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TiO2 Nanofiber-Modified Lithium Metal Composite Anode for Solid-State Lithium Batteries.
Yuwei Chen1, Ying Huang1, Haoyu Fu1
1Institute of New Energy for Vehicles, Shanghai Key Laboratory of Development & Application for Metallic Functional Materials, School of Materials Science and Engineering, Tongji University, Shanghai 201804, China.
ACS Applied Materials & Interfaces
|June 10, 2021
Summary
Introducing 1D TiO2 nanofibers into lithium metal anodes significantly improves solid-state lithium metal battery performance by enhancing interface wettability with garnet electrolytes, reducing interfacial resistance, and enabling stable cycling.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Solid-state lithium metal batteries (SSLMBs) offer high energy density and safety.
- Poor interface contact between lithium metal anodes and garnet electrolytes (LLZTO) hinders SSLMB performance.
Purpose of the Study:
- To enhance interface wettability between lithium metal anodes and LLZTO electrolytes.
- To improve the overall performance and stability of SSLMBs.
Main Methods:
- Incorporation of 1D TiO2 nanofibers into lithium metal to create a Li-lithiated TiO2 composite anode (Li-TiO2).
- Characterization of interfacial resistance and electrochemical performance of symmetric and full cells.
Main Results:
- The Li-TiO2 composite anode achieved a significantly reduced interfacial resistance (27 Ω cm² compared to 374 Ω cm² for pristine lithium).
- Symmetric cells demonstrated improved critical current density (2.2 mA cm⁻²) and stable cycling over 550 hours.
- Full cells utilizing the Li-TiO2 anode exhibited stable cycling performance.
Conclusions:
- 1D TiO2 nanofibers effectively enhance interface contact between lithium metal anodes and garnet electrolytes.
- This approach provides a viable strategy for overcoming interface challenges in SSLMBs, improving their performance and stability.
