控制角损耗硅废料的氧化,实现稳定的电池阳极

Processes Pub Date : 2024-06-07 DOI:10.3390/pr12061173
Yan Jiang, Sitong He, Siqi Ma, F. Xi, Ilya M. Gavrilin, Zhongqiu Tong, Jijun Lu, Neng Wan, Wenhui Ma, Yunpeng Zhu, Pingkeng Wu, Shaoyuan Li
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摘要

将大量切口损耗的硅废料回收为硅阳极是有效利用资源和保护环境的一种有吸引力的方法。数十纳米厚度的硅废料颗粒实现了高倍率锂离子存储的高度可行性,但持续氧化会导致电化学活性逐渐丧失。了解这种氧化与锂离子存储特性之间的关系是将硅废料有效回收为硅阳极的关键。然而,相应的研究却很少见。本文合成了一系列不同氧化态的硅废料样品,并研究了它们的锂离子存储特性。通过分析它们的锂离子存储特性和动力学,我们发现氧化对锂离子存储性能有绝对的不利影响,这与之前报道的纳米硅材料的结果不同。在 0.5 A/g 条件下,2.5 wt.% 硅可提供高达 3519 mAh/g 的初始放电容量。在 1 A/g 条件下循环 500 次后,2.5 wt.% Si 的容量保持率接近 70%。然而,35.8 wt.% Si 的初始放电容量仅为 170 mAh/g。此外,氧化还导致锂离子存储动力学从锂离子扩散控制行为转变为电荷转移控制行为。对于氧含量超过 35.8 wt.% 的切口损耗硅废料,由于电荷转移电阻高、锂离子扩散系数低,因此失去了锂离子存储能力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Controlling Oxidation of Kerf Loss Silicon Waste Enabling Stable Battery Anode
The recovery of massive kerf loss silicon waste into silicon anodes is an attractive approach to efficiently utilizing resources and protect the environment. Tens-of-nanometers-scale-thickness Si waste particles enable the high feasibility of high-rate Li-ion storage, but continuous oxidation leads to a gradual loss of electrochemical activity. Understanding the relationship between this oxidation and Li-ion storage properties is key to efficiently recovering silicon wastes into silicon anodes. However, corresponding research is rare. Herein, a series of silicon waste samples with different oxidation states were synthesized and their Li-ion storage characters were investigated. By analyzing their Li-ion storage properties and kinetics, we found that oxidation has absolutely detrimental effects on Li-ion storage performance, which is different to previously reported results of nano-silicon materials. The 2.5 wt.% Si provides a substantial initial discharge capacity of 3519 mAh/g at 0.5 A/g. The capacity retention of 2.5 wt.% Si is almost 70% after 500 cycles at 1 A/g. However, the 35.8 wt.% Si presents a modest initial discharge capacity of merely 170 mAh/g. Additionally, oxidation leads the Li-ion storage kinetics to transform from Li-ion diffusion-controlled to charge transfer-controlled behaviors. For kerf loss silicon waste with an oxygen content over 35.8 wt.%, Li-ion storage capability is lost due to a high charge transfer resistance and a low Li-ion diffusion coefficient.
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