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Electrostatic self-assembled aminated dendritic silica/lithium polyacrylate artificial interphase for long-life Li
Hongling Yao1, Liya Rong1, Hao Tan1
1Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Overseas Expertise Introduction Center for Discipline Innovation (D18025), Key Laboratory for the Green Preparation and Application of Functional Materials, Hubei Key Laboratory of Polymer Materials, College of New Energy and Electrical Engineering, School of Materials Science and Engineering, Hubei University, Wuhan 430062, PR China.
A new composite solid electrolyte interphase (SEI) using aminated dendritic mesoporous silica (NH2-DMS) and lithium polyacrylate (PAALi) enables stable lithium metal batteries (LMBs) by preventing dendrite growth and improving ion conductivity.
Area of Science:
- Materials Science
- Electrochemistry
- Battery Technology
Background:
- Unstable solid electrolyte interphase (SEI) and lithium dendrite growth hinder lithium metal battery (LMB) commercialization.
- Existing organic-inorganic hybrid SEI face challenges in balancing mechanical strength and ion conductivity.
Purpose of the Study:
- To develop a robust and ion-conductive artificial composite SEI for LMBs.
- To address the trade-off between mechanical rigidity and electrochemical kinetics in SEI layers.
Main Methods:
- Fabrication of a composite SEI using aminated dendritic mesoporous silica (NH2-DMS) and lithium polyacrylate (PAALi) via electrostatic self-assembly.
- Characterization of the composite SEI's structure, ion transport properties, and interfacial stability.
- Evaluation of electrochemical performance in LMBs under high current density.
Main Results:
- The composite SEI exhibits homogeneous integration and enhanced interfacial stability due to electrostatic interactions.
- The NH2-DMS framework provides ion-transport channels, while PAALi chains facilitate rapid Li+ transport.
- Achieved a high Li+ transference number (tLi+) of 0.81, reduced polarization, and enabled dendrite-free lithium deposition.
- Demonstrated long-term cycling stability exceeding 2000 hours at 5 mA cm-2.
Conclusions:
- The synergistic combination of NH2-DMS and PAALi in the composite SEI layer promotes stable and dendrite-free lithium metal deposition.
- This artificial SEI strategy offers a promising approach for advancing the commercialization of high-performance lithium metal batteries.
