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Preparation method of negative electrode material of lithium-ion battery loaded with nano-boron on graphene

A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as inability to meet the needs of high-capacity electrodes, achieve good thermal and chemical stability, good conductivity, and negative electrode potential flat effect

Inactive Publication Date: 2019-02-22
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] At present, the specific capacity of graphite-based negative electrode materials is about 330-350mAh / g, which cannot meet people's needs for high-capacity electrodes.

Method used

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  • Preparation method of negative electrode material of lithium-ion battery loaded with nano-boron on graphene
  • Preparation method of negative electrode material of lithium-ion battery loaded with nano-boron on graphene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Example 1: Preparation of NaCl-KCl eutectic salt

[0032] Add NaCl (45g) and KCl (55g) into the ball mill jar, ball mill and mix at 700rpm for 1 hour, take it out and put it into a crucible, heat it in air at 700°C for 2 hours, and cool it to 25°C to obtain NaCl-KCl eutectic salt.

Embodiment 2

[0033] Example 2: Preparation of graphene-supported nano-boron precursor

[0034] Take the NaCl-KCl eutectic salt (10g) prepared in Example 1, add glucose monohydrate (0.4g), urea (0.2g), monohydrate monohydrate and Boric acid (0.1g) and NaCl-KCl eutectic salt (10g) were mixed by ball milling at a speed of 700rpm for 2 hours to prepare a precursor of graphene-loaded nano-boron.

Embodiment 3

[0035] Example 3: Preparation of Salt-Containing Graphene Loaded Nano Boron

[0036] Take the NaCl-KCl eutectic salt (20g) prepared in Example 1, add glucose monohydrate (0.4g), urea (0.2g), monohydrate monohydrate into the ball mill tank at a mass ratio of 4:2:1:200 Boric acid (0.1g) and NaCl-KCl eutectic salt (20g), rotating speed 700rpm ball milling and mixing for 2 hours, prepared graphene-loaded precursor of nano-boron;

[0037]The obtained precursor was heated to 110°C for 2 hours in a nitrogen atmosphere, then heated to 440°C for 3 hours, then heated to 1050°C, reduced for 2 hours and then cooled to 25°C to obtain salt-containing graphene-supported nano-boron. The heating rate for three times is 10°C / min.

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Abstract

The invention relates to the preparation technology of a negative electrode material of a lithium ion battery, and aims to provide a preparation method for graphene-loaded nanometer boron used as the negative electrode material of the lithium ion battery. The preparation method comprises the steps of performing ball grinding on NaCl and KCl and then heating, and cooling to obtain NaCl-KCl eutectic salt; then performing ball grinding and mixing on the eutectic salt and glucose monohydrate, urea and metaboric acid monohydrate; and performing temperature rising for three times under nitrogen atmosphere, washing off salt by distilling water, and performing vacuum drying to obtain the graphene-loaded nanometer boron. The graphene-loaded nanometer boron has the advantages of thermal stability, chemical stability, high conductivity, and capability of improving speed capacity of the lithium battery and enabling negative electrode potential to be flat; in addition, the graphene-loaded nanometer boron has a simple process, is free of toxic materials, and can be recycled as template eutectic salt; and the overall synthesis process only discharges CO<2> and water, so that the graphene-loaded nanometer boron is green and environment-friendly, and large-scale production can be realized.

Description

technical field [0001] The invention relates to a preparation method of a negative electrode material of a lithium ion battery, more specifically, the invention relates to a preparation method of a negative electrode material of a lithium ion battery loaded with nano-boron on graphene. Background technique [0002] Lithium-ion batteries have the advantages of light weight, large capacity, and no memory effect, so they have been widely used. Many digital devices now use lithium-ion batteries as power sources. The energy density of lithium-ion batteries is very high, its capacity is 1.5 to 2 times that of nickel-metal hydride batteries of the same weight, and its advantages such as low self-discharge rate and no toxic substances are important reasons for its wide application. In 1990, Nagoura and others in Japan developed a negative electrode using petroleum coke and LiCoO 2 Lithium-ion battery as the positive electrode: LiC 6 |LiClO 4 -PC+EC|LiCoO 2 . same year. The tw...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/38H01M4/587
CPCH01M4/38H01M4/587Y02E60/10
Inventor 李睿李洲鹏刘宾虹
Owner ZHEJIANG UNIV
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