23 Jul '11, 12pm

Zinc tungstate nanorods show promise as higher-capacity anode materials for Li-ion batteries

Zinc tungstate nanorods show promise as higher-capacity anode materials for Li-ion batteries 23 July 2011 Researchers in S. Korea have synthesized a divalent wolframite-structure zinc tungstate (ZnWO4 ) in the form of one-dimensional nanorods; used as anode material in Li-ion batteries, the nanorods deliver reversibly sustained high capacities of more than 420 mAh g–1 after 150 cycles—much higher than the capacities of graphite-based anodes which are limited to 372 mAh g-1 . Wolframite, a principal ore of tungsten, is an iron and manganese tungstate mineral that is monoclinic, with tabular crystals. So far, research on metal oxides as anode materials has been focused on two approaches: those metal oxides that react with Li via the metal and subsequently form alloys (MO + 2Li→M + Li2 O and M + xLi+ + xe- ↔Lix M, alloying/dealloying reaction) and those that react with Li via...

Full article: http://www.greencarcongress.com/2011/07/tungstate-2011072...

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