Nitrogen-doped-carbon-coated SnO2 nanoparticles derived from a SnO2@MOF composite as a lithium ion battery anode material

Abstract

N-Doped-carbon-coated 2–4 nm SnO₂ nanoparticles were synthesized via a facile metal–organic framework (MOF) coating process followed by a calcination of the SnO₂@MOF composite. The as-prepared SnO₂ nanoparticles are well dispersed and coated with a uniform nitrogenous carbon structure, which can effectively prevent volume expansion during discharge and charge processes. Benefiting from the advantages of a synergistic effect of SnO₂ nanoparticles and carbon structure, these materials exhibit excellent electrochemical performance. For the optimized material SOC-3, a reversible specific capacity of 1032 mA h g⁻¹ was maintained at 100 mA g⁻¹ after 150 cycles with a coulombic efficiency of 99%. When the current was increased to 500 mA g⁻¹, a capacity of 600 mA h g⁻¹ was still attained.