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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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A Multilayer Ceramic Electrolyte for All-Solid-State Li Batteries
Jianxun Zhu1, XiaoLei Li1, Changwei Wu1
1Beijing Advanced Innovation Center for Soft Matter Science and Engineering, State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing, 100029, China.
Angewandte Chemie (International Ed. in English)
|November 11, 2020
Summary
A new dual-layer ceramic electrolyte using Ti-doped LLZTO improves lithium-metal battery stability. This design reduces interfacial resistance and prevents lithium dendrite penetration, enabling stable lithium plating and stripping.
Area of Science:
- Solid-state electrochemistry
- Materials science for energy storage
Background:
- Lithium-metal batteries (LMBs) offer high energy density but face challenges with Li-metal anode stability.
- Garnet-type solid electrolytes like Li6.75La3Zr1.75Ta0.25O12 (LLZTO) show good chemical stability with Li-metal but suffer from high interfacial resistance and Li-metal penetration.
- Interfacial issues hinder the practical application of LLZTO-based solid-state batteries.
Purpose of the Study:
- To develop a dual-layer ceramic electrolyte to overcome the interfacial limitations of LLZTO with Li-metal anodes.
- To enhance the interfacial contact, reduce resistance, and suppress dendrite growth in LLZTO-based solid-state batteries.
- To achieve stable and efficient cycling of Li-metal anodes in solid-state lithium-metal batteries.
Main Methods:
- Fabrication of a dual-layer ceramic electrolyte consisting of Ti-doped LLZTO (Ti-LLZTO) and LLZTO.
- Utilizing the Ti-LLZTO layer in contact with the Li-metal anode and the LLZTO layer in contact with the cathode.
- Investigating the in-situ reduction of Ti-LLZTO by Li-metal to form a mixed ion-electron conducting layer.
- Characterizing the interfacial properties, ionic/electronic flux, and electrochemical performance.
Main Results:
- The dual-layer structure with Ti-LLZTO/LLZTO exhibited identical crystal structures, ensuring seamless contact and barrierless Li+ transport.
- The density of Ti-LLZTO pellets was higher than that of LLZTO.
- In-situ reduction of Ti-LLZTO by Li-metal improved interfacial wettability and created a mixed ion-electron conducting layer.
- These interfacial modifications effectively reduced defects/pores, homogenized flux, lowered interfacial resistance, and suppressed dendrite formation.
- Stable lithium plating/stripping was achieved at an areal capacity of 3.0 mAh cm−2.
Conclusions:
- The Ti-LLZTO/LLZTO dual-layer ceramic electrolyte effectively addresses the interfacial challenges of LLZTO with Li-metal anodes.
- The developed interface promotes uniform Li+ flux, enhances stability, and suppresses dendrite growth, paving the way for practical solid-state lithium-metal batteries.
- This strategy offers a promising approach for designing stable and high-performance solid electrolytes for next-generation energy storage devices.
Keywords:
Li metal anodeinterfacemixed ion-electron conductorsmulti-layer ceramicsolid state batteriesMore Related Videos
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