材料科学
透射电子显微镜
球体
多孔性
化学工程
扫描电子显微镜
阴极
纳米颗粒
扩散
相(物质)
模板方法模式
纳米技术
化学
复合材料
物理化学
热力学
有机化学
物理
工程类
天文
作者
Wei Xiang,Enhui Wang,Mingzhe Chen,Huihui Shen,Shulei Chou,Hong Chen,Xiao-Dong Guo,Biao Zhong,Xin-Long Wang
标识
DOI:10.1016/j.electacta.2015.08.024
摘要
Porous hierarchical LiMn0.5Fe0.5PO4 spheres were synthesized via a novel template-engaged method using pre-synthesized hollow spherical Li3PO4 as template and FeCl2·4H2O/MnCl2·4H2O as Fe2+/Mn2+ source. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) show that the porous hierarchical spheres exhibit hollow structure and have a size distribution of 0.4–1 um consisting of aggregated ∼50 nm nanoparticles. A mechanism of the reaction from Li3PO4 to LiMn0.5Fe0.5PO4 was proposed on the basis of the phase and morphology transformation of the intermediates. With the short Li+ diffusion path and porous structure, the carbon coated LiMn0.5Fe0.5PO4 spheres show high specific capacity and superior rate capability with the discharge capacities of 159.3 mA h g−1 at 0.1C and 80.6 mA h g−1 at 20C. The porous hierarchical spheres also exhibit an excellent cycling stability with about 90.7% of the initial value at 1C after 100 cycles.
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