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Adjustable Mixed Conductive Interphase for Dendrite-Free Lithium Metal Batteries
Liang Lin1, Fang Liu1, Yinggan Zhang1
1State Key Lab for Physical Chemistry of Solid Surfaces, Fujian Key Laboratory of Surface and Interface Engineering for High Performance Materials (Xiamen University), College of Materials, Xiamen University, Xiamen 361005, China.
ACS Nano
|August 10, 2022
Summary
This study introduces a novel mixed ionic and electronic conductive interphase for lithium metal batteries, significantly improving cycling stability and capacity retention for next-generation energy storage applications.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Lithium metal batteries offer high energy density but face challenges with lithium dendrite growth and unstable solid electrolyte interphases.
- Developing stable and efficient interphases is crucial for advancing next-generation energy storage.
Purpose of the Study:
- To engineer a mixed ionic and electronic conductive (MIEC) interphase layer for lithium metal batteries.
- To enhance the stability and performance of lithium metal batteries by addressing dendrite growth and interphase issues.
Main Methods:
- Fabrication of a tunable MIEC interphase using zinc oxide (ZnO) and zinc (Zn) nanoparticles.
- In situ characterization of the interphase during the initial battery cycling.
- Electrochemical testing of symmetric cells and Li||LiFePO4 full cells.
Main Results:
- The in situ formed Li2O and LiZn alloy within the MIEC interphase facilitate rapid Li+ transportation and charge transfer.
- Optimized interface kinetics were achieved by balancing ion migration and charge transfer.
- Symmetric cells demonstrated over 1200 hours of stable cycling.
- Full cells achieved 2000 cycles with 91.5% capacity retention at 5 C and stable cycling at high LFP loading.
Conclusions:
- The developed MIEC interphase effectively suppresses lithium dendrite growth and stabilizes the solid electrolyte interphase.
- This approach significantly enhances the cycling stability and rate capability of lithium metal batteries.
- The findings pave the way for practical, high-energy-density lithium metal batteries.
