-asp)(H 2 O) 2 Crystals, collected for later use.

[0049] (2)[Ni 2 (L-asp) 2 (bpy)] preparation of crystal material: Ni(L-asp)(H 2 O) 2 Add it into the mixed solution of methanol and water, and continue to add a certain amount of 4,4'-pyridine under stirring conditions after partially dissolving, so that the mass ratio of each substance in the final solution is Ni(L-asp)(H 2 O) 2 :4,4'-pyridine:methanol:water=1:4:21.7:27.4. The solution was transferred to an autoclave, sealed, and crystallized in an oven at 150° C. for 2 days. After the reactor...

Embodiment 2

[0055] Prepare [Ni by step (1) and (2) in embodiment 1 2 (L-asp) 2 (bpy)] crystalline powder material.

[0056] The synthesized [Ni 2 (L-asp) 2 (bpy)] The crystal powder is lightly ground until there are no larger particles and spread on the bottom of the ceramic crucible. The porcelain crucible is placed in the middle of the tube furnace, and then the internal air of the tube furnace is removed by vacuuming. Perform replacement and repeat 3 times to ensure a sufficient anaerobic environment. The flow rate of nitrogen is controlled at 80ml per minute, and the heating rate is 5°C per second. First, stay at 150°C for 2 hours, and then pyrolyze at 900°C for 5 hours. Get Metal@Carbon Composite.

[0057] Step (4) and step (5) in Example 1 were repeated, and the carbon-based nanocomposite material used for the electrode was characterized by transmission electron microscopy and lithium ion battery performance.

Embodiment 3

[0059] Prepare [Ni by step (1) and (2) in embodiment 1 2 (L-asp) 2 (bpy)] crystalline powder material.

[0060] The synthesized [Ni 2 (L-asp) 2 (bpy)] The crystal powder is lightly ground until there are no larger particles and spread on the bottom of the ceramic crucible. The porcelain crucible is placed in the middle of the tube furnace, and then the internal air of the tube furnace is removed by vacuuming. Perform replacement and repeat 3 times to ensure a sufficient anaerobic environment. The flow rate of nitrogen is controlled at 80ml per minute, the heating rate is 5°C per second, first stay at 150°C for 2 hours, and then pyrolyze at 1100°C for 5 hours. Get Metal@Carbon Composite.

[0061] Step (4) and step (5) in Example 1 were repeated, and the carbon-based nanocomposite material used for the electrode was characterized by transmission electron microscopy and lithium ion battery performance.

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Abstract

The invention discloses a carbon-based nanocomposite material for an electrode, and belongs to the field of preparation of metal@carbon nanocomposite materials. According to a preparation method, the carbon-based nanocomposite material for the electrode is obtained by high-temperature pyrolysis of a metal-organic skeleton compound in an inert protective atmosphere. The metal-organic skeleton compound [Ni2(L-asp)2(bpy)] is utilized as a precursor; and the carbon-based nanocomposite material with a uniform dimension is prepared through a one-step high-temperature pyrolysis process. The product obtained by the method is single in phase, very few in impurities, especially easy to collect, high in yield and beneficial to large-scale synthesis; and the microstructure of the carbon-based nanocomposite material prepared by the method has excellent properties of high stability and the like in application of the electrode material of a lithium-ion battery.

Description

technical field [0001] The invention belongs to the field of metal@carbon nanocomposite material preparation, and in particular relates to a carbon-based nanocomposite material used for electrodes. Background technique [0002] The depletion of non-renewable resources makes the development and utilization of new energy imminent. The new energy represented by tidal energy, wind energy, and solar energy has greater randomness and intermittency in power output. In order to realize grid-connected applications, energy storage and conversion technologies, especially chemical storage systems represented by secondary battery systems technology has received more and more attention. Among them, rechargeable lithium-ion batteries have dominated the secondary battery market due to their advantages such as long cycle life, low self-discharge, high operating voltage, high specific energy, and no memory effect, and are considered to be the most promising energy storage system in the futur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/52H01M4/583H01M4/62H01M4/36H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/366H01M4/52H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 范黎黎康子曦王荣明孙道峰
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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