Affiliation:
1. Department of Chemistry Laboratory of Advanced Materials Shanghai Key Lab of Molecular Catalysis and Innovative Materials and State Key Laboratory of Molecular Engineering of Polymers Fudan University Shanghai 200433 P. R. China
Abstract
AbstractConcentration polarization‐induced lithium dendrites seriously impede the practical application of high‐energy‐density lithium metal batteries. Porous materials that aim to inhibit lithium dendrites are extensively explored. However, their effects are still limited by the intrinsic features of the pores, especially channel geometry and surface properties. Herein, a separator modification strategy of blocking “dendritic deposition” via “dendritic channels” is proposed. A porous shield‐like film is formed on the polypropylene separator through the close packing of ultra‐small (≈100 nm) silica nanospheres with unique dendritic mesopores (DMS). Besides the hierarchical pores homogenizing the ion flux, the DMS film also provides abundant Si(OH)x groups, preferentially adsorbing the TFSI− in the electrolyte and accelerating the transport of Li+. Most notably, the dendritic mesochannels with high complexity can diversify the growth directions of lithium and contribute to a more substantial homogenizing process of Li+. Consequently, a dendrite‐free deposition with 1000 stable cycles in Li|Li symmetric cells even at 10 mA cm−2 is achieved. This study provides a scalable approach for the fabrication of mesoporous separators and offers a fresh perspective on the future design of advanced separators utilized for dendrite suppression.
Funder
Program of Shanghai Academic Research Leader
Fundamental Research Funds for the Central Universities
Subject
Electrochemistry,Condensed Matter Physics,Biomaterials,Electronic, Optical and Magnetic Materials
Cited by
14 articles.
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