Ultrafine Copper Nanopalm Tree‐Like Framework Decorated with Iron Oxide for Li‐Ion Battery Anodes with Exceptional Rate Capability and Cycling Stability. Issue 13 (14th February 2019)

• Record Type: Journal Article
• Authors: Seok, Jae Young; Lee, Jaehak; Park, Jung Hwan; Yang, Minyang
• Is Part Of: Advanced energy materials. Volume 9:Issue 13(2019)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2019-02-14
• Subjects: copper electrodes -- high‐rate charging -- iron oxides -- lithium ion batteries -- nanostructures; Energy harvesting -- Materials -- Periodicals; Energy conversion -- Materials -- Periodicals; Energy storage -- Materials -- Periodicals; Photovoltaics -- Periodicals; Fuel cells -- Periodicals; Thermoelectric materials -- Periodicals; 621.31
• DOI: 10.1002/aenm.201803764
• Languages: English
• ISSNs: 1614-6832

Abstract

Abstract: Ultrafine copper nanopalm tree‐like frameworks conformally decorated with iron oxide (Cu NPF@Fe2 O3 ) 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@Fe2 O3 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@Fe2 O3 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). Abstract : An ultrafine copper nanopalm tree‐like framework (Cu NPF) having a thin diameter (≈85 nm) and elongated (2–50 µm) branches is prepared by facile one‐step electrodeposition utilizing bromine as an anisotropic growth catalyst. The palm tree‐like Cu architecture significantly enhances the electrochemical kinetics; the resulting structured electrode demonstrated high specific capacity, and outstanding rate capability and cycling stability.