球形Sn-Fe_3O_4@C复合材料的嵌锂电化学性能
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- 英文论文题名：Spherical shaped Sn-Fe_3O_4@C composite as novel anode for lithium ion batteries
- 论文作者：张涵茵 ; 胡仁宗 ; 朱敏
- 英文论文作者：Hanyin Zhang ; Renzong Hu ; Min Zhu ; School of Materials Science and Engineering ; South China University of Technology
- 年：2016
- 作者机构：华南理工大学材料科学与工程学院;
- 论文关键词：Sn-C复合材料 ; Fe_3O_4 ; 锂离子电池 ; 负极材料
- 英文论文关键词：Sn-C composite ; Fe_3O_4 ; anodes ; lithium ion batteries
- 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：TB332;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：174k
- 原文格式：D
- 会议级别：全国
摘要
Sn-C体系复合材料因结合了Sn材料的高容量和碳材料良好的稳定性而被认为是理想的下一代锂离子电池负极材料。但当Sn含量高时,在充放电的过程中活性材料剧烈膨胀收缩,导致电极材料失效;碳含量过高时则高容量的优势难以发挥。Fe_3O_4作为可嵌锂材料,具有高容量、价格便宜等优点,但与锂反应的电位偏高。因此,本文以改善Sn-C基复合负极材料的性能为目标,通过放电等离子体辅助球磨复合球磨Sn、Fe_3O_4和C,制备出一种容量高、电压适中和循环性能优异的球形Sn-Fe_3O_4@C纳米复合材料。Sn-Fe_3O_4@C复合材料具有纳米Sn和Fe_3O_4均匀分布于C基体上的微观结构,这种结构有效改善了Sn-C基负极的循环稳定和充放电高倍率能。在2000 mA g~(-1)放电倍率下,500次循环后的可逆容量约为750 mAhg~(-1)。该复合材料制备方法的简单高效、具有良好的应用前景。
In order to further enhance the reversible capacity and cycleability for lithium storage of the Sn-based alloy anode materials,a spherical shaped Sn-Fe_3O_4@C ternary-phase composite consisting of nanosized tin(Sn),magnetite(Fe_3O_4),and graphite(C),are prepared by a discharge-plasma-assisted milling.The well dispersion of co-existed Sn and Fe_3O_4 in spherical carbon matrix results in highly stability,high capacity and rate capability of the nanostructured Sn-Fe_3O_4@C composites anode.The Sn-Fe_3O_4@C nanocomposite anodes demonstrate a stable and high capacity of 793 mAh g~(-1) after 240 cycles between 0.01 and 3.0 V vs.Li/Li~+at 200 mA g~(-1).Furthermore,a reversible capacity of ~750 mAhg~(-1) was obtained after 500 cycles,even when the current density increased to 2000 mAg~(-1).The spherical shape of the materials and its easy preparation makes it significant for practical application.
In order to further enhance the reversible capacity and cycleability for lithium storage of the Sn-based alloy anode materials,a spherical shaped Sn-Fe_3O_4@C ternary-phase composite consisting of nanosized tin(Sn),magnetite(Fe_3O_4),and graphite(C),are prepared by a discharge-plasma-assisted milling.The well dispersion of co-existed Sn and Fe_3O_4 in spherical carbon matrix results in highly stability,high capacity and rate capability of the nanostructured Sn-Fe_3O_4@C composites anode.The Sn-Fe_3O_4@C nanocomposite anodes demonstrate a stable and high capacity of 793 mAh g~(-1) after 240 cycles between 0.01 and 3.0 V vs.Li/Li~+at 200 mA g~(-1).Furthermore,a reversible capacity of ~750 mAhg~(-1) was obtained after 500 cycles,even when the current density increased to 2000 mAg~(-1).The spherical shape of the materials and its easy preparation makes it significant for practical application.
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