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Transition metal phosphides (TMPs) are promising anode candidates for sodium-ion batteries, due to their high theoretical specific capacity and working potential. However, the low conductivity and excessive volume variation of TMPs during insertion/extraction of sodium ions result in a poor rate performance and long-term cycling stability, largely limiting their practical application. In this paper, NiP2 nanoparticles encapsulated in three-dimensional graphene (NiP2 @rGO) were obtained from the flower-like spherical α-Ni(OH)2 by phosphat
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