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Updated: Mar 13, 2026
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Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature
Published on: December 20, 2016
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Dielectric-Mediated Solvation Chemistry Unlock Ah-Level Nail-Penetration-Resistant TiNb2O7 Pouch Cells Operating at
Shenglu Geng1, Yan Zhang1, Shengwei Dong1
1State Key Laboratory of Space Power-Sources, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, China.
Angewandte Chemie (International Ed. in English)
|March 12, 2026
Summary
Researchers developed a new electrolyte strategy for ultra-low-temperature lithium-ion batteries. This approach enhances ion transport and stability, enabling batteries to operate efficiently at extreme cold temperatures.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Ultra-low-temperature lithium-ion batteries struggle with slow ion movement and lithium dendrite formation.
- These issues significantly degrade battery performance and safety in cold environments.
Purpose of the Study:
- To enhance the low-temperature performance of lithium-ion batteries.
- To address challenges in ion transport and dendrite growth at sub-zero temperatures.
- To develop a molecular-level electrolyte design for extreme-condition batteries.
Main Methods:
- In situ tuning of interfacial kinetics using dielectric-mediated solvation engineering.
- Coupling solvation engineering with niobium-based oxides (TiNb2O7) anode.
- Theoretical calculations and in situ characterizations to understand interfacial chemistry.
Main Results:
- Dielectric-mediated solvation design regulated interfacial chemistry with weaker solvation and anion-rich shells.
- Achieved high rate capability (208.9 mAh g-1 at 50 C) and cycling stability (negligible degradation over 4500 cycles at -30°C).
- Demonstrated exceptional safety, with a 2 Ah pouch cell retaining 88.0% capacity after 3500 cycles at -30°C and operating at -60°C.
Conclusions:
- The proposed strategy effectively enhances low-temperature performance and cycling stability of lithium-ion batteries.
- Molecular-level electrolyte design is crucial for developing robust extreme-condition energy storage.
- This work offers a valuable guideline for future electrolyte development for batteries operating in harsh conditions.
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