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Insights into the Effect of Heat Treatment and Carbon Coating on the Electrochemical Behaviors of SiO Anodes for Li-Ion Batteries
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2022-03-21 , DOI: 10.1002/aenm.202200127 Shuai Xu 1 , Xiaodong Hou 1 , Dongniu Wang 2 , Lucia Zuin 2 , Jigang Zhou 2 , Yong Hou 1 , Michael Mann 1
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2022-03-21 , DOI: 10.1002/aenm.202200127 Shuai Xu 1 , Xiaodong Hou 1 , Dongniu Wang 2 , Lucia Zuin 2 , Jigang Zhou 2 , Yong Hou 1 , Michael Mann 1
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The use of SiO as an anode material has attracted significant interest due to its high capacity and long cycling life. Many promising approaches, including structural design and carbon coating at high temperatures, effectively improve its intrinsic low electrical conductivity and poor Coulombic efficiency. However, the “heat treatment process-composition and microstructure-electrochemical properties” relationship of the SiO anode is not fundamentally understood. Here the structure and composition evolution in amorphous SiO and graphene-coated SiO is investigated using different heat-treatment conditions. X-ray absorption near-edge structure techniques are also employed to analyze the surface and bulk composition change during the initial lithiation process, supplemented by physical or chemical characterization and electrochemical testing. The results reveal the structural transition of SiO during heat treatment, from amorphous to disproportionated hierarchical structure, where the as-formed dielectric exterior SiO2 shell and interior SiO2 matrix severely polarizes electrodes, hindering the lithiation process. Carbon coating on SiO effectively restricts the growth of the SiO2 shell and facilitates charge transfer, leading to improved electrochemical performance. A schematic model is proposed to reveal the relationship between the treatments, the resultant structural evolutions, and corresponding electrochemical behaviors.
中文翻译：
深入了解热处理和碳涂层对锂离子电池 SiO 阳极电化学行为的影响
使用 SiO 作为负极材料由于其高容量和长循环寿命而引起了极大的兴趣。许多有前途的方法，包括高温下的结构设计和碳涂层，有效地改善了其固有的低电导率和较差的库仑效率。然而，SiO阳极的“热处理工艺-成分和微观结构-电化学性能”关系尚不完全清楚。在这里，使用不同的热处理条件研究了非晶 SiO 和石墨烯涂层 SiO 的结构和组成演变。X 射线吸收近边缘结构技术也用于分析初始锂化过程中的表面和整体成分变化，并辅以物理或化学表征和电化学测试。2壳和内部SiO 2基质严重极化电极，阻碍锂化过程。SiO上的碳涂层有效地限制了SiO 2壳的生长并促进电荷转移，从而提高了电化学性能。提出了一个示意图模型来揭示处理、由此产生的结构演变和相应的电化学行为之间的关系。
更新日期：2022-03-21
中文翻译：
深入了解热处理和碳涂层对锂离子电池 SiO 阳极电化学行为的影响
使用 SiO 作为负极材料由于其高容量和长循环寿命而引起了极大的兴趣。许多有前途的方法，包括高温下的结构设计和碳涂层，有效地改善了其固有的低电导率和较差的库仑效率。然而，SiO阳极的“热处理工艺-成分和微观结构-电化学性能”关系尚不完全清楚。在这里，使用不同的热处理条件研究了非晶 SiO 和石墨烯涂层 SiO 的结构和组成演变。X 射线吸收近边缘结构技术也用于分析初始锂化过程中的表面和整体成分变化，并辅以物理或化学表征和电化学测试。2壳和内部SiO 2基质严重极化电极，阻碍锂化过程。SiO上的碳涂层有效地限制了SiO 2壳的生长并促进电荷转移，从而提高了电化学性能。提出了一个示意图模型来揭示处理、由此产生的结构演变和相应的电化学行为之间的关系。
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