30 Aug '16, 3pm

Zinc-ion cell lasts 1,000 cycles to 80%: Chemists at the University of Waterloo in Canada are claiming to hav...

Zinc-ion cell lasts 1,000 cycles to 80%: Chemists at the University of Waterloo in Canada are claiming to hav...

It is said to use non-flammable non-toxic materials and a pH-neutral water-based salt, consisting of a water-based electrolyte, a pillared vanadium oxide positive electrode and a metallic zinc negative electrode. Inside, positively-charged zinc ions are oxidized from the zinc metal negative electrode, travel through the electrolyte and insert between the layers of vanadium oxide nano-sheets in the positive electrode. The reverse process occurs on charge. “The cell represents the first demonstration of zinc ion intercalation in a solid state material that satisfies four vital criteria: high reversibility, rate and capacity, and no zinc dendrite formation,” said the University. “It provides more than 1,000 cycles with 80% capacity retention and an estimated energy density of 450Wh/litre.” Water in the electrolyte facilitates the movement of zinc ions, and swells the space be...

Full article: http://www.electronicsweekly.com/news/research-news/zinc-...

Tweets

NASA says Earth is warming at a rate 'unprecede...

inhabitat.com 30 Aug '16, 1pm

New data has confirmed that the Earth has been experiencing the hottest temperatures on record . The latest findings from ...