Abstract
Silicon has ultrahigh capacity, dendrite-free alloy lithiation mechanism and low cost and has been regarded as a promising anode candidate for solid-state battery. Owing to the low infiltration of solid-state electrolyte (SSE), not the unstable solid–electrolyte interphase (SEI), but the huge stress during lithiation- and delithiation-induced particle fracture and conductivity lost tend to be the main issues. In this study, starting with micron-Si, a novel monothetic carbon conductive framework and a MgO coating layer are designed, which serve as electron pathway across the whole electrode and stress releasing layer, respectively. In addition, the in situ reaction between Si and SSE helps to form a LiF-rich and mechanically stable SEI layer. As a result, the mechanical stability and charge transfer kinetics of the uniquely designed Si anode are significantly improved. Consequently, high initial Coulombic efficiency, high capacity and durable cycling stability can be achieved by applying the Si@MgO@C anode in SSB. For example, high specific capacity of 3224.6 mAh·g−1 and long cycling durability of 200 cycles are achieved. This work provides a new concept for designing alloy-type anode that combines surface coating on particle and electrode structure design.
Graphical abstract
摘要
改性微米硅负极上的单一导电网络和机械应力释放层实现高能量固态电池
韩响, 许敏, 顾岚汇, 兰超飞, 陈敏峰, 陆俊杰, 盛必福, 王鹏, 陈松岩, 陈继章
南京林业大学材料科学与工程学院, 林业资源高效加工利用协同创新中心 南京210037
摘要 硅具有超高的比容量、无枝晶和低成本的特点, 但与锂金属负极相比, 在固态电池的研究和设计中被低估。由于固态电解质(SSE)的低渗透性, 在锂化和脱锂过程中的巨大应力导致颗粒粉化和导电性损失往往是主要问题, 而不是不稳定的固体电解质界面(SEI)。在这篇论文中, 在微米级硅表面设计了一种单层碳导电框架, 它不仅提升了整个电极的高导电性, 而且改善了颗粒表面的电荷转移动力学。此外, 通过COMSOL建模和TEM分析证实, 陶瓷MgO涂层释放了体积膨胀产生的应力。结果, 独特设计的Si负极的机械稳定性和电荷转移动力学显著提高。因此, Si-MgO-C负极在在固态电池中, 表现出高的初始库仑效率、高容量和持久的循环稳定性。例如, 具有3224.6 mAh·g−1的高比容量和200次循环的长循环耐久性。这一工作为颗粒表面包覆和电极结构设计相结合的合金型负极设计提供了新的思路。
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This work was financially supported by the National Natural Science Foundation of China (No. 22209075) and the Natural Science Foundation of Jiangsu Province (BK20200800).
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Han, X., Xu, M., Gu, LH. et al. Monothetic and conductive network and mechanical stress releasing layer on micron-silicon anode enabling high-energy solid-state battery. Rare Met. 43, 1017–1029 (2024). https://doi.org/10.1007/s12598-023-02498-4
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DOI: https://doi.org/10.1007/s12598-023-02498-4