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FeF3·0.33H2O@carbon nanosheets with honeycomb architectures for high-capacity lithium-ion cathode storage by enhanced pseudocapacitance
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2021-06-02 , DOI: 10.1039/d1ta03141d
Liguo Zhang 1, 2, 3, 4 , Litao Yu 1, 2, 3, 4 , Oi Lun Li 1, 2, 3, 4 , Si-Young Choi 4, 5, 6, 7 , Ghuzanfar Saeed 2, 3, 4, 8 , Kwang Ho Kim 1, 2, 3, 4, 8
Affiliation  

There is an increasing demand for current and future applications to obtain charge storage devices with both energy and power superiority. Recently, several high-rate pseudocapacitive anode materials for Li-ion batteries have been reported; however, the research on the pseudocapacitive properties of cathode materials is much less common. Herein, an FeF3·0.33H2O@CNS (carbon nanosheet) composite, where ultrafine FeF3·0.33H2O particles are intimately embedded into nitrogen-doped carbon nanosheets, was successfully designed and fabricated. The pseudocapacitive effect of the composite cathode was demonstrated and explored by its Li+ storage kinetic analysis. The results demonstrated that the FeF3·0.33H2O@CNS cathode with a higher capacitance distribution rate than bare FeF3·0.33H2O provides higher rate performance with discharge capacities of 235, 175, and 143 mA h g−1 at 0.1C, 1C, and 5C, respectively. It also displayed an excellent cycle performance (capacity retention of 97.2% at 1C after 200 cycles). FeF3·0.33H2O@CNS//LCNS full cells combined with pre-lithiated carbon nanosheets (LCNSs) also exhibit excellent electrochemical performance. Therefore, the electrochemical performance of cathode materials can be improved by adjusting their pseudocapacitive contribution, which represents a promising and effective strategy for obtaining electrode materials with high energy and high-power densities.

中文翻译:

具有蜂窝结构的FeF3·0.33H2O@碳纳米片通过增强的赝电容用于高容量锂离子阴极存储

当前和未来的应用越来越需要获得具有能量和功率优势的电荷存储设备。最近,报道了几种用于锂离子电池的高倍率赝电容负极材料;然而,对正极材料赝电容特性的研究却很少见。在此,成功设计并制造了一种FeF 3 ·0.33H 2 O@CNS(碳纳米片)复合材料,其中超细FeF 3 ·0.33H 2 O 颗粒紧密嵌入氮掺杂的碳纳米片中。复合正极的赝电容效应通过其 Li +储存动力学分析得到证实和探索。结果表明,FeF 3·0.33H 2 O@CNS 阴极具有比裸 FeF 3更高的电容分布率·0.33H 2 O 提供更高的倍率性能,在 0.1C、1C 和 5C 下的放电容量为235、175和 143 mA hg -1,分别。它还显示出优异的循环性能(200 次循环后 1C 下的容量保持率为 97.2%)。FeF 3 ·0.33H 2O@CNS//LCNS 全电池与预锂化碳纳米片 (LCNS) 相结合也表现出优异的电化学性能。因此,可以通过调整其赝电容贡献来改善正极材料的电化学性能,这是获得高能量和高功率密度电极材料的一种有前景且有效的策略。
更新日期:2021-06-25
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