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Ferroelectric Nanorods as a Polymer Interface Additive for High-Performance Garnet-Based Solid-State Batteries
Zhuohua Li1, Xiaojin Wang1, Xueying Lin1
1School of Chemistry, Engineering Research Center of MTEES (Ministry of Education), South China Normal University, Guangzhou, Guangdong 510006, China.
ACS Applied Materials & Interfaces
|July 12, 2023
Summary
Introducing ferroelectric barium titanate (BaTi2O5) nanorods into polymer interlayers significantly enhances solid-state battery performance by improving ionic conductivity, mechanical strength, and reducing degradation, paving the way for practical applications.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Polymer interlayers in garnet-based solid-state batteries face challenges like low ionic conductivity, poor Li+ transference, and inadequate mechanical properties.
- These interfacial issues hinder the practical application of solid-state battery technology.
Purpose of the Study:
- To address the limitations of polymer interlayers in solid-state batteries.
- To enhance ionic conductivity, Li+ transference number, and mechanical properties of polymer interlayers simultaneously.
- To improve the overall electrochemical performance and stability of garnet-based solid-state batteries.
Main Methods:
- Incorporation of ferroelectric BaTi2O5 (BT) nanorods into a polymer matrix to create modified interlayers.
- Utilizing the plasticization effect and spontaneous polarization of BT nanorods.
- Fabrication and testing of lithium symmetric cells and full solid-state batteries with garnet solid electrolytes and BT-modified polymer interlayers.
Main Results:
- Significant enhancement in ionic conductivity and Li+ transference number of the polymer interlayer.
- Improved mechanical properties of the polymer film, enhancing resistance to lithium dendrite growth.
- Stable cycling performance in lithium symmetric cells (1000 h) and superior capacity retention in full cells (94.6% after 200 cycles).
Conclusions:
- Ferroelectric BaTi2O5 nanorods effectively mitigate interfacial issues in solid-state batteries.
- The modified polymer interlayers demonstrate enhanced ionic, mechanical, and electrochemical properties.
- This approach highlights the potential of ferroelectric materials with specific morphologies for advancing solid-state battery technology.
