title: MCNTs@MnO2Nanocomposite Cathode Integrated with Soluble O2-Carrier Co-salen in Electrolyte for High-Performance Li-Air Batteries.
abstract: Li-air batteries (LABs) are promising because of their high energy density. However, LABs are troubled by large electrochemical polarization during discharge and charge, side reactions from both carbon cathode surface/peroxide product and electrolyte/superoxide intermediate, as well as the requirement for pure O2. Here we report the solution using multiwall carbon nanotubes (MCNTs)@MnO2nanocomposite cathode integrated with N,N'-bis(salicylidene)ethylenediaminocobalt(II) (CoII-salen) in electrolyte for LABs. The advantage of such a combination is that on one hand, the coating layer of δ-MnO2with about 2-3 nm on MCNTs@MnO2nanocomposite catalyzes Li2O2decomposition during charge and suppresses side reactions between product Li2O2and MCNT surface. On the other hand, CoII-salen works as a mobile O2-carrier and accelerates Li2O2formation through the reaciton of (CoIII-salen)2-O22-+ 2Li++ 2e-→ 2CoII-salen + Li2O2. This reaction route overcomes the pure O2limitation and avoids the formation of aggressive superoxide intermediate (O2-or LiO2), which easily attacks organic electrolyte. By using this double-catalyst system of Co-salen/MCNTs@MnO2, the lifetime of LABs is prolonged to 300 cycles at 500 mA g-1(0.15 mA cm-2) with fixed capacity of 1000 mAh g-1(0.30 mAh cm-2) in dry air (21% O2). Furthermore, we up-scale the capacity to 500 mAh (5.2 mAh cm-2) in pouch-type batteries (∼4 g, 325 Wh kg-1). This study should pave a new way for the design and construction of practical LABs.
authors.affiliation: Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education) and State Key Laboratory of Elemento-Organic Chemistry, Collaborative Innovation Center of Chemical Science and Engineering, College of Chemistry, Nankai University , Tianjin 300071, China.
authors.forename: Xiaofei
authors.initials: X
authors.lastname: Hu
authors.affiliation: Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education) and State Key Laboratory of Elemento-Organic Chemistry, Collaborative Innovation Center of Chemical Science and Engineering, College of Chemistry, Nankai University , Tianjin 300071, China.
authors.forename: Jianbin
authors.initials: J
authors.lastname: Wang
authors.affiliation: Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education) and State Key Laboratory of Elemento-Organic Chemistry, Collaborative Innovation Center of Chemical Science and Engineering, College of Chemistry, Nankai University , Tianjin 300071, China.
authors.forename: Zifan
authors.initials: Z
authors.lastname: Li
authors.affiliation: Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education) and State Key Laboratory of Elemento-Organic Chemistry, Collaborative Innovation Center of Chemical Science and Engineering, College of Chemistry, Nankai University , Tianjin 300071, China.
authors.forename: Jiaqi
authors.initials: J
authors.lastname: Wang
authors.affiliation: School of Chemistry, University of Glasgow , University Avenue, Glasgow G12 8QQ, United Kingdom.
authors.forename: Duncan H
authors.initials: DH
authors.lastname: Gregory
authors.affiliation: Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education) and State Key Laboratory of Elemento-Organic Chemistry, Collaborative Innovation Center of Chemical Science and Engineering, College of Chemistry, Nankai University , Tianjin 300071, China.
authors.forename: Jun
authors.initials: J
authors.lastname: Chen
keywords: Nanocomposite catalysts; O2-carrier Co-salen; lithium−air batteries; oxygen partial pressure; side reactions