Synthesis and electrochemical performance of Ag nanowires coating tungsten diselenide as efficient nanocomposite for lithium-ion storage

摘要

A nanocomposite (AgNWs@WSe2) consisting of tungsten diselenide (WSe2) nanosheets decorated with silver nanowires (AgNWs) was synthesized by a simple solvothermal method. In order to investigate its lithium-ion storage performance, AgNWs act as an effective backbone for the in-situ growth of WSe2 on its surface. Compared with pure tungsten diselenide electrode material, this composite material has more excellent multiplicative performance and long cycle stability(348.7 mAh g-1 at 1 A g-1 after 500 cycles). Additional results combined with COMSOL simulations further demonstrate the superior lithium performance of the composite electrode, mainly due to the typical one-dimensional AgNWs provide direct channels for electron transfer, slowing down the volume expansion during lithium ion embedding/detachment, and inhibit mechanical degradation, thus enabling longer cycling life.