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Stabilizing a Li1.3Al0.3Ti1.7(PO4)3/Li metal anode interface in solid-state batteries with a LiF/Cu-rich
Decheng Ding1,2, Hui Ma3, Huachao Tao2,4
1College of Electrical Engineering & New Energy, China Three Gorges University Yichang Hubei 443002 China.
Chemical Science
|March 8, 2024
Summary
A new CuF2 composite layer improves lithium-ion battery performance by stabilizing the lithium metal interface with LATP solid electrolytes. This enhances conductivity and cycle life for safer, more efficient batteries.
Area of Science:
- Materials Science
- Electrochemistry
- Solid-State Batteries
Background:
- Lithium 1.3Al0.3Ti1.7(PO4)3 (LATP) is a promising solid electrolyte for all-solid-state lithium batteries due to its high ionic conductivity, air stability, and low cost.
- However, LATP suffers from poor compatibility with lithium metal and high interfacial impedance, hindering its practical application.
Purpose of the Study:
- To develop a simple and effective method to address the interfacial challenges between LATP and lithium metal.
- To improve the interfacial contact, electrochemical stability, and dendrite suppression in LATP-based solid-state batteries.
Main Methods:
- A CuF2 composite layer was constructed on the Li/LATP interface using a drop coating method.
- The interfacial properties and electrochemical performance of the modified interface were investigated using symmetric and full battery configurations.
Main Results:
- The CuF2 layer reacted in situ with lithium metal to form a LiF- and Cu-rich interface, enhancing interfacial contact and electrochemical stability.
- Interfacial resistance was significantly reduced from 562 to 92 Ω, and critical current density increased to 1.7 mA cm-2.
- Li/CuF2@LATP/Li symmetric batteries demonstrated exceptional cycle stability exceeding 6000 hours.
- LiFePO4/CuF2@LATP/Li full cells achieved 80.3% capacity retention after 540 cycles.
Conclusions:
- The CuF2 composite layer effectively solves the interfacial issues of Li/LATP, enabling stable and high-performance solid-state lithium batteries.
- This simple composite layer strategy offers a viable solution for advancing LATP-based battery technology.
