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Traditional cobalt selenides as active materials in lithium-ion batteries(LIBs) and sodium-ion batteries (SIBs) would suffer from drastic volumeexpansions and large stacking effects, leading to a low cycling stability. Inthis work, we utilized a facile template method for preparing Co3Se4@N-CN(CSNC) that encapsulated Co3Se4 nanoparticles into 3D interconnectednitrogen-doped carbon network (N-CN). Satisfactorily, it possesses excellentcycling stability with enhanced lithium and sodium energy storage capacity. Asan anode material in LIBs, CSNC exhibited a prominent reversible dischargeperformance of 1313.5 mAh g-1 after 100 cycles at 0.1 A g-1 and 835.6 mAh g-1after 500 cycles at 1.0 A g-1. Interestingly, according to the analysis fromcyclic voltammetry, the in-situ generated Se might provide extra capacity thatleaded to a rising trend of capacity. When utilized as an anode in SIBs, CSNCdelivered an outstanding capacity of 448.7 mAh g-1 after 100 cycles at 0.1 Ag-1 and could retain 328.9 mAh g-1 (77.2% of that of 0.1 A g-1) even at a highcurrent density of 5.0 A g-1. The results demonstrate that CSNC is a superioranode material in LIBs and SIBs with great promise. More importantly, thisstrategy opens up an effective avenue for the design of transition metalselenide/carbonaceous composites for advanced battery storage systems.

Highly Conductive Co3Se4 Embedded in N-doped 3D Interconnected Carbonaceous Networks for Enhanced Lithium and Sodium Storage