A new type of nano-carbon sphere anode material for lithium-ion batteries

A lithium-ion battery, nano-carbon ball technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of environmental pollution, less lithium-ion de-intercalation sites, and small battery capacity, and achieve guaranteed volumetric energy density and Coulombic efficiency, good reversible capacity and cycling performance, the effect of increased surface oxygen-containing functional groups

Active Publication Date: 2021-03-30
SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a novel nano-carbon sphere negative electrode material for lithium-ion batteries, which solves the problem of poor compatibility between the existing negative electrode material and the electrolyte, large particle size, and poor morphology. Poor, and there is a long diffusion migration path in the charge and discharge process, and there are few lithium ion deintercalation sites, resulting in small battery capacity, poor rate performance and cycle stability.
[0006] The present invention also provides a preparation method of a novel nano-carbon sphere negative electrode material for lithium-ion batteries, which solves the problems of complex preparation process, high required temperature, high energy consumption, low efficiency, environmental pollution and high cost.

Method used

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  • A new type of nano-carbon sphere anode material for lithium-ion batteries
  • A new type of nano-carbon sphere anode material for lithium-ion batteries
  • A new type of nano-carbon sphere anode material for lithium-ion batteries

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Experimental program
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Effect test

Embodiment 1

[0028] The tube furnace was heated up to 500°C at a rate of 5°C / min under a nitrogen atmosphere, then acetylene gas was introduced at a flow rate of 100mL / min, and the chemical vapor deposition reaction was carried out for 60 minutes without a catalyst to obtain Nano-carbon spheres, and then place the nano-carbon spheres in a nitric acid solution with a concentration of 60%, and mix and stir at 60°C for 1h. Dry it in a vacuum drying oven for 12 hours, then grind it and pass through a 300-mesh porous sieve to obtain a new nano-carbon sphere negative electrode material for lithium-ion batteries.

Embodiment 2

[0030] The tube furnace was heated up to 500°C at a rate of 5°C / min under a nitrogen atmosphere, then acetylene gas was introduced at a flow rate of 100mL / min, and the chemical vapor deposition reaction was carried out for 60 minutes without a catalyst to obtain Nano-carbon spheres, and then place the nano-carbon spheres in a nitric acid solution with a concentration of 63%, and mix and stir at 60°C for 1h. After the reaction is completed, cool to room temperature, filter and wash until neutral, and then Dry it in a vacuum drying oven for 12 hours, then grind it and pass through a 400-mesh porous sieve to obtain a new nano-carbon sphere negative electrode material for lithium-ion batteries.

Embodiment 3

[0032] The tube furnace was heated up to 450°C at a rate of 7°C / min under a nitrogen atmosphere, and then acetylene gas was introduced at a flow rate of 300mL / min, and the chemical vapor deposition reaction was carried out for 30 minutes without a catalyst to obtain Nano-carbon spheres, and then place the nano-carbon spheres in a nitric acid solution with a concentration of 65%, and mix and stir at 70°C for 1h. Dry it in a vacuum drying oven for 36 hours, then grind it and pass through a 300-mesh porous sieve to obtain a new nano-carbon sphere negative electrode material for lithium-ion batteries.

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Abstract

The invention discloses a novel nano carbon sphere cathode material used for a lithium ion battery. The material is characterized by heating a tube furnace to 400-590 DEG C in an inert atmosphere, andthen injecting a carbon source gas, and carrying out a chemical vapor deposition reaction without a catalyst to obtain nano carbon spheres; then, placing the nano carbon spheres in a strong acid solution to carry out acidification reaction; and after the reaction is finished, cooling to a room temperature, carrying out suction filtration, washing, drying, and then grinding and sieving with a porous sieve of 300 to 400 meshes to obtain the novel nano carbon sphere cathode material used for the lithium ion battery. An average diameter of the cathode material is between 80 and 90 nm. A degree ofdisorder of a sample is increased, surface oxygen-containing functional groups are increased too, lithium ion disembedding sites are greatly enlarged, a good reversible capacity and good cycle performance are possessed, problems of poor rate performance caused by slow electron and ion transmission and the like are avoided, and a good application prospect is achieved.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a novel nano-carbon sphere negative electrode material for lithium-ion batteries. Background technique [0002] As a representative of modern high-performance batteries, lithium-ion batteries are increasingly used in consumer electronics, new energy vehicles, and energy storage, and their demand and market scale continue to expand. Because lithium batteries have various excellent characteristics such as large energy density, good safety, high voltage, long life, and environmental friendliness, the utilization of lithium batteries exists in various fields, such as: electronic products (mobile phones, tablet computers) ), the aerospace field (energy storage power supply), the application of vehicles (electric vehicles), etc. In theory, the battery should have the following advantages at the same time: low cost, high energy density, high tap density, good ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M10/0525
CPCH01M4/625H01M10/0525Y02E60/10
Inventor 陈建彭川刘平唐成玉何宇廖明东
Owner SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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