title: Three dimensionally ordered mesoporous carbon as a stable, high-performance Li-O₂ battery cathode.
abstract: Enabled by the reversible conversion between Li2O2 and O2, Li-O2 batteries promise theoretical gravimetric capacities significantly greater than Li-ion batteries. The poor cycling performance, however, has greatly hindered the development of this technology. At the heart of the problem is the reactivity exhibited by the carbon cathode support under cell operation conditions. One strategy is to conceal the carbon surface from reactive intermediates. Herein, we show that long cyclability can be achieved on three dimensionally ordered mesoporous (3DOm) carbon by growing a thin layer of FeO(x) using atomic layer deposition (ALD). 3DOm carbon distinguishes itself from other carbon materials with well-defined pore structures, providing a unique material to gain insight into processes key to the operations of Li-O2 batteries. When decorated with Pd nanoparticle catalysts, the new cathode exhibits a capacity greater than 6000 mAh g(carbon) (-1) and cyclability of more than 68 cycles.
authors: Department of Chemistry, Merkert Chemistry Center, Boston College, 2609 Beacon St., Chestnut Hill, MA 02467 (USA).
authors: Jin
authors: J
authors: Xie
authors: Xiahui
authors: X
authors: Yao
authors: Qingmei
authors: Q
authors: Cheng
authors: Ian P
authors: IP
authors: Madden
authors: Paul
authors: P
authors: Dornath
authors: Chun-Chih
authors: CC
authors: Chang
authors: Wei
authors: W
authors: Fan
authors: Dunwei
authors: D
authors: Wang
keywords: atomic layer deposition; electrochemistry; energy storage; mesoporous materials; supported catalysts