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A Universal Design of Lithium Anode via Dynamic Stability Strategy for Practical All-Solid-State Batteries
Tao Deng1, Changhong Wang1, Hongli Wan1
1Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20742, USA.
Angewandte Chemie (International Ed. in English)
|December 23, 2024
Summary
This study introduces a novel design for thin lithium-metal anodes (LMAs) in all-solid-state batteries, overcoming dendrite issues for safer, high-energy applications. The dynamic stability strategy ensures uniform interfaces, enhancing battery performance and longevity.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- All-solid-state Li-metal batteries (ASSLBs) offer high energy density and safety but face challenges with Li-metal anode (LMA) dendrite formation and poor interfacial contact.
- These issues significantly hinder the practical application and long-term stability of rechargeable ASSLBs.
Purpose of the Study:
- To propose a universal design strategy for thin LMAs to address dendrite formation and interfacial contact problems in ASSLBs.
- To develop an ultra-thin LMA with enhanced Li-ion conductivity and stability for improved ASSLB performance.
Main Methods:
- In situ construction of an ultra-thin LMA (20 μm) using a dynamic stability strategy via electroplating.
- Formation of a uniform, highly Li-ion conductive solid-electrolyte interphase and a composite-polymer interphase (CPI) compatible with solid-state electrolytes (SSEs).
- Testing of Li symmetric cells with Li 6PS 5Cl thin film electrolytes and ASSLBs with Ni-rich cathodes.
Main Results:
- The engineered LMA demonstrated a high critical current density (>2.0 mA cm -2) and excellent cycling stability at 1.0 mA cm -2 in Li symmetric cells.
- ASSLBs utilizing the engineered LMA exhibited good rate capability (0.1 C to 1.0 C) and long-term cycling stability (81% retention after 100 cycles) at room temperature.
- The composite-polymer interphase effectively dissolved passivation layers and reduced surface resistance due to its compatibility with SSEs.
Conclusions:
- The dynamic stability strategy provides a general pathway for fabricating thin, dendrite-free LMAs for high-energy-density ASSLBs.
- The engineered LMA design significantly improves cycling stability and rate capability, paving the way for practical ASSLB applications.
- This approach addresses key interfacial challenges, enhancing the overall performance and reliability of solid-state batteries.
