Abstract Hierarchical mesoporous Li2FeSiO4/C sheaf-rods (HMLFS-SRs) were fabricated using a hard template method with SBA-15 as a silicon source. For comparision, Li2FeSiO4/C nanocomposites (LFS) were prepared using nano-SiO2 under the same conditions. XRD results prove that both the HMLFS-SRs and LFS contain crystalline Li2FeSiO4 and trace amounts of Fe3O4 impurities. The SEM and TEM images indicate that the HMLFS-SRs are hierarchical sheaf rods composed of nanoparticles. EDS data prove that elemental Fe, Si, O and C are uniformly distributed throughout the whole Li2FeSiO4/C sheaf rod. Nitrogen adsorption/desorption analyses further indicate that the HMLFS-SRs are typical mesoporous materials with an external surface area of 47 m2 g−1, which is higher than that of the LFS (31 m2 g−1). These unique structures enable the HMLFS-SRs to exhibit much better electrochemical performance than the LFS. The HMLFS-SRs deliver a high discharge capacity of 206.6 mAh g−1 at 0.1 C. In addition, the HMLFS-SRs also have good cycling performance, satisfactory rate performance, a low charge transfer resistance and a large lithium-ion diffusion coefficient.

中文翻译：

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分层介孔 Li 2 FeSiO 4 /C 层棒作为高性能锂离子电池正极

摘要 使用硬模板方法以 SBA-15 作为硅源制备了分层介孔 Li2FeSiO4/C 层杆 (HMLFS-SR)。为了进行比较，在相同条件下使用纳米 SiO2 制备 Li2FeSiO4/C 纳米复合材料 (LFS)。XRD 结果证明 HMLFS-SR 和 LFS 都含有结晶 Li2FeSiO4 和痕量的 Fe3O4 杂质。SEM 和 TEM 图像表明 HMLFS-SR 是由纳米粒子组成的分层层杆。EDS 数据证明元素 Fe、Si、O 和 C 均匀分布在整个 Li2FeSiO4/C 层杆中。氮吸附/解吸分析进一步表明，HMLFS-SRs 是典型的介孔材料，外表面积为 47 m2 g-1，高于 LFS (31 m2 g-1)。这些独特的结构使 HMLFS-SR 表现出比 LFS 更好的电化学性能。HMLFS-SRs 在 0.1 C 下提供 206.6 mAh g-1 的高放电容量。此外，HMLFS-SRs 还具有良好的循环性能、令人满意的倍率性能、低电荷转移电阻和大锂离子扩散系数。