31 Oct '13, 10am

New Electrode Made From Iron Oxide Nanoparticles Boosts Battery Capacity

New Electrode Made From Iron Oxide Nanoparticles Boosts Battery Capacity

The researchers made 5-nanometer-wide particles of an iron oxide known as α-Fe2O3, simply by heating iron nitrate in water. They mixed the particles with a dust called carbon black, bound them together with polyvinylidene fluoride and coated the mixture onto copper foil to make their anodes. During the first round of charging and discharging, the anodes showed an efficiency of 75-78%, depending on the current density used. After ten more cycles, however, the efficiency improved to 98%, almost as high as commercial lithium-ion batteries. Research by other teams suggests that during the first few cycles, the iron oxide nanoparticles are broken down until they reach an optimum size. After 230 cycles the anode’s efficiency remained at 97%, with a capacity of 1,009 milliamp hours per gram (mA h g−1 ) — almost three times greater than commercial graphite anodes. The material exp...

Full article: http://cleantechnica.com/2013/10/31/new-electrode-made-ir...

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