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Constructing a Li2O/LiZn Mixed Ionic Electron Conductive Layer by Ultrasonic Spraying to Enhance Li/Garnet Solid
Min Gao1, Pingmei Li1, Shihao Fu1
1State Key Laboratory of Marine Resource Utilization in South China Sea, School of Materials Science and Engineering, Hainan Provincial Key Laboratory of Research on Utilization of Si-Zr-Ti Resources, Hainan University, 58 Renmin Avenue, Haikou 570228, P. R. China.
A novel ZnO interlayer enhances solid-state battery performance by improving lithium metal contact and ionic conductivity. This strategy boosts critical current density and cycle stability for garnet-type solid electrolytes.
Area of Science:
- Materials Science
- Electrochemistry
- Solid-State Batteries
Background:
- Garnet-type Li6.25Ga0.25La3Zr2O12 (LGLZO) exhibits high ionic conductivity and stability, making it a promising solid electrolyte.
- Poor interfacial contact between lithium metal and LGLZO hinders practical application in solid-state batteries.
Purpose of the Study:
- To develop an effective method for improving the Li/LGLZO interface contact and electrochemical performance.
- To enhance the cycle stability and critical current density of solid-state batteries utilizing LGLZO.
Main Methods:
- A zinc oxide (ZnO) layer was deposited onto the LGLZO pellet surface using ultrasonic spraying.
- A mixed ionic and electron conductive (MIEC) layer (Li2O/LiZn) was formed at the Li/LGLZO interface through a conversion reaction between ZnO and molten lithium.
- Electrochemical testing and theoretical calculations were employed to analyze interfacial properties and battery performance.
Main Results:
- The fabricated MIEC layer significantly improved interfacial contact and optimized interfacial kinetics.
- Interface impedance was reduced to 36 Ω cm2, and critical current density reached 2.15 mA cm-2.
- Li/ZnO@LGLZO/LiFePO4 all-solid-state cells demonstrated stable cycling for 100 cycles at 0.5 C.
Conclusions:
- The ZnO interlayer and subsequent conversion reaction effectively create a beneficial MIEC layer at the Li/LGLZO interface.
- This approach successfully addresses the poor contact issue, leading to enhanced ionic conductivity and Li deposition.
- The strategy offers a viable pathway for improving the cycle performance of solid lithium metal batteries.
