小鳞片膨胀石墨的制备及电化学性能

李飞; 高伦; 彭成龙; 沈毅; 黄焱球; 李珍; 叶厚理

doi:10.3969/j.issn.1000-6532.2022.02.028

小鳞片膨胀石墨的制备及电化学性能

1.
中国地质大学(武汉)材料与化学学院，湖北　武汉　430074

2.
福建省闽北地质大队，福建　南平　354000

基金项目: 黑龙江省科技项目“黑龙江东部石墨矿质量分类分级及高效利用评价”

详细信息

作者简介: 李飞（1978-），男，博士，副教授，研究方向为矿物的深加工及应用

通讯作者: 李珍（1963-），女，博士，教授，研究方向为矿物的深加工及应用

中图分类号: TD982

收稿日期: 2021-04-25

刊出日期: 2022-04-25

Preparation and Electrochemical Properties of Small Flake Expanded Graphite

1.
School of Materials and Chemistry, China University of Geosciences, Wuhan, Hubei, China

2.
Minbei Geological Brigade, Nanping, Fujian, China

More Information

Corresponding author: Li Zhen, zhenli@cug.edu.cn

Received Date: 25 April 2021

Publish Date: 25 April 2022

摘要

摘要:
本文以邵武科踏小鳞片高纯石墨为原料，采用双氧水为氧化剂，浓硫酸为插层剂制备可膨胀石墨，经过微波膨化得到膨胀石墨。系统研究了双氧水和浓硫酸用量对膨胀石墨的表面形貌、膨胀容积和比表面积的影响。研究发现，膨胀石墨保留了天然小鳞片石墨的结构特征，呈蠕虫状表面形貌，膨胀石墨的膨胀容积最高可达291.39 mL/g，比表面积达55.62 m²/g。以小鳞片膨胀石墨为锂离子电池负极材料组装纽扣电池并对其电化学性能进行了检测，表现出较好的脱/嵌锂容量和良好的循环性能。
- 膨胀石墨 /
- 化学氧化 /
- 膨胀容积 /
- 比表面积 /
Abstract:
In this paper, expanded graphite was prepared by chemical oxidation system with hydrogen peroxide as oxidant and concentrated sulfuric acid as intercalation agent. Expanded graphite was obtained by microwave expansion. The effects of the amount of hydrogen peroxide and concentrated sulfuric acid on the morphology and specific surface area of expanded graphite were systematically studied. It was found that the expanded graphite retained the structural characteristics of natural small flake graphite and had wormlike surface morphology, The maximum expansion volume was 291.39 ml/g and the specific surface area was 55.62 m²/g. Small flake expanded graphite was used as anode material of lithium ion battery to assemble button battery and its electrochemical performance was tested which showed good lithium removal/intercalation capacity and good cycling performance.
- Expanded graphite /
- Chemical oxidation /
- Expansion volume /
- Specific surface area /
- Anode material

HTML全文

图 1 石墨、可膨胀石墨和膨胀石墨的XRD

Figure 1.

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图 2 不同双氧水用量膨胀石墨膨胀容积

Figure 2.

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图 3 不同浓硫酸用量膨胀石墨的膨胀容积

Figure 3.

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图 4 不同浓硫酸用量膨胀石墨的BET比表面积

Figure 4.

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图 5 不同浓硫酸用量下膨胀石墨的SEM

Figure 5.

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图 6 膨胀石墨的循环稳定性

Figure 6.

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