A novel nanosphere-in-nanotube iron phosphide Li-ion battery anode displaying a long cycle life, recoverable rate-performance, and temperature tolerance,Nanoscale

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A novel nanosphere-in-nanotube iron phosphide Li-ion battery anode displaying a long cycle life, recoverable rate-performance, and temperature tolerance
Nanoscale ( IF 5.8 ) Pub Date : 2021-08-18 , DOI: 10.1039/d1nr05294b
Jinyun Liu ₁ , Ting Zhou ₁ , Yan Wang ₁ , Tianli Han ₁ , Chaoquan Hu _{2,

3} , Huigang Zhang _{2,

3}

Affiliation

Currently, non-ideal anodes restricts the development of long-term stable Li-ion batteries. Several currently available high-capacity anode candidates are suffering from a large volumetric change during charge and discharge and non-stable solid interphase formation. Here, we develop a novel nanosphere-confined one-dimensional yolk–shell anode taking iron phosphide (FeP) as a demonstrating case study. Multiple FeP nanospheres are encapsulated inside an FeP nanotube through a magnetic field-assisted and templated approach, forming a nanosphere-in-nanotube yolk–shell (NNYS) structure. After long-term 1000 cycles at 2 A g⁻¹, the NNYS FeP anode shows a good capacity of 560 mA h g⁻¹, and a coulombic efficiency of 99.8%. A recoverable rate-performance is also obtained after three rounds of tests. Furthermore, the capacities and coulombic efficiency remain stable at temperatures of −10 °C and 45 °C, respectively, indicating good potential for use under different conditions.

中文翻译：

具有长循环寿命、可恢复倍率性能和温度耐受性的新型纳米球管中磷化铁锂离子电池负极

目前，非理想的负极限制了长期稳定锂离子电池的发展。几种当前可用的高容量阳极候选者在充电和放电过程中遭受大的体积变化和不稳定的固体界面形成。在这里，我们开发了一种新型纳米球限制的一维蛋黄壳阳极，以磷化铁 (FeP) 作为示范案例研究。通过磁场辅助和模板化方法将多个 FeP 纳米球封装在 FeP 纳米管内，形成纳米球在纳米管中的蛋黄壳 (NNYS) 结构。在 2 A g ^{-1 下}长期循环 1000 次后，NNYS FeP 阳极显示出 560 mA hg ^-1的良好容量，库仑效率为 99.8%。经过三轮测试也获得了可恢复的速率性能。此外，容量和库仑效率分别在-10°C和45°C的温度下保持稳定，表明在不同条件下具有良好的使用潜力。

更新日期：2021-09-13

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