Preparation of nanorod-assembled CNT-embedded LiMnPO4 hollow microspheres for enhanced electrochemical performance of lithium-ion batteries
Preparation of nanorod-assembled CNT-embedded LiMnPO4 hollow microspheres for enhanced electrochemical performance of lithium-ion batteries
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制备纳米棒组装和碳纳米管嵌入的LiMnPO4空心微球以增强锂离子电池的电化学性能(DOI:10.1039/D1CE01342D)
DOI：
10.1039/d1ce01342d
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发表时间：
2022-02-08
期刊：
影响因子：
3.1
通讯作者：
Xie，Chengning
中科院分区：
文献类型：
--
作者：
Gao，Zhi;Zhang，Tao;Xie，Chengning
LiMnPO4是一种很有前途的锂离子电池正极材料，但它存在电导率差和Li+扩散率低的缺点。在这里，我们试图通过制备LiMnPO4/CNTs空心微球来同时改善电子转移和Li+迁移。以沉淀的Li3PO4/CNTs空心微球为牺牲模板，通过溶剂热反应合成了这些LiMnPO4/CNTs空心微球。在这些采用径向排列（010）暴露的纳米棒组装的LiMnPO4/CNTs空心微球中，嵌入的CNTs形成连接电子导电网络，排列的孔形成直Li+扩散通道。由于这些协同作用，LiMnPO4/CNTs空心微球具有优异的电化学性能。当放电速率从0.05℃增加到5℃时，LiMnPO4/CNTs空心微球的放电容量仅从166 ~ 116 mAh g−1下降，即使在1℃循环时，LiMnPO4/CNTs空心微球的放电容量也达到134 mAh g−1，循环100次后容量保持率约为96%。其优异的电化学性能可归因于碳纳米管嵌入的孔排列结构。
LiMnPO4 is a promising cathode material for lithium-ion batteries, but it has drawbacks of poor electronic conductivity and low Li+ diffusivity. Here, we have attempted to simultaneously improve electron transfer and Li+ migration by preparing LiMnPO4/CNTs hollow microspheres. These LiMnPO4/CNTs hollow microspheres are synthesized using precipitated Li3PO4/CNTs hollow microspheres as a sacrificial template and a subsequent solvothermal reaction. In these LiMnPO4/CNTs hollow microspheres assembled using radial-aligned (010)-exposed nanorods, the embedded CNTs form connecting electronic conductive network and the aligned pores form straight Li+ diffusion channels. Due to these synergistic effects, the LiMnPO4/CNTs hollow microspheres present superior electrochemical performance. The capacities of the LiMnPO4/CNTs hollow microspheres only decrease from 166 to 116 mA h g−1 as the rate increases from 0.05 to 5 C. Even when cycled at a rate of 1 C, the LiMnPO4/CNTs hollow microspheres achieve a discharge capacity of 134 mAh g−1 with about 96% capacity retention after 100 cycles. The excellent electrochemical performance can be ascribed to their CNT-embedded pore-aligned structure.