Engineered Changes in Structure and Component from Solid NiS₂/Reduced Graphene Oxide to Hollow Ni‐P/Reduced Graphene Oxide and the Enhanced Performance for Lithium‐Ion Batteries

Abstract

Using a phosphorization strategy combined with the annealing process, hollow Ni‐P octahedrons/reduced graphene oxide (H‐Ni‐P/rGO) nanocomposites are synthesized. As an anode material for lithium‐ion batteries (LIBs), the nanocomposite exhibits excellent electrochemical performance. The enhanced performance can be ascribed to the advantageous structural design of the composite. The electrochemical conductivity of the material is improved by introducing rGO into the composite. The contact area of the electrode/electrolyte is enlarged, the diffusion path of Li+/electrons is shortened, and the volume changes are remitted during the cycle process because of the Ni‐P hollow structure in the composite. As the anode of H‐Ni‐P/rGO nanocomposite for LIBs, the discharge capacity is 504.1 mAh g−1 after 100 cycles at a current density of 100 mA g−1 and the capacity is still 384.8 mAh g−1 even after 500 cycles at a current density of 1000 mA g−1.

Nickel‐Based Materials for Advanced Rechargeable Batteries

“…NiX can be well-distributed in the compact carbon fiber matrix, [64,73,74,78,119,120] encapsulated in carbon networks [77,81,121] or CNTs, [66,68,69,78] and graphene supported NiX nanostructures. [75,82,95,[122][123][124][125] Both integrated carbon matrix and carbon structures with porous [78,126] or hollow [79] properties can effectively alleviate the volume change during cycling. N, S co-doped carbon wrapped Ni 3 S 2 (Ni 3 S 2 @NSC) nanotubes (≈400 nm) were obtained by two steps: Using polyacrylonitrile nanofibers as template to fabricate NiS 2 and NiS 2 acts as both a precursor of Ni 3 S 2 and a sulfur source for doping carbon (Figure 4a).…”

“…NiX can be well‐distributed in the compact carbon fiber matrix, [ 64,73,74,78,119,120 ] encapsulated in carbon networks [ 77,81,121 ] or CNTs, [ 66,68,69,78 ] and graphene supported NiX nanostructures. [ 75,82,95,122–125 ] Both integrated carbon matrix and carbon structures with porous [ 78,126 ] or hollow [ 79 ] properties can effectively alleviate the volume change during cycling.…”