Porous Fe2O3 nanorod-decorated hollow carbon nanofibers for high-rate lithium storage,Advanced Composites and Hybrid Materials

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Porous Fe2O3 nanorod-decorated hollow carbon nanofibers for high-rate lithium storage
Advanced Composites and Hybrid Materials ( IF 23.2 ) Pub Date : 2021-12-28 , DOI: 10.1007/s42114-021-00397-9
Zhiwen Long ₁ , Luhan Yuan ₁ , Chu Shi ₁ , Caiqin Wu ₁ , Hui Qiao ₁ , Keliang Wang ₂

Affiliation

Transition metal oxides (TMOs) are considered as promising anode materials for lithium-ion batteries in comparison with conventional graphite anode. However, TMO anodes suffer severe volume expansion during charge/discharge process. In this respect, a porous Fe₂O₃ nanorod-decorated hollow carbon nanofiber (HNF) anode is designed via a combined electrospinning and hydrothermal method followed by proper annealing. FeOOH/PAN was prepared as precursors and sacrificial templates, and porous hollow Fe₂O₃@carbon nanofiber (HNF-450) composite is formed at 450 °C in air. As anode materials for lithium-ion batteries, HNF-450 exhibits outstanding rate performance and cycling stability with a reversible discharge capacity of 1398 mAh g⁻¹ after 100 cycles at a current density of 100 mA g⁻¹. Specific capacities 1682, 1515, 1293, 987, and 687 mAh g⁻¹ of HNF-450 are achieved at multiple current densities of 200, 300, 500, 1000, and 2000 mA g⁻¹, respectively. When coupled with commercial LiCoO₂ cathode, the full cell delivered an outstanding initial charge/discharge capacity of 614/437 mAh g⁻¹ and stability at different current densities. The improved electrochemical performance is mainly attributed to the free space provided by the unique porous hollow structure, which effectively alleviates the volume expansion and facilitates the exposure of more active sites during the lithiation/delithiation process.

Graphical abstract

Porous Fe₂O₃ nanorod-decorated hollow carbon nanofibers exhibit outstanding rate performance and cycling stability with a high reversible discharge capacity.

中文翻译：

用于高倍率储锂的多孔 Fe2O3 纳米棒装饰中空碳纳米纤维

与传统的石墨负极相比，过渡金属氧化物（TMO）被认为是锂离子电池的有前途的负极材料。然而，TMO 负极在充电/放电过程中会发生严重的体积膨胀。在这方面，多孔 Fe ₂ O ₃纳米棒装饰的中空碳纳米纤维 (HNF) 阳极是通过电纺和水热相结合的方法设计的，然后进行适当的退火。制备 FeOOH/PAN 作为前驱体和牺牲模板，在空气中 450°C 形成多孔空心 Fe ₂ O ₃ @碳纳米纤维（HNF-450）复合材料。作为锂离子电池负极材料，HNF-450表现出优异的倍率性能和循环稳定性，可逆放电容量为1398 mAh g^-1在 100 mA g ^-1的电流密度下循环 100 次后。HNF-450 的比容量为 1682、1515、1293、987 和 687 mAh g ^-1分别在 200、300、500、1000 和 2000 mA g ^{-1 的}多个电流密度下实现。当与商用 LiCoO ₂正极结合时，全电池提供了 614/437 mAh g ^-1的出色初始充电/放电容量和不同电流密度下的稳定性。电化学性能的提高主要归功于独特的多孔中空结构提供的自由空间，有效缓解了体积膨胀，并有利于锂化/脱锂过程中更多活性位点的暴露。