期刊
JOURNAL OF POWER SOURCES
卷 196, 期 5, 页码 2848-2853出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2010.07.023
关键词
Lithium titanates; Hydrogen titanates; Thermal transformation; Lithium-ion batteries
资金
- National Natural Science Foundation of China [20633040, 20925312]
- State Key Basic Research Program of PRC [2007CB209703]
- Shanghai Science & Technology Committee [09XD1400300, 08DZ2270500]
The thermally-induced structural transformation of layered hydrogen trititanate (H2Ti3O7) to TiO2(B) has been systematically studied by means of in situ X-ray diffraction (XRD) over a wide temperature range from 170 to 450 degrees C. Our data indicate a structural transition realized via continuous loss of interlayer water, which results in a series of non-stoichiometric hydrogen titanate compounds (3TiO(2)center dot delta H2O). Electrochemical analysis of hydrogen titanates for lithium-ion intercalation shows that reversible specific capacity increases as calcination temperature increases, whereas cycling stability decreases during the continuous dehydration process. (C) 2010 Elsevier B.V. All rights reserved.
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