Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 60, Issue 36, Pages 19852-19859Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202106027
Keywords
cobalt phthalocyanine; dendrite-free; electrolyte additives; lithium battery
Categories
Funding
- National Natural Science Foundation of China [51871113]
- Natural Science Foundation of Jiangsu Province [BK20200047]
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Fonds de Recherche du Qubec-Nature et Technologies (FRQNT)
- Canada Foundation for Innovation (CFI)
- Centre Quebecois sur les Materiaux Fonctionnels (CQMF)
- Institut National de la Recherche Scientifique (INRS)
- Fonds de recherche du Quebec-Nature et technologies (FRQNT)
- CFI
- NSERC
- University of Saskatchewan
- Government of Saskatchewan
- Western Economic Diversification Canada
- National Research Council Canada
- Canadian Institutes of Health Research
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The cobalt phthalocyanine electrolyte additive can effectively suppress the formation of Li dendrites, forming a dense molecular layer, which improves the cycling stability and reliability of lithium-metal batteries.
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 mu L mg(-1)).
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