Silicon and tin are interesting candidates for anode materials in Lithium ion batteries as they have some of the highest theoretical specific capacities (4200 mAh g-1 for silicon and 991 mAh g-1for tin).[1] This advantage is counteracted by a major volume expansion with subsequent contraction during lithiation and delithiation. This expansion is causing the electrode to pulverize, lose electrical contact and thus leading to a quick fade in capacity. Pulverization may be avoided when nanoparticles or nano-sized polymers are used as they are small enough to allow “active material breathing” and thus to evade a breakdown of the electrode.[2] Organosilicon and organotin hydrides have been studied as precursors in the formation of nano-sized polymeric materials which consist of a backbone of covalently bonded metal atoms.[3] These materials feature an increased degree of electron delocalization and may therefore be interesting for the use in charge-transfer devices and Li-ion batteries.[4] We focused on the synthesis, characterization and possible application of differently substituted arylsilicon and aryltin hydrides and their respective nanoparticles and nano-sized polymers.[5] Moreover we synthesized aryl-substituted silicon and tin hydrides of the types R3EH, R2EH2 and REH3 (R = phenyl, 1-naphthyl; E = Si, Sn) as precursor materials and characterized them using cyclic voltammetry. The precursors were then pyrolysed or polymerized, respectively, and the resulting nanoparticles were incorporated within anodes of Li-ion batteries. Herein we report first electrochemical characterization of differently aryl-substituted silicon and tin hydrides using cyclic voltammetry methods. Additionally, these precursor materials as well as their respective nanoparticles were tested as anode materials in Li-ion half-cells.