Synthesis and electrochemical characteristics of oligo[{3,4-diphenyl-1,1-di(propan-2-yl)-2,5-silolene}-co-(diphenylsilylene)] for lithium-ion secondary battery anodes

다국어 초록 (Multilingual Abstract)

The co-oligomerization of 2,5-dibromo-3,4-diphenyl-1,1-di(propan-2-yl)-silole (3) with dichlorodiphenylsilane was carried out using n-butyllithium at ?78°C to synthesize oligo[{3,4-diphenyl-1,1-di(propan-2-yl)-2,5-silolene}-co-(diphenylsilylene)] (5) as yellowish-white powder, with a mass-average molar mass of 561, polydispersity of 1.01, ?abs,max of 260 and 279?nm, ?ex,max of 296?nm, ?em,max of 391?nm, and thermal stability up to 125°C without any weight loss. The rate performance obtained with oligomer 5 was superior to that obtained with monomer 3. The discharge and charge capacities with 5 were 1234 and 1263 mAhg?1, respectively, with Coulombic efficiency of 97.7% at the 100th cycle. Nyquist plots suggested that the resistance decreases gradually with repeated cycling.

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