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The behavior of the electrolyte anion, tetrafluoroborate (BF4-), in an electric double-layer capacitor was studied by solid state 11 B NMR using two activated carbons of medium (M500) and large (M3000) surface area, which show capacitance of 35F/ml and 20F/ml by charging at 2.7V, respectively. Magic angle spinning (MAS) 11 B NMR distinguishes two species (A and B) on the carbons at...
Raw needle coke from coal tar pitch was activated with K 2 CO 3 at a coke:carbonate weight ratio of 1:4, to prepare an electrode for an electric double-layer capacitor (EDLC). Although the surface area of the coke activated at 900°C for 3h was as small as 20m 2 /g, with a very high yield, the coke achieved capacitances per weight and volume of 20F/g and 20F/ml, respectively,...
Four kinds of anthracites from different regions were investigated as anodic materials of Li ion secondary battery by varying their calcination temperatures. Hon-gye anthracite calcined at 1000-1150 o C showed a high reversible capacity at low potential region of 0-0.12V, which is typical with hard carbon. The highest capacity of 370mAh/g was obtained with the Hon-gye among anthracites calcined...
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