期刊
ADVANCED FUNCTIONAL MATERIALS
卷 30, 期 35, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202002980
关键词
high volumetric capacity; Li-ion batteries; self-assembled hierarchical architecture; Si@TiO(2)building blocks; stress management
类别
资金
- National Science Foundation of China [51876052, 51976118]
- Fundamental Research Funds for the Provincial Universities of Zhejiang [GK199900299012-021]
Silicon nanoparticles (Si NPs) have been considered as promising anode materials for next-generation lithium-ion batteries, but the practical issues such as mechanical structure instability and low volumetric energy density limit their development. At present, the functional energy-storing architectures based on Si NPs building blocks have been proposed to solve the adverse effects of nanostructures, but designing ideal functional architectures with excellent electrochemical performance is still a significant challenge. This study shows that the effective stress evolution management is applied for self-assembled functional architectures via cross-scale simulation and the simulated stress evolution can be a guide to design a scalable self-assembled hierarchical Si@TiO2@C (SA-SiTC) based on core-shell Si@TiO(2)nanoscale building blocks. It is found that the carbon filler and TiO(2)layer can effectively reduce the risk of cracking during (de)lithiation, ensuring the stability of the mechanical structure of SA-SiTC. The SA-SiTC electrode shows long cycling stability (842.6 mAh g(-1)after 1000 cycles at 2 A g(-1)), high volumetric capacity (174 mAh cm(-3)), high initial Coulombic efficiency (80.9%), and stable solid-electrolyte interphase (SEI) layer. This work provides insight into the development of the structural stable Si-based anodes with long cycle life and high volumetric energy density for practical energy applications.
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