Performance of MnO2 Crystallographic Phases in Rechargeable Lithium-Air Oxygen Cathode
Performance of MnO2 Crystallographic Phases in Rechargeable Lithium-Air Oxygen Cathode
复制标题
可充电锂空气氧阴极中MnO2晶相的性能
DOI：
10.1007/s11664-012-2046-1
复制
发表时间：
2012
影响因子：
2.1
通讯作者：
Oloniyo O
中科院分区：
文献类型：
--
作者：
Oloniyo O
二氧化锰（MnO 2）已被证明可有效提高锂空气电池中阴极的效率。采用水热法合成了不同晶相的α-、β-和γ-MnO 2纳米线、α-MnO 2纳米球和碳载α-MnO 2纳米线（α-MnO 2/C）。使用X射线衍射（XRD），Brunauer-Emmett-Teller（BET）表面积测量，和扫描电子显微镜（SEM），他们的物理性能进行了检查，发现与文献一致。通过制备阴极并在锂-空气电池中以六氟磷酸锂为电解液考察了合成的催化剂颗粒的电化学性能（LiPF 6/PC）和四氢呋喃乙二醇二甲醚（LiTFSi/TEGDME）电解质。在LiTFSi/TEGDME电解质中，α-MnO 2的放电容量最高（2500 mAh/g），而LiPF 6/PC中的α-MnO 2/C显示出显著更高的放电容量，基于催化阴极的总质量为11，000 mAh/g。但后者的容量保持率低于γ-MnO 2纳米线，后者可稳定循环30次。所报道的放电容量高于先前关于锂空气电池的研究中所记录的。
Manganese dioxide (MnO2) has been shown to be effective for improving the efficiency of cathodes in lithium-air cells. Different crystallographic phases includingα-,β-, andγ-MnO2nanowires,α-MnO2nanospheres, and α-MnO2nanowires on carbon (α-MnO2/C) were synthesized using the hydrothermal method. Their physical properties were examined using x-ray diffraction (XRD), Brunauer–Emmett–Teller (BET) surface area measurements, and scanning electron microscopy (SEM) and found to be in agreement with the literature. Electrochemical properties of the synthesized catalyst particles were investigated by fabricating cathodes and testing them in a lithium-air cell with lithium hexafluorophosphate in propylene carbonate (LiPF6/PC) and tetra(ethylene glycol)dimethyl ether (LiTFSi/TEGDME) electrolytes.α-MnO2had the highest discharge capacity in the LiTFSi/TEGDME electrolyte (2500 mAh/g), whilstα-MnO2/C in LiPF6/PC showed a significantly higher discharge capacity of 11,000 mAh/g based on total mass of the catalytic cathode. However, the latter showed poor capacity retention compared withγ-MnO2nanowires, which was stable for up to 30 cycles. The reported discharge capacity is higher than recorded in previous studies on lithium-air cells.
影响因子：
15
作者：
Ogasawara, T;Débart, A;Bruce, PG
通讯作者：
Bruce, PG
影响因子：
16.6
作者：
Debart, Aurelie;Paterson, Allan J.;Bruce, Peter G.
通讯作者：
Bruce, Peter G.