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Development of Fluorine-Free Electrolytes for Aqueous-Processed Olivine-Type Phosphate Cathodes
Claudia Limachi1,2,3, Klaudia Rogala1, Marek Broszkiewicz1
1Faculty of Chemistry, Warsaw University of Technology, 00-664 Warsaw, Poland.
Molecules (Basel, Switzerland)
|October 16, 2024
Summary
Researchers developed a new fluorine-free electrolyte using lithium 1,1,2,3,3-pentacyanopropenide (LiPCP) salt for sustainable lithium-ion batteries. This advancement supports aqueous-processed, cobalt-free cathodes, enhancing environmental compatibility.
Area of Science:
- Materials Science
- Electrochemistry
- Sustainable Energy
Background:
- Growing environmental concerns necessitate sustainable alternatives for lithium-ion batteries.
- Current battery technologies face challenges with resource availability and environmental impact.
- Cobalt-free cathode materials and fluorine-free electrolytes are key areas for greener battery development.
Purpose of the Study:
- To develop novel fluorine-free electrolytes compatible with aqueous-processed cobalt-free cathode materials.
- To investigate the performance of a new electrolyte based on lithium 1,1,2,3,3-pentacyanopropenide (LiPCP) salt.
- To assess the suitability of LiFePO4 and LiMn0.6Fe0.4PO4 as cobalt-free cathode materials processed in an aqueous medium.
Main Methods:
- Screening of organic carbonate solvents (ethylene carbonate and dimethyl carbonate) and LiPCP salt concentrations.
- Optimization of electrolyte composition, including the use of vinylene carbonate as a SEI-stabilizing additive.
- Aqueous processing of LiFePO4 and LiMn0.6Fe0.4PO4 cathodes using sodium carboxymethyl cellulose binder.
- Electrochemical performance evaluation using cyclic voltammetry and galvanostatic cycling against a LiPF6-based electrolyte.
Main Results:
- An optimal electrolyte conductivity of 9.6 mS·cm-1 was achieved at 0.8 mol·kg-1 LiPCP concentration in a 30:70 wt.% EC:DMC solvent mixture.
- The developed electrolyte exhibited stability up to 4.4 V vs. Li+/Li.
- Aqueous-processed LiFePO4 and LiMn0.6Fe0.4PO4 cathodes demonstrated good compatibility and performance, achieving capacities of 160 mAh·g-1 and 70 mAh·g-1 at C/10, respectively.
- Optimized cathode compositions (87:10:3 active material:conductive additive:binder) showed enhanced performance.
Conclusions:
- The study presents the first investigation into LiPCP-based electrolytes for greener lithium-ion batteries.
- The developed fluorine-free electrolyte is compatible with aqueous-processed cobalt-free cathode materials.
- This work represents a significant step towards developing more sustainable and environmentally friendly lithium-ion battery technologies.
Keywords:
aqueous bindersaqueous electrodesfluorine-free lithium saltsgreen chemistrylithium-ion batteriessustainabilityMore Related Videos
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