Influence of Sc3+ doping in B-site on electrochemical performance of Li4Ti5O12 anode materials for lithium-ion battery
Influence of Sc3+ doping in B-site on electrochemical performance of Li4Ti5O12 anode materials for lithium-ion battery
复制标题
B位Sc3掺杂对锂离子电池Li4Ti5O12负极材料电化学性能的影响
DOI：
10.1016/j.jpowsour.2013.10.137
复制
发表时间：
2014-03
影响因子：
9.2
通讯作者：
Dannong He
中科院分区：
文献类型：
--
作者：
Ding-Bang Xiong;Dan Wang;Xiaoyan Wu;Dannong He
以乙二胺四乙酸（EDTA）和柠檬酸（CA）为双组分螯合剂，采用改进的溶胶-凝胶法合成了锂离子电池正极材料Li 4 Ti 5 O 12（LTO）和Sc掺杂的Li4Ti4.95Sc0.05O12-δ（LTSO）。采用XRD、BET、XPS、EDX和SEM等手段对样品进行了表征。掺杂Sc全部进入到LTO尖晶石结构的16 d位，进而影响其形貌和性能。LTSO粉体呈三维网状结构，晶粒尺寸约为200 nm。LTSO电极材料在1 C和40 C下分别表现出174和94 mAh g− 1的优异初始放电容量。LTSO在不同电流速率下的可逆容量在50次循环后保持接近100%，与第二次循环的容量相比。电化学阻抗谱表明，Sc ~（3+）掺杂能显著提高LTO的电子电导率。循环伏安法测试也表明，LTSO具有小的极化电阻，由于高的电导率和锂离子的表观扩散速率。
Anode materials Li4Ti5O12(LTO) and Sc-doped Li4Ti4.95Sc0.05O12-δ(LTSO) for lithium-ion batteries are both successfully synthesized by the modified sol–gel method with ethylene diamine tetraacetic acid (EDTA) and citric acid (CA) as a bi-components chelating agent. The samples are characterized by XRD, BET, XPS, EDX and SEM. The dopant Sc totally enters into the 16d sites of the spinel structure of LTO, and then further affects its morphology and property. The LTSO powder exhibits a 3D network morphology and its grain size is about 200 nm. The LTSO electrode material exhibits an excellent initial discharge capacities of 174 and 94 mAh g−1at 1 C and 40 C, respectively. The reversible capacities of LTSO at different current rates remain nearly 100% after 50 cycles, which are compared with the capacities of the second cycles. Sc3+doping can greatly improve the electronic conductivity of LTO which is demonstrated by electrochemical impedance spectroscopy. Cyclic voltammetry measurements also reveal that LTSO has small polarization resistance due to the high electrical conductivity and Li-ion apparent diffusion rate.
登录
查看更多内容
锂离子电池负极材料La掺杂Li4Ti5O12的合成及电化学性能
影响因子：
5.2
作者：
Zhang C.;Zhang Y.;Wang J.;He D.
通讯作者：
He D.
影响因子：
3
作者：
F. Zhou;Xuemei Zhao;Hua-gui Zheng;Zude Zhang;M. Ji
通讯作者：
F. Zhou;Xuemei Zhao;Hua-gui Zheng;Zude Zhang;M. Ji
影响因子：
9.2
作者：
Hongxia Gu;Yao Zheng;R. Ran;Zongping Shao;W. Jin;N. Xu;J. Ahn
通讯作者：
Hongxia Gu;Yao Zheng;R. Ran;Zongping Shao;W. Jin;N. Xu;J. Ahn
影响因子：
8.6
作者：
Haetge, Jan;Hartmann, Pascal;Brezesinski, Torsten
通讯作者：
Brezesinski, Torsten
影响因子：
11.4
作者：
C. Samaras;Kyle W Meisterling
通讯作者：
C. Samaras;Kyle W Meisterling