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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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Polymorphism in Ionic Cocrystals Comprising Lithium Salts and l-Proline.
Rana Sanii1, Yassin H Andaloussi1, Ewa Patyk-Kaźmierczak2
1Department of Chemical Sciences and Bernal Institute, University of Limerick, Co., Limerick V94T9PX, Ireland.
Crystal Growth & Design
|September 26, 2022
Summary
Polymorphism in lithium salicylate-l-proline and lithium 4-methoxybenzoate-l-proline cocrystals was studied. New crystal forms were discovered, with insights into their stability and transformation conditions.
Area of Science:
- Solid-state chemistry
- Crystallography
- Materials science
Background:
- Polymorphism is crucial for cocrystal properties.
- Ionic cocrystals offer tunable characteristics.
- Lithium salts and amino acids are building blocks for novel materials.
Purpose of the Study:
- Investigate polymorphism in lithium salicylate-l-proline (LISPRO) and lithium 4-methoxybenzoate-l-proline (L4MPRO) ionic cocrystals.
- Characterize new polymorphs and their structural differences.
- Determine conditions for polymorphic transformations.
Main Methods:
- Cocrystal synthesis and crystallization.
- Powder X-ray diffraction (PXRD) for structural analysis.
- Solid-state characterization techniques.
Main Results:
- LISPRO exists in two polymorphs (monoclinic α and orthorhombic β), with α transforming to β under slurry conditions.
- L4MPRO exhibits three polymorphs (orthorhombic α and two monoclinic forms, β and γ).
- New L4MPRO polymorphs are metastable and transform to the α form in humid conditions.
Conclusions:
- Detailed understanding of LISPRO and L4MPRO polymorphism.
- Identification of key factors influencing cocrystal structural diversity.
- Insights into cocrystal stability and transformation pathways relevant to materials design.
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