FeSe₂@reduced graphene oxide (rGO) composite was prepared by a facile one-step hydrothermal technique with FeSe₂ nanoparticles uniformly achored on rGO nanosheets. The nano-sized FeSe₂ particles effectively reduce the transfer length of Li ion and increase the sufficient contact area between the electrolyte and active material. Moreover, rGO can not only improve the electrical conductivity, but also prevent the agglomeration of nano-sized FeSe₂, as well as accommodate the volume expansion and strain generated from the charge/discharge process. As an anode material applied in Li-ion storage, FeSe₂/rGO composite delivers superior specific capacity of 1167.6 mAh/g, good cycling stability (908.2 mAh g⁻¹ after 120 cycles at the current density of 500 mA g⁻¹) and high-power characteristics (728.0 mAh g⁻¹ at 1000 mA g⁻¹), due to coexistent Li-ion storage mechanisms of surface capacitive behavior and diffusion-controlled process.

FeSe ₂ @还原氧化石墨烯 (rGO) 复合材料是通过简单的一步水热技术制备的，FeSe ₂纳米颗粒均匀地固定在 rGO 纳米片上。纳米尺寸的FeSe ₂颗粒有效地降低了锂离子的转移长度，增加了电解质与活性材料之间的充分接触面积。此外，rGO 不仅可以提高电导率，还可以防止纳米级 FeSe ₂的团聚，以及适应充放电过程中产生的体积膨胀和应变。作为应用于锂离子存储的负极材料，FeSe ₂ /rGO 复合材料具有 1167.6 mAh/g 的优异比容量，良好的循环稳定性（908.2 mAh g^-1在 500 mA g ^-1的电流密度下循环 120 次后）和高功率特性（728.0 mAh g ^-1在 1000 mA g ^-1），由于表面电容行为和扩散的共存锂离子存储机制-受控过程。