期刊
RSC ADVANCES
卷 6, 期 99, 页码 96714-96720出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6ra21006f
关键词
-
资金
- National Natural Science Foundation of China [51672071, 21203056, 21303042]
- National High Technology Research and Development Program [2013AA032002, 2015AA034601]
- Key Scientific Research Project of Henan Province [15A150056]
- Program for Innovative Research Team in University of Henan Province [17IRTSTHN001]
- Beijing National Laboratory for Molecular Sciences [20140144]
- Xinxiang key scientific and technological projects [ZG15004]
Compared to commercialized cathode materials, Li-rich layered oxide exhibits a superior mass energy density. However, owing to its low tap/press density, the advantage of its volume energy density is not as obvious as that of its mass energy density, which limits its applications in some volume-constrained fields. It has been shown that the morphology of the precursor is critical to the performances of the final product. Here, solvothermal and co-precipitation methods were adopted to synthesize transition metal carbonate balls with micro-size particles to obtain high-density Li-rich layered oxides. The solvothermal synthesized carbonate showed a micro-nano hierarchical structure composed of nanoplates as subunits, and the co-precipitated synthesized carbonate just presents a micrometer quasi-ball morphology. The Li1.2Mn0.54Ni0.13Co0.13O2 derived from the above solvothermal synthesized carbonate (ST-LMNCO) demonstrated an improved volume density of similar to 14% compared to the one derived from the co-precipitated synthesized carbonate (CP-LMNCO). As for electrochemical performances, the ST-LMNCO exhibited a higher discharge specific capacitance (296.6mA h g(-1) for the first discharge), a better rate performance (201.6 mA h g(-1) at 1C rate) and a better capacity retention capability (86.2% after 80 cycles) than the CP-LMNCO. The morphologies of the transition metal carbonates as starting materials significantly impacted the morphologies of the derived Li-1.2Mn0.54Ni0.13Co0.13O2 particles. Therefore, the carbonate with a hierarchical micro-nanostructure obtained from the solvothermal method is a promising precursor for high performance Li1.2Mn0.Ni-54(0).13Co0.13O2.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据