Crosslinking-derived MnO/carbon hybrid with ultrasmall nanoparticles for increasing lithium storage capacity during cycling
Crosslinking-derived MnO/carbon hybrid with ultrasmall nanoparticles for increasing lithium storage capacity during cycling
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DOI：
10.1016/j.carbon.2015.11.068
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发表时间：
2016-04-01
期刊：
影响因子：
10.9
通讯作者：
Zhang, Di
中科院分区：
文献类型：
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作者：
Kang, Danmiao;Liu, Qinglei;Zhang, Di
制备了嵌入多孔碳中的超小MnO纳米颗粒（5.2 nm）的MnO/C杂化材料，并将其用作锂离子电池负极材料。MnO/C混合电极在100 mA g（-1）的电流密度下表现出820 mAh g（-1）的优异比容量，并且在5000 mA g（-1）的电流密度下表现出483 mAh g（-1）的优异倍率性能。在1000 mA g（-1）下循环1000次后，比容量增加到1625 mAh g（-1）。TEM照片显示，在循环之后，颗粒破碎成2nm的颗粒。我们还应用XAFS检测混合电极中Mn的最终状态，发现较小的MnO颗粒被氧化为Mn2O3和MnO2的混合物。(C)2015爱思唯尔有限公司版权所有。
MnO/C hybrid with ultra-small MnO nanoparticles (5.2 nm) embedded in porous carbon is fabricated and applied as the anode material for lithium ion batteries. The MnO/C hybrid electrode exhibits excellent specific capacity of 820 mAh g(-1) at a current density of 100 mA g(-1) and also outstanding rate performance with specific capacity of 483 mAh g(-1) at a current density of 5000 mA g(-1). After cycling for 1000 times at 1000 mA g(-1), the specific capacity increases to 1625 mAh g(-1). The TEM photos show that the particles are broken into 2 nm particles after cycling. We also apply XAFS to detect the final state of the Mn in the hybrid electrodes and find that smaller MnO particles are oxidized to a mixture of Mn2O3 and MnO2. (C) 2015 Elsevier Ltd. All rights reserved.