Nano-sized FeSe2 anchored on reduced graphene oxide as a promising anode material for lithium-ion and sodium-ion batteries
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High-performance transition metal selenides are considered as promising electrode materials in alkali-ion batteries. However, the poor conductivity limits their further application. Herein, FeSe2 nanoparticles anchored on reduced graphene oxide (FeSe2@rGO) hybrid composites are prepared by a simple hydrothermal method and designed as promising anodes for lithium/sodium-ion batteries. The as-prepared FeSe2@rGO hybrids exhibit superior electrochemical performance with large reversible capacity and excellent cycling stability. In particular, the FeSe2@rGO electrodes deliver a specific capacity of 945.8 mAh g−1 for LIBs and a reversible capacity of 468.8 mAh g−1 for SIBs after 100 cycles at a current density of 100 mA g−1. Besides, the FeSe2@rGO electrodes demonstrate impressed rate capability and high ion diffusion coefficient. The results could enrich electrode materials synthesis methodologies and understand the complex charge–discharge process of metal selenides for next-generation batteries.
This work was supported by National Natural Science Foundation of China (Nos. 11374043, 11374223, 11705015), Natural Science Foundation of Jiangsu Educational Department (No. 15KJA430001), Foundation of Jiangsu science and Technology Department (No. BA2016041), Six-talent peak of Jiangsu Province (No. 2012-XCL-036), Science and Technology Development Plan Project in Suzhou (Nos. SYG201738, SYZ201710), and Scientific Research Foundation of University (Grant No. XZ1628).