Related Experiment Video
Updated: May 30, 2025
07:20
Screening of Coatings for an All-Solid-State Battery Using In Situ Transmission Electron Microscopy
Published on: January 20, 2023
2.5K
Data-driven exploration of weak coordination microenvironment in solid-state electrolyte for safe and energy-dense
Zhoujie Lao1, Kehao Tao2,3, Xiao Xiao1
1Shenzhen Geim Graphene Center, Tsinghua-Berkeley Shenzhen Institute & Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, P. R. China.
Nature Communications
|January 27, 2025
Summary
Researchers developed novel Hofmann complexes for solid polymer electrolytes, enhancing lithium-ion conductivity for safer batteries. These materials enable rapid ion transport, improving battery performance and longevity.
Area of Science:
- Materials Science
- Electrochemistry
- Computational Chemistry
Background:
- Solid polymer electrolytes (SPEs) are crucial for safer batteries but suffer from low ionic conductivity, hindering their adoption.
- Existing plasticizers improve lithium-ion conduction, yet a lack of microenvironment understanding limits high-performance SPE design.
- Hofmann complexes offer a new avenue for creating SPEs with enhanced ionic transport properties.
Purpose of the Study:
- To design novel Hofmann complexes for SPEs with continuous 2D lithium-ion conduction channels.
- To investigate the relationship between lithium coordination environment and ion conduction kinetics.
- To develop highly conductive SPEs for advanced lithium-ion battery applications.
Main Methods:
- Design and synthesis of Hofmann complexes with functional ligands.
- Utilized unsupervised learning and Climbing Image-Nudged Elastic Band (CI-NEB) simulations to screen potential lithium-ion conductors.
- Fabricated and tested Li||sulfurized polyacrylonitrile (SPAN) cells using the developed SPEs.
Main Results:
- Identified five potential lithium-ion conductors and elucidated the impact of lithium coordination on conduction.
- Demonstrated that adjusting Metal-O and Li-O bond covalency enables manipulation of the lithium-ion coordination environment for rapid kinetics.
- Achieved an initial discharge capacity of 1264 mAh g⁻¹ in a Li||SPAN cell with Co(dimethylformamide)₂Ni(CN)₄ SPE, retaining 65% after 500 cycles at 0.2 C.
- A 0.6 Ah Li||SPAN pouch cell exhibited an areal discharge capacity of 3.8 mAh cm⁻² with a low mass loading of 18.6 mg cm⁻².
Conclusions:
- The designed Hofmann complexes provide continuous 2D channels for highly conductive solid-state polymer electrolytes.
- The study highlights the importance of controlling the lithium coordination environment for optimizing ionic conductivity.
- The developed SPEs show promise for high-performance and safe lithium-ion batteries.
