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Sol‐gel Synthesis and Electrochemical Performance of Li 4− x Mg x Ti 5− x Zr x O 12 Anode Material for Lithium‐ion Batteries
Author(s) -
Qiu Caixia,
Yuan Zhongzhi,
Liu Ling,
Cheng Sijie,
Liu Jincheng
Publication year - 2013
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.201201111
Subject(s) - electrochemistry , chemistry , anode , analytical chemistry (journal) , dielectric spectroscopy , lithium (medication) , doping , electrode , lattice constant , nuclear chemistry , materials science , medicine , optoelectronics , chromatography , endocrinology , physics , diffraction , optics
The anode materials Li 4− x Mg x Ti 5− x Zr x O 12 ( x =0, 0.05, 0.1) were successfully synthesized by sol‐gel method using Ti(OC 4 H 9 ) 4 , CH 3 COOLi·2H 2 O, MgCl 2 ·6H 2 O and Zr(NO 3 ) 3 ·6H 2 O as raw materials. The crystalline structure, morphology and electrochemical properties of the as‐prepared materials were characterized by XRD, SEM, cyclic voltammograms (CV), electrochemical impedance spectroscopy (EIS) and charge‐discharge cycling tests. The results show that the lattice parameters of the Mg‐Zr doped samples are slightly larger than that of the pure Li 4 Ti 5 O 12 , and Mg‐Zr doping does not change the basic Li 4 Ti 5 O 12 structure. The rate capability of Li 4− x Mg x Ti 5− x Zr x O 12 ( x =0.05, 0.1) electrodes is significantly improved due to the expansile Li + diffusion channel and reduced charge transfer resistance. In this study, Li 3.95 Mg 0.05 Ti 4.95 Zr 0.05 O 12 represented a relatively good rate capability and cycling stability, after 400 cycles at 10 C, the discharge capacity retained as 134.74 mAh·g −1 with capacity retention close to 100%. The excellent rate capability and good cycling performance make Li 3.95 Mg 0.05 Ti 4.95 Zr 0.05 O 12 a promising anode material in lithium‐ion batteries.