Sun Kai, Xiao Xu, Shang Wenxu, Fu Kang, Li Xueyan, Zhang Zhuojun, Gong Lili, Tan Peng
Department of Thermal Science and Energy Engineering, University of Science and Technology of China (USTC), Hefei, Anhui, 230026, China.
Deep Space Exploration Laboratory, Hefei, 230088, China.
Small. 2024 Nov;20(48):e2405674. doi: 10.1002/smll.202405674. Epub 2024 Sep 3.
Si provides an effective approach to achieving high-energy batteries owing to its high energy density and abundance. However, the poor stability of Si requires buffering with graphite particles when used as anodes. Currently, commercial lithium-ion batteries with Si/graphite composite anodes can provide a high energy density and are expected to replace traditional graphite-based batteries. The different lithium storage properties of Si and graphite lead to different degrees of lithiation and chemical environments for this composite anode, which significantly affects the performance of batteries. Herein, the interplay between Si and graphite in mechanically mixed Si/graphite composite anodes is emphasized, which alters the lithiation sequence of the active materials and thus the cycling performance of the battery. Furthermore, performance optimization can be achieved by changing the intrinsic properties of the active materials and external operating conditions, which are summarized and explained in detail. The investigation of the interplay based on Si/graphite composite anodes lays the foundation for developing long-life and high-energy batteries. The abovementioned experimental methods provide logical guidance for future research on composite electrodes with multiple active materials.
由于硅具有高能量密度和丰富性，它为实现高能量电池提供了一种有效途径。然而，硅的稳定性较差，用作阳极时需要用石墨颗粒进行缓冲。目前，具有硅/石墨复合阳极的商用锂离子电池可以提供高能量密度，并有望取代传统的石墨基电池。硅和石墨不同的储锂特性导致该复合阳极的锂化程度和化学环境不同，这显著影响电池的性能。在此，强调了机械混合的硅/石墨复合阳极中硅和石墨之间的相互作用，这种相互作用改变了活性材料的锂化顺序，进而影响电池的循环性能。此外，通过改变活性材料的固有特性和外部操作条件可以实现性能优化，本文对此进行了详细总结和解释。基于硅/石墨复合阳极的相互作用研究为开发长寿命、高能量电池奠定了基础。上述实验方法为未来研究具有多种活性材料的复合电极提供了逻辑指导。
