Li位Mg掺杂对新型负极材料BaLi_2Ti_6O_(14)电化学性能的影响
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- 英文论文题名：Enhanced Electrochemical Properties of BaLi_2Ti_6O_(14) Anode Fabricated Via Lithium Site Substitution by Magnesium
- 论文作者：林晓婷 ; 俞浩翔 ; 钱尚书 ; 鄢蕾 ; 李鹏 ; 舒杰
- 英文论文作者：Xiaoting Lin ; H.X.Yu ; S.S.Qian ; L.Yan ; P.Li ; J.Shu ; Faculty of Materials Science and Chemical Engineering ; Ningbo University
- 年：2016
- 作者机构：宁波大学材料科学与化学工程学院;
- 论文关键词：BaLi_2Ti_6O_(14) ; 掺杂 ; 负极材料 ; 电化学性能
- 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：TQ132.35
- 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：299k
- 原文格式：D
- 会议级别：全国
摘要
本文通过固相法合成了Na~+、Mg~(2+)金属离子掺杂的BaLi_2Ti_6O_(14),并对合成样品进行了结构、形貌和电化学性能表征。XRD结果表明,微量Na~+、Mg~(2+)离子掺杂不会引起BaLi_2Ti_6O_(14)晶体结构的改变。通过比较电化学性能可知,BaLi_(1.9)Mg_(0.1)Ti_6O_(14)表现出比其他材料更高的可逆容量和更好的倍率性能。如图1(a)所示,当电流密度为5C时,BaLi_(1.9)Mg_(0.1)Ti_6O_(14)的首圈可逆充电容量为111.7 mAh g~(-1)。经过200周循环,容量仍然可保持在90.1 mAh g~(-1),容量保持率为80.7%。这主要归因于掺杂Mg~(2+)以后样品颗粒减小,电子/离子导电率提高和电荷转移电阻降低。此外,图1(b)中的原位XRD测试结果表明BaLi_(1.9)Mg_(0.1)Ti_6O_(14)的结构在其充放电过程中具有高度可逆型和稳定性。
Na-,Mg-doped BaLi_2Ti_6O_(14) anodes were fabricated and evaluated as lithium storage materials for Lithium-ion batteries.XRD results show that Na or Mg is successfully introduced into the Li site,and it does not alter the basic structure of BaLi_2Ti_6O_(14).The BaLi_(1.9)Mg_(0.1)Ti_6O_(14) exhibits significant improvements on the electrochemical properties in terms of the specific capacity and rate capability.It can deliver an initial charge capacity of 111.7 mAh g~(-1) at 5C.After 200 cycles,it can maintain a reversible capacity of 90.1 mAh g~(-1) with the capacity retention of80.7%.The enhanced electrochemical properties can be attributed to the reduced particle size,decreased charge transfer resistance and enhanced ionic and electronic conductivity induced by Mg~(2+) doping.Besides,in-situ XRD also reveals that BaLi_(1.9)Mg_(0.1)Ti_6O_(14) has high structural stability and reversibility during charge/discharge process.
Na-,Mg-doped BaLi_2Ti_6O_(14) anodes were fabricated and evaluated as lithium storage materials for Lithium-ion batteries.XRD results show that Na or Mg is successfully introduced into the Li site,and it does not alter the basic structure of BaLi_2Ti_6O_(14).The BaLi_(1.9)Mg_(0.1)Ti_6O_(14) exhibits significant improvements on the electrochemical properties in terms of the specific capacity and rate capability.It can deliver an initial charge capacity of 111.7 mAh g~(-1) at 5C.After 200 cycles,it can maintain a reversible capacity of 90.1 mAh g~(-1) with the capacity retention of80.7%.The enhanced electrochemical properties can be attributed to the reduced particle size,decreased charge transfer resistance and enhanced ionic and electronic conductivity induced by Mg~(2+) doping.Besides,in-situ XRD also reveals that BaLi_(1.9)Mg_(0.1)Ti_6O_(14) has high structural stability and reversibility during charge/discharge process.
引文
[1]Ji,S.Z.;Zhang,J.Y.;Wang,W.W.;Huang,Y.Mater.Chem.Phys.2010,123:510.
[2]Zhao,H.L.;Li,Y.;Zhu,Z.M.;Lin,J.Electrochim.Acta 2008,53:7079.
[2]Zhao,H.L.;Li,Y.;Zhu,Z.M.;Lin,J.Electrochim.Acta 2008,53:7079.