Stress‐Relieved Nanowires by Silicon Substitution for High‐Capacity and Stable Lithium Storage,Advanced Energy Materials

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Stress‐Relieved Nanowires by Silicon Substitution for High‐Capacity and Stable Lithium Storage
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2018-02-02 , DOI: 10.1002/aenm.201702805
Ting He _{1,

2,

3} , Jianrui Feng ₄ , Yan Zhang ₁ , Lianhai Zu ₁ , Guichang Wang ₄ , Yan Yu ₅ , Jinhu Yang _{1,

3}

Affiliation

Silicon is promising as a high energy anode for next‐generation lithium‐ion batteries. However, severe capacity fading upon cycling associated with huge volume change is still an obstacle for silicon toward practical applications. Herein, the authors report that Si‐substituted Zn₂(GeO₄)_0.8(SiO₄)_0.2 nanowires can effectively suppress volume expansion effect, exhibiting high specific capacity (1274 mA h g⁻¹ at 0.2 A g⁻¹ after 700 cycles) and ultralong cycling stability (2000 cycles at 5 A g⁻¹ with a capacity decay rate of 0.008% per cycle), which represents outstanding comprehensive performance. The superior performance is ascribed to the substitution of Si atom that imparts to the nanowires not only high reactivity and reversibility, but also the unique stress‐relieved property upon lithiation which is further confirmed by detailed density‐functional theory computation. This work provides a new guideline for designing high‐performance Si‐based materials toward practical energy storage applications.

中文翻译：

硅替代应力释放纳米线，可实现大容量和稳定的锂存储

硅有望成为下一代锂离子电池的高能阳极。然而，随着容量的巨大变化，循环时严重的容量衰减仍然是硅在实际应用中的障碍。在此，作者报告说，Si取代的Zn ₂（GeO ₄）_0.8（SiO ₄）_0.2纳米线可以有效地抑制体积膨胀效应，表现出高的比容量（700个循环后在0.2 A g ^-1下为1274 mA hg ^-1）和超长循环稳定性（5 A g ^-1时2000次循环容量衰减率为每个周期0.008％），代表了出色的综合性能。优异的性能归因于Si原子的取代，它不仅赋予纳米线高反应性和可逆性，而且赋予了锂化时独特的应力消除特性，这一点通过详细的密度泛函理论计算得到了进一步证实。这项工作为针对高性能储能应用的高性能硅基材料设计提供了新指南。

更新日期：2018-02-02

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