期刊
ADVANCED FUNCTIONAL MATERIALS
卷 27, 期 39, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201703538
关键词
anode materials; lithium-ion batteries; plasma electrolytic oxidation; porous oxide films; TiO2/SiO2 composites
类别
资金
- Basic Science Research Program through National Research Foundation of Korea (NRF) - Ministry of Education [2015R1A4A1042434]
- Human Resources Development program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant - Korea government Ministry of Trade, Industry and Energy [20174030201500]
- Korea Evaluation Institute of Industrial Technology (KEIT) [20174030201500] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
In this study, partially crystalline anodic TiO2 with SiO2 well-distributed througout the entire oxide film is prepared using plasma electrolytic oxidation (PEO) to obtain a high-capacity anode with an excellent cycling stability for Li-ion batteries. The micropore sizes in the anodic film become inhomogeneous as the SiO2 content is increased from 0% to 25%. The X-ray diffraction peaks show that the formed oxide contains the anatase and rutile phases of TiO2. In addition, X-ray photoelectron spectroscopy and energy-dispersive X-ray analyses confirm that TiO2 contains amorphous SiO2. Anodic oxides of the SiO2/TiO2 composite prepared by PEO in 0.2 M H2SO4 and 0.4 M Na2SiO3 electrolyte deliver the best performance in Li-ion batteries, exhibiting a capacity of 240 mu Ah cm(-2) at a fairly high current density of 500 mu A cm(-2). The composite film shows the typical Li-TiO2 and Li-SiO2 redox peaks in the cyclic voltammogram and a corresponding plateau in the galvanostatic charge/discharge curves. The as-prepared SiO2/TiO2 composite anode shows at least twice the capacity of other types of binder-free TiO2 and TiO2 composites and very stable cycling stability for more than 250 cycles despite the severe mechanical stress.
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