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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
Published on: August 12, 2013
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Micromechanism in All-Solid-State Alloy-Metal Batteries: Regulating Homogeneous Lithium Precipitation and Flexible
Jing Wan1,2, Yue-Xian Song1,2, Wan-Ping Chen1,2
1Key Laboratory of Molecular Nanostructure and Nanotechnology, Beijing National Laboratory for Molecular Sciences, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, People's Republic of China.
Journal of the American Chemical Society
|December 31, 2020
Summary
Researchers studied lithium metal anodes in solid-state batteries using alloy anodes. They observed lithium deposition and dissolution behaviors, revealing mechanisms for improved battery cycling and performance.
Area of Science:
- Materials Science
- Electrochemistry
- Battery Technology
Background:
- Sulfide-based solid-state electrolytes (SSEs) paired with alloy anodes offer a promising alternative to traditional lithium-ion batteries.
- Challenges remain in understanding the dynamic electrochemical processes occurring at the alloy anode interface within SSEs.
- Overcoming the limitations of pure lithium metal anodes is crucial for advancing all-solid-state batteries (ASSBs).
Purpose of the Study:
- To investigate the dynamic electrochemical processes of lithium deposition and dissolution on alloy anodes in sulfide-based SSEs.
- To uncover the morphological evolution and nanoscale behavior of lithium precipitation and dissolution.
- To elucidate the microscopic precipitation mechanisms regulated by alloy anodes and the role of the solid electrolyte interphase (SEI).
Main Methods:
- Utilized in situ atomic force microscopy (AFM) to observe dynamic processes at the electrode-electrolyte interface.
- Investigated lithium precipitation and dissolution behaviors on lithium and indium electrodes.
- Analyzed the formation and characteristics of the solid electrolyte interphase (SEI) on alloy anodes.
Main Results:
- Observed distinct block-formation and stack-accumulation behaviors during lithium precipitation on Li electrodes.
- Uncovered the morphological evolution of nanoscale lithium deposition and dissolution in ASSBs.
- Identified two-dimensional Li-indium (In) alloy lamellae and a homogeneous SEI shell on the In electrode.
- Demonstrated that a flexible, wrinkle-structure SEI shell enhances electrode protection and lithium accommodation during cycling.
Conclusions:
- The study provides critical insights into the dynamic electrochemical processes of lithium metal anodes in sulfide-based SSEs.
- Understanding the morphological evolution and SEI formation is key to optimizing alloy-based ASSBs.
- The findings facilitate the development of more stable and efficient all-solid-state batteries with alloy anodes.
