Abstract
A facile, one-pot hydrothermal method was used to synthesize Nickel selenide (NiSe) nanoparticles decorated with reduced graphene oxide nanosheets (rGO), denoted as NiSe/rGO. The NiSe/rGO exhibits good electrochemical performance when tested as anodes for Na-ion batteries (SIBs) and Li-ion batteries (LIBs). An initial reversible capacity of 423 mA h g−1 is achieved for SIBs with excellent cyclability (378 mA h g−1 for 50th cycle at 0.05 A g−1). As anode for LIBs, it delivers a remarkable reversible specific capacity of 1125 mA h g−1 at 0.05 A g−1. The enhanced electrochemical performance of NiSe/rGO nanocomposites can be ascribed to the synergic effects between NiSe nanoparticles and rGO, which provide high conductivity and large specific surface area, indicating NiSe/rGO as very promising Na/Li storage materials.
Highlights
Batteries are considered as very promising electrical energy storage technologies for integration of large-scale renewable energy
In order to satisfy the demand, intensive research has been concentrated on developing new type electrode materials with better cyclability and higher capacity. [1,2,3,4,5,6,7] With respect to the anodes, graphite is a popular candidate for lithium storage anode
Graphite is not able to serve as sodium storage anode due to the mismatch of lattice parameters and sluggish kinetics of large Na+ in graphite host. [8,9] developing high performance Na/Li storage anodes is of great significance
Summary
Batteries are considered as very promising electrical energy storage technologies for integration of large-scale renewable energy. Great efforts have been concentrated on seeking high theoretical capacity anode materials beyond graphite, including disordered carbon, [10,11,12] metal/alloy, [13,14,15,16] oxide [17,18,19], and sulfides. Transition metal selenides have very similar properties as transition metal sulfides, there are seldom report about transition metal selenides as anode materials for LIBs and SIBs. For example, Zhang et al prepared FeSe2 microspheres which delivered a stable capacity of 372 mA h g−1 after 2000 cycles at 1 A g−1 for sodium storage. NiSe/rGO nanocomposites exhibit a good sodium-storage and lithium-storage performance, offering a low cost and high performance anode material for Na/Li-ion batteries
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