Nana Wang , Xiaojian Ma , Huayun Xu , Liang Chen , Jie Yue , Feier Niu , Jian Yang , Yitai Qian
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引用次数: 150
摘要
通过溶剂热反应合成的金属碳酸盐,煅烧制备了高质量的多孔ZnMn2O4微球。通过XRD、SEM、TEM和HRTEM对多孔微球进行了表征,揭示了微球的晶相和颗粒形貌。ZnMn2O4微球的多孔结构和纳米级结构使其成为锂离子电池极具前景的负极材料。在500 mA g−1的电流密度下循环300次后,它们仍然保持800 mAh g−1的可逆容量。即使在2a g−1下,可逆容量也可以达到395 mAh g−1,高于石墨的理论容量。优异的电化学性能可能与多孔结构和纳米级构建块有关,它们促进了电解质和电极之间的接触,适应了放电/充电过程中的体积变化,并为锂存储提供了大量的活性表面位点。
Porous ZnMn2O4 microspheres as a promising anode material for advanced lithium-ion batteries
High-quality porous ZnMn2O4 microspheres composed of interconnected nanoparticles have been achieved by calcination of metal carbonates synthesized by a solvothermal reaction. The porous microspheres are characterized by XRD patterns, SEM, TEM, and HRTEM images to reveal the crystal phase and particle morphology. The porous structure and nanoscale building blocks of ZnMn2O4 microspheres make them a promising anode material for lithium ion batteries. After 300 cycles at a current density of 500 mA g−1, they still preserve a reversible capacity of 800 mAh g−1. Even at 2 A g−1, the reversible capacity could be 395 mAh g−1, higher than the theoretical capacity of graphite. The superior electrochemical performances can be associated with the porous structure and nanoscale building blocks, which promote the contacting between electrolyte and electrode, accommodate volume change during discharge/charge processes, and provide a large number of active surface sites for lithium storage.
期刊介绍:
Nano Energy is a multidisciplinary, rapid-publication forum of original peer-reviewed contributions on the science and engineering of nanomaterials and nanodevices used in all forms of energy harvesting, conversion, storage, utilization and policy. Through its mixture of articles, reviews, communications, research news, and information on key developments, Nano Energy provides a comprehensive coverage of this exciting and dynamic field which joins nanoscience and nanotechnology with energy science. The journal is relevant to all those who are interested in nanomaterials solutions to the energy problem.
Nano Energy publishes original experimental and theoretical research on all aspects of energy-related research which utilizes nanomaterials and nanotechnology. Manuscripts of four types are considered: review articles which inform readers of the latest research and advances in energy science; rapid communications which feature exciting research breakthroughs in the field; full-length articles which report comprehensive research developments; and news and opinions which comment on topical issues or express views on the developments in related fields.