This article reviews the literature reported during 2011 on battery and solid oxide fuel cell materials. The review focuses in particular on anode, cathode and electrolyte materials for metal ion batteries such as lithium, sodium and magnesium, and on oxide and proton conducting electrolytes as well as anode and cathode materials used in solid oxide fuel cell applications. Highlights In the battery material field, a key highlight was the prediction of a novel layered cathode material LiBC with a theoretical energy of 1088 mW h g À1 and a volumetric energy density of 2463 W h l À1 , with less than 3% volume change upon lithiation and delithiation. A second highlight was the discovery of a novel fast lithium ion conduct Li 10 GeP 2 S 12 which exhibits a conductivity of 12 mS cm À1 at room temperature, which is the highest conductivity for a solid state ionic conductor so far. In the solid oxide fuel cell materials field, a key highlight has been the novel exploitation of cation diffusion strategies to synthesise electrolyte materials, such as c-axis orientated apatite silicate, and dense Y-doped BaZrO 3 films.
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