小鳞片膨胀石墨的制备及电化学性能

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。 

Preparation and Electrochemical Properties of Small Flake Expanded Graphite

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.