A Mapping of the Physical and Electrochemical Properties of Composite Lithium‐Ion Batteries Anodes Made from Graphite, Sn, and Si,Batteries & Supercaps

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A Mapping of the Physical and Electrochemical Properties of Composite Lithium‐Ion Batteries Anodes Made from Graphite, Sn, and Si
Batteries & Supercaps ( IF 5.1 ) Pub Date : 2020-06-07 , DOI: 10.1002/batt.202000096
Sacha Smrekar _{1,

2} , M. Victoria Bracamonte _{1,

2} , Emiliano N. Primo _{1,

2} , Guillermina L. Luque _{3,

4} , Jorge Thomas ₅ , Daniel E. Barraco _{1,

2} , Ezequiel Leiva _{3,

4}

Affiliation

Nowadays, there is an evident need to improve the current Li‐ion battery systems, in order to make them more reliable, durable and safe. Regarding this objective, the application of composite materials –based mainly on the combination of Si, Sn and carbon– appears as a very promising alternative for future anode materials. However, despite the great amount of publications dealing with this topic, there is not a systematic study that allows interpreting and understanding how the combination of these materials affects the electrochemical performance of the anodes prepared with them. In light of this need, in this work we propose a straightforward ball‐milling procedure to prepare Sn/Si/graphite composites with different mass proportions of each material. For all compositions, a systematic study was performed in order to determine how each material affects the specific capacity, capacity fading and stability towards a change in loading current. We found that the material prepared with Sn₃₃Si₃₃C₃₃ appears to be the most promising one, delivering a reversible capacity of 906.9 mAh g⁻¹ even after 120 cycles at 0.5 A g⁻¹, thus encouraging the development of new composites based on these materials for industrial applications.

中文翻译：

石墨，锡和硅复合锂离子电池负极的物理和电化学特性映射

如今，显然需要改进当前的锂离子电池系统，以使其更加可靠，耐用和安全。关于此目标，复合材料的应用（主要基于Si，Sn和碳的组合）似乎是未来阳极材料的非常有前途的替代方法。然而，尽管有大量关于该主题的出版物，但是还没有系统的研究可以解释和理解这些材料的组合如何影响用它们制备的阳极的电化学性能。根据这一需求，在这项工作中，我们提出了一种简单的球磨工艺，以制备每种材料的质量比不同的Sn / Si /石墨复合材料。对于所有成分，为了确定每种材料如何影响比容量，容量衰减和负载电流变化的稳定性，进行了系统的研究。我们发现用锡制备的材料₃₃ Si ₃₃ C ₃₃似乎是最有前途的一种，即使在0.5 A g ^-1下循环120次后仍可提供906.9 mAh g ^-1的可逆容量，因此鼓励开发基于这些材料的新型复合材料用于工业应用。

更新日期：2020-06-07

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