Abstract
Nanosized metal particles are currently used in the development of high-capacity metal-based negative electrodes for Li-ion batteries. Here, we report on a new strategy that uses 6-mercaptopurine-monolayer protected gold clusters (6MP-MPCs) as an electrode for a lithium battery. The higher performance of the Li/6MP-MPC as compared to the Li/2D-Au cell (the latter consists of naked gold microparticles composed of nanocrystallites of around 17 nm in size) is explained on the basis of the three-dimensional organization of the 6MP-MPCs in the powder sample. The cell specific capacity of the Li/6MP-MPC is kept on extended cycling in contrast to the behavior observed for the Li/2D-Au cell that shows an abrupt decay of this magnitude after a few cycles. The reorganization of the 6MP molecular layer on the lithium−gold alloying process allows the accommodation of the increased cores in the same space volume, avoiding the cracks in the electrode, thus, keeping the electronic conduction.
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