三维石墨烯/锗复合电极的制备及其储锂性能的研究
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- 英文论文题名：Fabrication and super Li storage properties of three- dimensional Ge@C/graphene composite electrode
- 论文作者：彭长健 ; 王蕾 ; 李庆伟 ; 李园园 ; 霍开富
- 英文论文作者：Changjian Peng ; Lei Wang ; Qingwei Li ; Yuanyuan Li ; Kaifu Huo ; Wuhan National Laboratory for Optoelectronics(WNLO) and School of Optical and Electronic Information ; Huazhong University of Science and Technology
- 年：2016
- 作者机构：武汉国家光电实验室华中科技大学;
- 论文关键词：锂离子电池 ; 无粘结剂 ; 自支撑 ; 类蜘蛛状
- 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：TB33;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：258k
- 原文格式：D
- 会议级别：全国
摘要
锂离子电池由于能量密度大、平均输出电压高、自放电小、没有记忆效应、使用寿命长等优点而被广泛用于电子产品,移动电子设备及电动汽车的供能~([1])。无粘结剂,自支撑的负极材料由于其制备工艺简单、能量密度高而受到广泛的关注~([2])。本文采用化学气相沉积(CVD)法制备的三维石墨烯为骨架,通过水热法使得氧化锗附着在三维石墨烯表面,最后采用CVD并通过随后的氢气还原过程生成类蜘蛛状的碳包锗/三维石墨烯复合结构。所制备的复合电极在0.5C下,1200次循环后容量仍高达594mAh/g(基于电极总质量计算),当电流密度由0.2C增大到8C时,74%的容量保持,显示出较好的循环稳定性和倍率性能。这种以三维石墨烯为骨架的无粘结剂的柔性电极为高能量密度、高功率密度的锂离子电池的开发提供了一个新的思路。
Lithium ion batteries have widely been used as power supply for portable mobile phones and EVs due to its large energy density,high voltage output,low self-discharge and long cycle life.In this work,we report binder-free and free-standing anode materials composed of carbon coated Ge in-situ grown on three-dimensional(3D) graphene.The 3D graphene deriving from chemical vapor depositing(CVD) was used as backbone and GeO_2 nanoparticles were adhered on the 3D graphene by the following hydrothermal method.At last,the spider-like carbon nanofiber structure was obtained by CVD and the subsequent H_2 reduction process.Such binder-free 3D Ge@C/graphene electrode could deliver a high capacity of 594 mA h g~(-1)(calculated based on the total mass) after 1200 cycles at a 0.5 C rate as well as 74%capacity retention when the current is increased 40 times from 0.2 to 8 C,suggesting good cycling stability and rate performance.
Lithium ion batteries have widely been used as power supply for portable mobile phones and EVs due to its large energy density,high voltage output,low self-discharge and long cycle life.In this work,we report binder-free and free-standing anode materials composed of carbon coated Ge in-situ grown on three-dimensional(3D) graphene.The 3D graphene deriving from chemical vapor depositing(CVD) was used as backbone and GeO_2 nanoparticles were adhered on the 3D graphene by the following hydrothermal method.At last,the spider-like carbon nanofiber structure was obtained by CVD and the subsequent H_2 reduction process.Such binder-free 3D Ge@C/graphene electrode could deliver a high capacity of 594 mA h g~(-1)(calculated based on the total mass) after 1200 cycles at a 0.5 C rate as well as 74%capacity retention when the current is increased 40 times from 0.2 to 8 C,suggesting good cycling stability and rate performance.
引文
[1]Armand,M.;Tarascon,J.M.Nature.2008,451(7179):652.
[2]Chao,D.;Xia,X.;Liu,J.;Fan,Z.Adv.Mater.,2014,26(33):5794.
[2]Chao,D.;Xia,X.;Liu,J.;Fan,Z.Adv.Mater.,2014,26(33):5794.