Three-dimensional graphene networks as efficient Sb anode skeleton for high-performance Si-based sodium ion microbatteries

作者：Chuang Yue, Yuan Li, Xiangxiang Fang, Gang Wang, Fang Hu, Yong Yang · 发表于：Journal of Power Sources · 年份：2024 · DOI：10.1016/j.jpowsour.2024.234497 · 被引用次数：10 · 研究领域：Advancements in Battery Materials、Advanced Battery Materials and Technologies、Supercapacitor Materials and Fabrication

Three-dimensional (3D) Si-based sodium ion microbatteries (SIMBs) are one of the most promising micro/nano power sources to meet the urgent demands of the micro/nano electromechanical system (M/NEMS) and the tiny smart semiconductor devices. Herein, the Sb electrode is firmly anchored on the 3D hierarchical Si/graphene supporting structure and embraces enhanced electrochemical performance when employed as anode for Si-based SIMBs. Both the enlarged surface area and the reduced electrons&ions transporting distance are beneficial to promote more Na ions reversibly and fast stored in the Sb active material. Moreover, the volume expansion of the Sb electrode during cycling can be well alleviated due to the enough space existed in the 3D micro/nanostructures, thus bring improved cycle life, which are verified from the post morphology characterizations. Systematical Na ion storage behaviors of the 3D Si/graphene/Sb (3D Si/Gr/Sb) microrod (MR) arrays electrode are investigated from the different scan rates of cyclic voltammetry (CV) results, ex-situ XRD/Raman tests, and first-principles theoretical calculations, which prove that the favorable kinetics in the 3D multilayer electrode configurations. Superb cycle stability of the as-constructed full battery of 3D Si/Gr/Sb||NaNiFeMnO 2 implies that the potential application of the 3D hierarchical electrode.