In-situ Preparation and Electrochemical Properties of Non-woven Flexible Silicon Anode

Silicon anode materials pulverization and deciduation from the collector can lead to the battery capacity fast attenuation and low conductivity due to the volume expansion of silicon during the lithiation/delithiation process. We prepared a kind of non-woven flexible silicon-based anode by an in-situ electrospinning method with nanosilicon self-controlled, and investigated the morphology, structure and electrochemical performance. The results show that the prepared non-woven silicon-based anode has a superior flexibility, and carbon after polyvinyl pyrrolidone cracking mainly exists in the form of amorphous carbon. The Si/C composite silicon-based anode fiber film has a high specific surface area and a structure with massive mesopores, and the first-cycle discharge capacity can reach 2086.7 mA·h/g at a charge-discharge current density of 0.1 A/g, the initial Coulomb efficiency is 81.1%, and the discharge capacity can still maintain > 500 mA·h/g after 100 cycles.