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Morphology‐Tuned Synthesis of NiCo 2 O 4 ‐Coated 3D Graphene Architectures Used as Binder‐Free Electrodes for Lithium‐Ion Batteries
Author(s) -
Zhang Chunfei,
Yu JongSung
Publication year - 2016
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201504386
Subject(s) - materials science , graphene , electrode , electrolyte , current collector , anode , lithium (medication) , chemical engineering , annealing (glass) , lithium ion battery , nanotechnology , battery (electricity) , composite material , chemistry , medicine , power (physics) , physics , quantum mechanics , endocrinology , engineering
Nanostructured NiCo 2 O 4 is directly grown on the surface of three‐dimensional graphene‐coated nickel foam (3D‐GNF) by a facile electrodeposition technique and subsequent annealing. The resulting NiCo 2 O 4 possesses a distinct flower or sheet morphology, tuned by potential or current variation electrodeposition, which are used as binder‐free lithium‐ion battery anodes for the first time. Both samples exhibit high lithium storage capacity, profiting from the unique binder‐free electrode structures. The flower‐type NiCo 2 O 4 demonstrates high reversible discharge capacity (1459 mAh g −1 at 200 mA g −1 ) and excellent cyclability with around 71 % retention of the reversible capacity after 60 cycles, which are superior to the sheet‐type NiCo 2 O 4 . Such superb performance can be attributed to high volume utilization efficiency with unique morphological character, a well‐preserved connection between the active materials and the current collector, a short lithium‐ion diffusion path, and fast electrolyte transfer in the binder‐free NiCo 2 O 4 ‐coated 3D graphene structure. The simple preparation process and easily controllable morphology make the binder‐free NiCo 2 O 4 /3D‐GNF hybrid a potential material for commercial applications.