Synthesis of hierarchical and bridging carbon-coated LiMn 0.9 Fe 0.1 PO 4 nanostructure as cathode material with improved performance for lithium ion battery
Synthesis of hierarchical and bridging carbon-coated LiMn 0.9 Fe 0.1 PO 4 nanostructure as cathode material with improved performance for lithium ion battery
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DOI：
10.1016/j.jpowsour.2017.05.067
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发表时间：
2017-08
影响因子：
9.2
通讯作者：
F. Ma;Xiaoyu Zhang;P. He;Xueping Zhang;Peng Wang;Haoshen Zhou
中科院分区：
文献类型：
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作者：
F. Ma;Xiaoyu Zhang;P. He;Xueping Zhang;Peng Wang;Haoshen Zhou
通过一种新颖且简便的胺辅助涂层策略合成了热解碳和还原氧化石墨烯共掺杂的LiMn0.9Fe0.1PO4(LMFP/C/rGO)。精心设计的共掺杂LiMn0.9Fe0.1PO4纳米板（LMFP/C/rGO，长度150 nm，厚度20 nm）被证明是具有良好结晶度的橄榄石相，并从结构和电化学角度与单独热解碳涂覆的LiMn0.9Fe0.1PO4（LMFP/C）进行了比较。 LMFP/C/rGO 表现出优异的电化学性能，0.1C 时的比容量为 158.0 mAh g−1，20C 时的比容量为 124.6 mAh g−1，据我们所知，这是最高的倍率能力。此外，在0.2C倍率下循环140次后，仍保留约95%的初始容量。进一步的分析表明，出色的电化学性能可归因于均匀涂覆的热解碳和紧密连接的具有非凡电子导电性的rGO的协同作用。我们的研究表明，这种有效的合成策略对于提高锂离子电池性能至关重要，并且可以广泛用于先进的能源存储。
A pyrolyzed carbon and reduced graphene oxide co-doped LiMn0.9Fe0.1PO4(LMFP/C/rGO) is synthesized by a novel and facile amine-assisted coating strategy. The well designed co-doped LiMn0.9Fe0.1PO4nanoplate (LMFP/C/rGO, 150 nm in length and 20 nm in thickness) is proved to be olivine phase with good crystallinity which is further compared with the sole pyrolyzed carbon coated LiMn0.9Fe0.1PO4(LMFP/C) from structural and electrochemical points of views. The LMFP/C/rGO exhibits superior electrochemical performances with the specific capacity of 158.0 mAh g−1at 0.1C and 124.6 mAh g−1at 20C, which is, to the best of our knowledge, the highest rate capability. Moreover, after 140 cycles at 0.2C rate, around 95% of the initial capacity is still retained. Further analyses disclosed the outstanding electrochemical performances can be ascribed to the collaboration of the uniformly coated pyrolyzed carbon and closely connected rGO with an extraordinary electronic conductivity. Our research shows this effective synthesis strategy is imperative for the improvement of Li-ion battery performance and can be widely used for advanced energy storage.