亚临界水热制备膨胀中间相碳微球用作钠离子电池电极材料
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- 英文论文题名：Subcritical hydrothermal preparation of expanded mesocarbon microbeads as outstandiing anode for sodium-ion batteries
- 论文作者：章雄峰 ; 武长城 ; 时志强
- 英文论文作者：Xiongfeng Zhang ; Changcheng Wu ; Zhiqiang Shi ; College of Materials Science and Engineering ; Tianjin Polytechnic University
- 年：2016
- 作者机构：天津工业大学材料科学与工程学院;
- 论文关键词：微膨胀 ; 水热还原 ; 钠离子电池
- 会议召开时间：2016-07-01
- 会议录名称：中国化学会第30届学术年会摘要集-第三十分会：化学电源
- 语种：中文
- 分类号：TQ127.11;TM912
- 学会代码：ZGHY
- 会议名称：中国化学会第30届学术年会-第三十分会 ; 化学电源
- 会议地点：中国辽宁大连
- 主办单位：中国化学会
- 学会名称：中国化学会
- 页数：1
- 文件大小：331k
- 原文格式：D
- 会议级别：全国
摘要
膨胀石墨具有典型的石墨的层状结构,且膨胀石墨的层间距较石墨大能够有效地嵌入钠离子而受到热捧,有研究者报道适合直径大的Na离子的最小层间距离为0.37 nm~([1])。中间相碳微球(Mesocarbon Microbeads,简称为MCMB)具有良好的球形度、接触面积大有利于电子传递等优势得到人们的青睐~([2])。本文采用石墨化中间相碳微球(MCMB)作原料,用低温氧化法氧化得到层间距较石墨2倍的氧化中间相碳微球(O-MCMB),利用水热法还原氧化中间相碳微球得到层间微膨胀的还原氧化中间相碳微球(HRO-MCMB),探究水热过程中关键因素温度对还原程度的变化,探究钠离子电池在这种球形微膨胀的软碳类材料中的电化学性能。将其组装成钠离子半电池,,采用恒电流充放电测试其电化学性能。120、150℃水热还原的微膨胀碳微球的可逆比容量分别达到175.3mAh/g;158.2mAh/g(在20mA/g的电流密度下)。
Expanded graphite as the typical layered structure of graphite has large interlayer distance for electrochemical intercalation of Na+ ions.Some researchers have reported for the large interlayer distance(0.37nm) between the graphitic sheets,which agrees with the interlayered distance predicted by theoretical calculations to enable Na-ion insertion in carbon materials~([1]).This article used the graphitized mesocarbon microbeads(MCMB) as raw materials,with low temperature oxidation and using the method of hydrothermal reduction MCMB for expansion of the MCMB(HRO- MCMB),to explore the key factor in the process of hydrothermal temperature on the degree of reduction.Galvanostatic studies show that 120,150 ℃ reduction MCMB can deliver a high reversible specific capacity of 175.3mAh g~(-1),158.2mAh g~(-1) at a current density of 20 mA g~(-1),respectively.
Expanded graphite as the typical layered structure of graphite has large interlayer distance for electrochemical intercalation of Na+ ions.Some researchers have reported for the large interlayer distance(0.37nm) between the graphitic sheets,which agrees with the interlayered distance predicted by theoretical calculations to enable Na-ion insertion in carbon materials~([1]).This article used the graphitized mesocarbon microbeads(MCMB) as raw materials,with low temperature oxidation and using the method of hydrothermal reduction MCMB for expansion of the MCMB(HRO- MCMB),to explore the key factor in the process of hydrothermal temperature on the degree of reduction.Galvanostatic studies show that 120,150 ℃ reduction MCMB can deliver a high reversible specific capacity of 175.3mAh g~(-1),158.2mAh g~(-1) at a current density of 20 mA g~(-1),respectively.
引文
[1]Yuliang Cao.;Lifen Xiao.Nano Lett.2012,12:3783-3787.
[2]时志强,郭春雨,易炜,刘利,王成扬.电源技术,2009,33(9):363
[2]时志强,郭春雨,易炜,刘利,王成扬.电源技术,2009,33(9):363