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Updated: May 15, 2025
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Elemental-sensitive Detection of the Chemistry in Batteries through Soft X-ray Absorption Spectroscopy and Resonant Inelastic X-ray Scattering
Published on: April 17, 2018
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Rare-Earth Ions Regulating Lattice-Softened Bromide Solid Electrolytes for Highly Stable Fast-Charging Solid-State
Xiaomeng Shi1, Zhichao Zeng1, Qian Zhang2
1Tianjin Key Laboratory for Rare Earth Materials and Applications, Center for Rare Earth and Inorganic Functional Materials, Smart Sensing Interdisciplinary Science Center, School of Materials Science and Engineering, National Institute for Advanced Materials, Nankai University, 38 Tongyan Road, Jinnan District, Tianjin 300350, P. R. China.
Nano Letters
|May 3, 2025
Summary
Researchers developed a new solid-state electrolyte for safer, high-energy lithium batteries. Gadolinium-based lithium halide electrolytes show excellent deformability and stability, enabling fast charging and long cycle life in all-solid-state lithium-based batteries.
Area of Science:
- Materials Science
- Electrochemistry
- Solid-State Batteries
Background:
- All-solid-state lithium-based batteries (ASSLBs) offer enhanced safety and energy density.
- High-performance solid-state electrolytes (SEs) with good processability are crucial for stable and efficient ASSLBs.
- Bromide (Br)-based rare-earth halide SEs (RE-HSEs) show promise due to ion deformability.
Purpose of the Study:
- To investigate the influence of rare-earth (RE) ions on the crystalline structure and mechanical properties of Br-based RE-HSEs.
- To identify optimal RE-HSEs for improved ASSLB performance.
- To establish the structure-property relationship for designing advanced solid-state electrolytes.
Main Methods:
- Systematic analysis of crystalline structure and mechanical properties of Br-based RE-HSEs (RE = Y, Gd, Tb, Ho, Er).
- Evaluation of ionic conductivity of selected electrolytes.
- Fabrication and electrochemical testing of ASSLBs using Li3GdBr6 (LGdB) electrolyte.
Main Results:
- Li3GdBr6 (LGdB) exhibited the softest lattice and best deformability, attributed to the longest RE-Br bond length.
- LGdB demonstrated satisfactory ionic conductivity (1.4 mS cm⁻¹).
- Assembled ASSLBs showed reversible redox, excellent fast-charging capability, and superior cycling stability for 6000 cycles at 10 C.
Conclusions:
- The RE ion significantly impacts the deformability of Br-based RE-HSEs.
- LGdB is a promising solid-state electrolyte for high-performance ASSLBs.
- Understanding the RE-deformability relationship is key for rational design and improvement of halide solid electrolytes.
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