Cobalt-Phthalocyanine-Derived Molecular Isolation Layer for Highly Stable Lithium Anode
| Autor: | Dongniu Wang, Hongliu Dai, Chao Lai, Lucia Zuin, Shuhui Sun, Mingjie Wu, Jing Dong, Ning Chen, Qingmin Hu, Gaixia Zhang |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Lithium iron phosphate Lithium carbonate Lithium fluoride chemistry.chemical_element 02 engineering and technology General Medicine General Chemistry Electrolyte 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 7. Clean energy Space charge Catalysis Lithium battery 0104 chemical sciences Anode chemistry.chemical_compound chemistry Chemical engineering Lithium 0210 nano-technology |
| Zdroj: | Angewandte Chemie (International ed. in English). 60(36) |
| ISSN: | 1521-3773 |
| Popis: | The uneven consumption of anions during the lithium (Li) deposition process triggers a space charge effect that generates Li dendrites, seriously hindering the practical application of Li-metal batteries. We report on a cobalt phthalocyanine electrolyte additive with a planar molecular structure, which can be tightly adsorbed on the Li anode surface to form a dense molecular layer. Such a planar molecular layer cannot only complex with Li ions to reduce the space charge effect, but also suppress side reactions between the anode and the electrolyte, producing a stable solid electrolyte interphase composed of amorphous lithium fluoride (LiF) and lithium carbonate (LiCO3 ), as verified by X-ray absorption near-edge spectroscopy. As a result, the Li|Li symmetric cell exhibits excellent cycling stability above 700 h under a high plating capacity of 3 mAh cm-2 . Moreover, the assembled Li|lithium iron phosphate (LiFePO4 , LFP) full-cell can also deliver excellent cycling over 200 cycles under lean electrolyte conditions (3 μL mg-1 ). |
| Databáze: | OpenAIRE |
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