title: MWCNT/V2O5 core/shell sponge for high areal capacity and power density Li-ion cathodes.
abstract: A multiwall carbon nanotube (MWCNT) sponge network, coated by ALD V(2)O(5), presents the key characteristics needed to serve as a high-performance cathode in Li-ion batteries, exploiting (1) the highly electron-conductive nature of MWCNT, (2) unprecedented uniformity of ALD thin film coatings, and (3) high surface area and porosity of the MWCNT sponge material for ion transport. The core/shell MWCNT/V(2)O(5) sponge delivers a stable high areal capacity of 816 μAh/cm(2) for 2 Li/V(2)O(5) (voltage range 4.0-2.1 V) at 1C rate (1.1 mA/cm(2)), 450 times that of a planar V(2)O(5) thin film cathode. At much higher current (50×), the areal capacity of 155 μAh/cm(2) provides a high power density of 21.7 mW/cm(2). The compressed sponge nanoarchitecture thus demonstrates exceptional robustness and energy-power characteristics for thin film cathode structures for electrochemical energy storage.
authors.affiliation: Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, United States.
authors.forename: Xinyi
authors.initials: X
authors.lastname: Chen
authors.forename: Hongli
authors.initials: H
authors.lastname: Zhu
authors.forename: Yu-Chen
authors.initials: YC
authors.lastname: Chen
authors.forename: Yuanyuan
authors.initials: Y
authors.lastname: Shang
authors.forename: Anyuan
authors.initials: A
authors.lastname: Cao
authors.forename: Liangbing
authors.initials: L
authors.lastname: Hu
authors.forename: Gary W
authors.initials: GW
authors.lastname: Rubloff
mesh_terms: D000042:Absorption; D011211:Electric Power Supplies; D004566:Electrodes; D004735:Energy Transfer; D004867:Equipment Design; D019544:Equipment Failure Analysis; D007477:Ions; D008094:Lithium / Q000737:chemistry* / Q000302:isolation & purification*; D037742:Nanotubes, Carbon / Q000737:chemistry* / Q000648:ultrastructure*; D016062:Porosity; D017968:Vanadium Compounds / Q000737:chemistry*
chemical_list: D007477:Ions; D037742:Nanotubes, Carbon; D017968:Vanadium Compounds; D008094:Lithium; C066075:vanadium pentoxide