Abstract
The intercalation reaction of lithium in hydrogen phthalocyanine, H 2C 32N 8H 16, (H 2Pc) has been studied in a propylene carbonate (PC) electrolyte containing LiClO 4. The theoretical specific capacity and energy of the H 2Pc/Li system are very high (870 A h/kg and 1190 W h/kg). The lithium diffusion coefficient in this material was determined from the first discharge depths and NMR measurements. Experimental results gave a D Li+ value of around 4 × 10 −12 cm 2 s −1. Using NMR techniques, the variations of relaxation time, τ 2, with temperature were studied for H 2Pc treated with n-butyllithium. The diffusion coefficient in this case is 5 × 10 −10 cm 2 s −1.
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