Characterization of Lithium Electrode in Lithium Imides/Ethylene Carbonate, and Cyclic Ether Electrolytes
| Autor: | Eiki Yasukawa, Hitoshi Ota, Xianming Wang |
|---|---|
| Rok vydání: | 2004 |
| Předmět: |
Renewable Energy
Sustainability and the Environment Scanning electron microscope Inorganic chemistry chemistry.chemical_element Electrolyte Condensed Matter Physics Dimethoxyethane Surfaces Coatings and Films Electronic Optical and Magnetic Materials chemistry.chemical_compound chemistry Ternary compound Materials Chemistry Electrochemistry Lithium Lithium oxide Tetrahydrofuran Ethylene carbonate |
| Zdroj: | Journal of The Electrochemical Society. 151:A427 |
| ISSN: | 0013-4651 |
| Popis: | The surface and cross-sectional morphologies of deposited lithium on a nickel substrate in LiN(SO 2 C 2 F 5 ) 2 (LiBETI) electrolytes with ethylene carbonate (EC) + tetrahydropyran (THP), dimethoxyethane, dimethylcarbonate (DMC), propylenecarbonate (PC), γ-butyrolactone (GBL) (1:1) binary solvents were investigated by scanning electron microscopy observation. Dendritic morphology of deposited lithium was observed in DMC-, PC-, and GBL-containing solvents. However, deposited lithium in a EC + THP electrolyte exhibited a fine particle-like morphology and had a thinner surface film. The EC + THP electrolyte provided excellent performance based on the results of cycling characteristics using a Li/LiCoO 2 cell and Li/Ni cell. The morphology of deposited lithium in an EC + tetrahydrofuran electrolyte was strongly influenced by the kind of solutes. In LiBETI electrolyte, freshly deposited lithium exhibited uniform and fine particle-like morphology. In contrast, dendritic morphology was observed in LiN(SO 2 C 2 F 5 ) 2 (LiTFSI) electrolyte, resulting in a subsequent decrease in the lithium cycling efficiency. Electrolyte temperature was also an important factor influencing the lithium surface and efficiency. The use of LiTFSI electrolyte at elevated temperatures could suppress dendritic formation, resulting in excellent efficiency and cycling characteristics. We confirmed that the lithium surface morphology correlated well with the lithium cycling efficiency and the efficiency was strongly influenced by combinations of solvents and solutes. |
| Databáze: | OpenAIRE |
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