文档介绍：
硝酸用量对天然石墨层间距及膨胀结构的
影响#
杨绍斌,沈丁,吴晓光,董伟*
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(辽宁工程技术大学材料科学与工程学院,辽宁阜新 123000)
摘要:本文以天然鳞片石墨为原料,在 HNO3-HCOOH 体系中,采用先插层再炭包覆处理的
方法对石墨进行改性,研究了氧化剂 HNO3 用量对石墨碳层间距、比表面积及表面形貌的影
响。结果表明,采用先插层再炭包覆处理的方法能够使石墨碳层间距保持拉大的状态,碳层
间距可以稳定在 ~ nm 之间。氧化剂 HNO3 用量对石墨膨胀倍数影响明显,随着
HNO3 用量的增大,石墨膨胀倍数呈现线性增大的趋势,比表面积呈现先小幅增加后迅速增
加的趋势。
关键词:天然石墨;锂离子电池;石墨层间距;炭包覆
中图分类号:TM
The influence on graphite layer distance and expansion
structure of natural graphite of nitrate content
YANG Shaobin, SHEN Ding, WU Xiaoguang, DONG Wei
(College of Materials Science and Engineering, Liaoning Technical University,
LiaoNing FuXin 123000)
Abstract: In this paper, the graphite was modified by the method of intercalation and then carbon
coating in HNO3-HCOOH system, using natural flake graphite as raw material. The influence of
oxidant amount HNO3 on graphite layer distance, specific surface area and surface morphology
was investigated. The results show that, the carbon layer distance can be stable at ~
nm by the method of intercalation and then carbon coating. The dosage of oxidant HNO3 affects
graphite expansion ratio, significantly. With HNO3 content increasing, the graphite expansion
ratio showed a linear increasing trend and the specific surface area increases slowly and then
increases rapidly.
Keywords: natural graphite; lithium battery; graphite layer