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Poly(2,5-dimercapto-1,3,4-thiadiazole) as a cathode for rechargeable lithium batteries with dramatically improved
Jie Gao1, Michael A Lowe, Sean Conte
1Department of Chemistry and Chemical Biology, Cornell University, Ithaca, NY 14853-1301, USA.
Chemistry (Weinheim an Der Bergstrasse, Germany)
|May 31, 2012
Summary
Poly(2,5-dimercapto-1,3,4-thiadiazole) (PDMcT) cathodes show high capacity in ether-based electrolytes for lithium-ion batteries. This organosulfur compound offers promising, low-cost energy storage with good cycling performance.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Organosulfur compounds with thiol groups are explored for high energy density storage.
- Poly(2,5-dimercapto-1,3,4-thiadiazole) (PDMcT) is a potential cathode material.
Purpose of the Study:
- To synthesize and investigate the electrochemical performance of a PDMcT/poly(3,4-ethylenedioxythiophene) (PEDOT) composite cathode.
- To evaluate the effect of electrolyte chemistry on PDMcT performance in lithium-ion batteries.
Main Methods:
- Synthesis of PDMcT/PEDOT composite cathode.
- Electrochemical testing using charge/discharge cycles and cyclic voltammetry (CV).
- Comparison of performance in ether-based (tetra(ethylene glycol) dimethyl ether - TEGDME) and carbonate-based electrolytes.
Main Results:
- The PDMcT/PEDOT cathode achieved a high initial discharge capacity of 210 mAh g(-1) in TEGDME electrolyte.
- PDMcT demonstrated highly reversible redox reactions and retained 120 mAh g(-1) after 20 cycles in TEGDME.
- Poor performance in carbonate electrolyte was attributed to irreversible reactions.
Conclusions:
- TEGDME-based electrolytes significantly enhance the electrochemical performance of PDMcT cathodes.
- PDMcT is a promising, low-cost cathode material for lithium-ion batteries, especially with optimized electrolyte selection.
- Electrolyte chemistry is crucial for the stability and performance of molecular-based battery materials.
