Te-Doped Bi2Se3@NC Nanocomposites for High-Performance Li-Ion Battery Anodes

Abstract

Bismuth-based anodes are promising for lithium-ion batteries owing to their high theoretical capacity, garnering significant attention in recent decades. Despite its intrinsic advantages, this anode material has the shortcoming of excessive volume expansion during the charging and discharging processes, which significantly reduces the cycling stability. In this work, a nitrogen-doped carbon-coated Bi2Se3−xTex composite (Bi2Se3−xTex@NC) with excellent electrochemical properties was synthesized by the solvothermal method followed by heat treatment. Benefiting from its unique structure and Te-doping properties, the nitrogen-doped carbon-coated Bi2Se3−xTex composite maintains a discharge specific capacity of 464.0 mAh g−1 after 60 cycles at a current density of 0.1 A g−1. This research presents an efficient approach for the preparation of nitrogen-doped carbon-coated anode materials and a fresh perspective on battery electrode material design.