Nanotechnology 2020 May 22;3121:215405. doi: 10.1088/1361-6528/ab71b7.

The improved anode performance enabled by Ni2P@C embedded in echinus-like porous carbon for lithium-ion battery.

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Nickel phosphides (Ni2P) have been proposed as advanced anode materials for a lithium-ion battery (LIB) due to its high capacity and electrochemical activity. However, the large volume expansion and poor cycling stability limit the practical applications of a Ni2P based LIB. In this work, we report a one-step strategy to prepare Ni2P@C nanoparticles embedded in echinus-like porous carbon (Ni2P@C@EPC) as a promising anode for LIB. It is demonstrated that the Ni2P@C@EPC corresponds the hexagonal Ni2P phase very well. The Raman spectrum indicates that the defective carbon is dominant in Ni2P@C@EPC. Moreover, Ni2P@C@EPC possesses a high specific surface area of 372.953 cm2 · g-1 with an average pore size of 6.496 nm. Remarkably, the EPC plays a significant role in realizing high and stable performance by confining the reaction between Ni2P and Li+, facilitating Li+ diffusion mobility and inhibiting the volume change in charge/discharge. As a result, the Ni2P@C@EPC delivers a high specific capacity of 807.7 mAh · g-1 at 0.2 A · g-1, excellent rate capability (592.1, 455.9, 346.1, 236.4 and 160.69 mAh · g-1 at 0.1, 0.2, 0.5, 1.0 and 2.0 A · g-1), and long cycling stability (464.8 mAh · g-1 at 0.2 A · g-1 after 100 cycles). Moreover, the structure evolution upon cycling as well as electrochemical analysis has verified the superiority of Ni2P@C@EPC anode.

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Genes referenced: LOC115925415 LOC576114