Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 59, Issue 5, Pages 1975-1979Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201910474
Keywords
anodes; lithium-ion batteries; low-temperature synthesis; metal phosphides; phosphorus-rich phase
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Funding
- MOST of China [2018YFB1502102]
- National Science Foundation of China (NSFC) [21771006, U1607126, 51431001, 51771002, 21621061]
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Phosphorus-rich metal phosphides have very high lithium storage capacities, but they are difficult to prepare. A low-temperature phosphorization method based on Mg reducing PCl3 in ZnCl2 molten salt at 300 degrees C is developed to synthesize phosphorus-rich CuP2@C from a Cu-MOF derived Cu@C composite. Abnormal oxidation of Cu by Zn2+ in the molten salt is observed, which leads to the porous honeycomb nanostructure and homogeneously distributed ultrafine CuP2 nanocrystals. The honeycomb CuP2@C exhibits excellent lithium storage performance with high reversible capacity (1146 mAh g(-1) at 0.2 A g(-1)) and superior cycling stability (720 mAh g(-1) after 600 cycles at 1.0 A g(-1)), showing the promising application of P-rich metal phosphides in lithium ion batteries.
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