Premium
Ultrafine Copper Nanopalm Tree‐Like Framework Decorated with Iron Oxide for Li‐Ion Battery Anodes with Exceptional Rate Capability and Cycling Stability
Author(s) -
Seok Jae Young,
Lee Jaehak,
Park Jung Hwan,
Yang Minyang
Publication year - 2019
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201803764
Subject(s) - materials science , electrochemistry , anode , copper , chemical engineering , oxide , copper oxide , cycling , ion , electron transfer , battery (electricity) , electrode , metallurgy , photochemistry , chemistry , power (physics) , physics , archaeology , quantum mechanics , engineering , history
Ultrafine copper nanopalm tree‐like frameworks conformally decorated with iron oxide (Cu NPF@Fe 2 O 3 ) are prepared by a facile electrodeposition method utilizing bromine ions as unique anisotropic growth catalysts. The formation mechanism and control over Cu growth are comprehensively investigated under various conditions to provide a guideline for fabricating a Cu nanoarchitecture via electrochemical methods. The optimized Cu NPFs exhibit ultrathin (<90 nm) and elongated (2–50 µm) branches with well‐interconnected and entangled features, which result in highly desirable attributes such as a large specific surface area (≈6.97 m 2 g −1 ), free transfer pathway for Li + , and high electrical conductivity. The structural advantages of Cu NPF@Fe 2 O 3 enhance the electrochemical kinetics, providing large reactivity, fast Li + /electron transfer, and structural stability during cycling, that lead to superior electrochemical Li storage performance. The resulting Cu NPF@Fe 2 O 3 demonstrates a high specific capacity (919.5 mAh g –1 at 0.1 C), long‐term stability (801.1 mAh g –1 at 2 C, ≈120% retention after 500 cycles), and outstanding rate capability (630 mAh g –1 at 10 C).