Construction of a carbon encapsulated SnSe–CoSe2 composite for high-performance lithium ion storage

Abstract

Carbon-coated SnSe–CoSe₂ composites were synthesized and show superior lithium ion storage performance, including high specific capacity (963.3 mAh g⁻¹ at 0.2 A g⁻¹), super rate capability (700.2 mAh g⁻¹ at 1.0 A g⁻¹), and long-term cycling stability (1000 cycles). Cyclic voltammetry verifies dominant pseudocapacitive contributions to the charge storage mechanism.