Details

Autor(en) / Beteiligte

• Zhang, Yaoyao
• Zhang, Chunming
• Lin, Ye
• Xiong, Ding-Bang
• Wang, Dan
• Wu, Xiaoyan
• He, Dannong

Titel

Influence of Sc3+ doping in B-site on electrochemical performance of Li4Ti5O12 anode materials for lithium-ion battery

Ist Teil von

• Journal of power sources, 2014-03, Vol.250, p.50-57

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2014

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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−1 at 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. •An enhanced chelating agent scheme for pure phase and uniformly distributed products.•The bi-components chelating agent and Sc3+ doping to improve the particles dispersion and decrease the particle size.•The Sc3+ doping could cause some Ti4+ reduce to Ti3+ and stimulate the formation of oxygen vacancies.•Nano-scale Sc-doped Li4Ti5O12 oxides show excellent reversible capacity and cycling stability.