Lithium metal anode has become a favorable candidate for next-generation rechargeable ***, the unstable interface between lithium metal and electrolyte leads to the growth of dendrites,resulting in the low Coulombic e...
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Lithium metal anode has become a favorable candidate for next-generation rechargeable ***, the unstable interface between lithium metal and electrolyte leads to the growth of dendrites,resulting in the low Coulombic efficiency and even the safety concerns. Herein, a rigid-flexible dual-layer vermiculite nanosheet(VN) based organic-inorganic hybrid film on lithium metal anode is proposed to suppress dendrite growth and relieve volume fluctuations. The inner mechanically robust VN layer(3 μm thick) enhances the mechanical properties of the protective layer, while the outer polymer(4 μm thick) can enhance the flexibility of the hybrid layer. The Li | Li symmetric cell with protected lithium shows an extended life of over 670 h. The full cell with Li anode protected by dual-layer interface exhibits a better capacity retention of 80% after 174 cycles in comparison to bare Li anode with 94 *** study provides a novel approach and a significant step towards prolonging lifespan of lithium metal batteries.
Microcracks and surface heterogeneity in solid-electrolyte interphase (SEI) induced by repeated plating/stripping of lithium (Li) metal exacerbate SEI fracture propagation and dendrite growth, which lead to unsatisfac...
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Microcracks and surface heterogeneity in solid-electrolyte interphase (SEI) induced by repeated plating/stripping of lithium (Li) metal exacerbate SEI fracture propagation and dendrite growth, which lead to unsatisfactory Coulombic efficiency and limited cycle life of Li metal anode. In this study, the hybrid artificial interfaces with controlled organic-inorganic ratios are designed and deep insight into their impacts on the electro-chemo-mechanical properties is obtained. The organic-inorganic ratios in the hybrid interfaces influence the mechanical properties, lithiophilicity, and diffusion kinetics of the interfaces, which in turn affect the nucleation, early growth, and repeated deposition/dissolution behavior of Li. It is found that increasing the inorganic ratio in the hybrid interface can realize significantly enhanced electrochemical performances. This work answers a key question for hybrid interfaces: should organic-rich or inorganic-rich be preferred in the hybrid interface? It is believed that this work will guide the future design of hybrid interfaces for Li metal anode and open up opportunities for the realization of next-generation Li metal batteries. Through adjusting the organic-inorganic ratio inside the hybrid interfaces, the mechanical toughness, lithiophilicity, and diffusion kinetics of the hybrid interfaces can be precisely tuned, which thereby influences the nucleation, early growth behavior, and final bulk deposition morphology of Li. image
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