期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 4, 期 43, 页码 16936-16945出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6ta06933a
关键词
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资金
- National Key Research and Development Program of China [2016YFA0202603]
- National Natural Science Foundation of China [51372186]
MnO anode materials with high energy densities for lithium-ion batteries (LIBs) face significant challenges in avoiding inferior reversible capacity and fast capacity fading. Here we demonstrate a facile and scalable approach to realizing excellent performance, overcoming such disadvantages. A well-connected threedimensional (3D) hierarchical porous-conducting framework, consisting of MnO nanorods conformally encapsulated by a nitrogen-doped carbon network, was synthesized via an in situ polymerization of polyaniline into manganese dioxide along with thermal calcination. Such a structure possesses a continuous electrically conductive carbon network with porous spaces for volume expansion of MnO rods, and the carbon coating on the nanorods further alleviates pulverization and self-aggregation of the active materials. As an anode, it demonstrates a reversible capacity as high as 798.6 mA h g(-1) after 5 cycles at 50 mA g(-1), beyond the theoretical capacity of MnO, and an extremely stable cycle life of 3000 cycles with similar to 95% capacity retention, even at a high current density of 4000 mA g(-1). Significantly, the electrochemical behavior of this novel material was also probed by an in situ XRD technique.
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