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Engineered Changes in Structure and Component from Solid NiS 2 /Reduced Graphene Oxide to Hollow Ni‐P/Reduced Graphene Oxide and the Enhanced Performance for Lithium‐Ion Batteries
Author(s) -
Hu Weiwei,
Lyu Chaojie,
Gao Changzhong,
Wu Kaili,
Chen Lihui,
Zhu Xixi
Publication year - 2019
Publication title -
energy technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.91
H-Index - 44
eISSN - 2194-4296
pISSN - 2194-4288
DOI - 10.1002/ente.201900342
Subject(s) - graphene , materials science , anode , oxide , nanocomposite , electrochemistry , composite number , electrolyte , annealing (glass) , lithium (medication) , chemical engineering , current density , lithium ion battery , electrode , nanotechnology , composite material , battery (electricity) , metallurgy , chemistry , medicine , power (physics) , physics , quantum mechanics , endocrinology , engineering
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 .