Though 2D transition metal dichalcogenides have attracted a lot of attention in energy-storage applications, the applications of NbSe for Li storage are still limited by the unsatisfactory theoretical capacity and uncontrollable synthetic approaches. Herein, a controllable oil-phase synthetic route for preparation of NbSe nanoflowers consisted of nanosheets with a thickness of ∼10 nm is presented. Significantly, a part of NbSe can be further replaced by orthorhombic CoSe nanoparticles via a post cation exchange process, and the predominantly 2D nanosheet-like morphology can be well-maintained, resulting in the formation of CoSe-decorated NbSe (denoted as CDN) nanosheets. More interestingly, the CDN nanosheets exhibit excellent lithium-ion battery performance. For example, it achieves a highly reversible capacity of 280 mAh g at 10 A g and long cyclic stability with specific capacity of 364.7 mAh g at 5 A g after 1500 cycles, which are significantly higher than those of reported pure NbSe.
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