Porous micro-spherical LiFePO4/CNT nanocomposite for high-performance Li-ion battery cathode material
Porous micro-spherical LiFePO4/CNT nanocomposite for high-performance Li-ion battery cathode material
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DOI：
10.1039/c5ra05988g
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发表时间：
2014-10
期刊：
影响因子：
3.9
通讯作者：
Wei Wei-Wei;Linli Guo;X. Qiu;Peng Qu;Maotian Xu;Lin Guo
中科院分区：
文献类型：
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作者：
Wei Wei-Wei;Linli Guo;X. Qiu;Peng Qu;Maotian Xu;Lin Guo
虽然已经开发了许多可以有效改善锂离子电池LiFePO 4（LFP）正极电化学性能的方法，但很少有方法能够满足大规模生产、低成本和优异性能的迫切工业需求。在这项工作中，使用水热合成工艺，然后高温锂化，我们能够设计一个多孔的微球形LFP/碳纳米管（CNTs）纳米复合材料。LFP/CNT纳米复合材料内部碳纳米管和外部碳层的有效结合以及多孔结构导致其优异的电化学性能。作为锂离子电池的正极材料，该纳米复合材料在20 C下的放电容量可达122 mA h g−1。500次循环后，1C下的容量保持率可达到94.3%。LFP/CNT纳米复合材料具有合成方法简单、易于放大、原料成本低、电化学性能好等优点，有望成为锂离子电池正极材料。
Although many routes have been developed that can efficiently improve the electrochemical performance of LiFePO4 (LFP) cathodes for Li-ion batteries, few of them meet the urgent industrial requirements of large-scale production, low cost and excellent performance. In this work, using a hydrothermal synthetic process followed by high-temperature lithiation, we are able to design a porous micro-spherical LFP/carbon nanotubes (CNTs) nanocomposite. The efficient combination of the inner CNTs and the outer carbon layer along with the porous structure of the LFP/CNT nanocomposite lead to its excellent electrochemical performance. As a cathode material for Li-ion batteries, the discharge capacity of the nanocomposite can reach 122 mA h g−1 at 20 C. After 500 cycles, a capacity retention of 94.3% can be reached at 1 C. Because of the facile and easily scaled up synthetic method, low-cost raw materials and excellent electrochemical performance, the as-designed LFP/CNT nanocomposite can be expected to be a potential cathode candidate for Li-ion batteries.