Synthesis of nanocrystalline VO{sub 2} and its electrochemical behavior in lithium batteries
- Univ. of Texas, Austin, TX (United States). Center for Materials Science and Engineering
Nanocrystalline VO{sub 2} having a metastable shear structure, designated as VO{sub 2}(B), has been synthesized by a simple chemical method. The procedure involves a reduction of aqueous potassium vanadate solution with potassium borohydride around pH 4. The sample has been characterized by x-ray diffraction, differential scanning calorimetry, thermogravimetric analysis, and transmission electron microscopy. The metastable VO{sub 2}(B) begins to transform irreversibly to the more stable monoclinic rutile VO{sub 2} around 350 C and the transformation is complete around 500 C. VO{sub 2}(B) exhibits a maximum reversible capacity of about 30 mAh/g in the range 4 to 1 V in lithium cells. A good capacity retention on cycling makes it an attractive cathode for rechargeable lithium cells. In addition, the excellent cyclability without any capacity decline around an intermediate 2.5 V range may become particularly useful for the recently suggested aqueous lithium-ion cells consisting of VO{sub 2}(B) anode and LiMn{sub 2}O{sub 4} cathode.
- Sponsoring Organization:
- National Science Foundation, Washington, DC (United States); Welch (Robert A.) Foundation, Houston, TX (United States)
- OSTI ID:
- 465097
- Journal Information:
- Journal of the Electrochemical Society, Vol. 144, Issue 2; Other Information: PBD: Feb 1997
- Country of Publication:
- United States
- Language:
- English
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