Super-Reversible CuF2 Cathodes Enabled by Cu2+ -Coordinated Alginate

Bibliographische Detailangaben
Veröffentlicht in:	Advanced materials (Deerfield Beach, Fla.). - 1998. - 34(2022), 43 vom: 04. Okt., Seite e2205229
1. Verfasser:	Xia, Jiale (VerfasserIn)
Weitere Verfasser:	Wang, Zeyi, Rodrig, Nuwanthi D, Nan, Bo, Zhang, Jiaxun, Zhang, Weiran, Lucht, Brett L, Yang, Chongyin, Wang, Chunsheng
Format:	Online-Aufsatz
Sprache:	English
Veröffentlicht:	2022
Zugriff auf das übergeordnete Werk:	Advanced materials (Deerfield Beach, Fla.)
Schlagworte:	Journal Article Li-ion batteries copper fluoride cross-link effect hydroxylated copper fluoride sodium alginate

Beschreibung
Zusammenfassung:	© 2022 Wiley-VCH GmbH. Copper fluoride (CuF2 ) has the highest energy density among all metal fluoride cathodes owing to its high theoretical potential (3.55 V) and high capacity (528 mAh g-1 ). However, CuF2 can only survive for less than five cycles, mainly due to serious Cu-ion dissolution during charge/discharge cycles. Herein, copper dissolution is successfully suppressed by forming Cu2+ -coordinated sodium alginate (Cu-SA) on the surface of CuF2 particles during the electrode fabrication process, by using water as a slurry solvent and sodium alginate (SA) as a binder. The trace dissolved Cu2+ in water from CuF2 can in situ cross-link with SA binder forming a conformal Cu-SA layer on CuF2 surface. After water evaporation during the electrode dry process, the Cu-SA layer is Li-ion conductor but Cu2+ insulator, which can effectively suppress the dissolution of Cu-ions in the organic 4 m LiClO4 /ethylene carbonate/propylene carbonate electrolyte, enhancing the reversibility of CuF2 . CuF2 electrode with SA binder delivers a reversible capacity of 420.4 mAh g-1 after 50 cycles at 0.05 C, reaching an energy density of 1009.1 Wh kg-1 . Cu2+ cross-link polymer coating on CuF2 opens the door for stabilizing the high-energy and low-cost CuF2 cathode for next-generation Li-ion batteries
Beschreibung:	Date Revised 26.10.2022 published: Print-Electronic Citation Status PubMed-not-MEDLINE
ISSN:	1521-4095
DOI:	10.1002/adma.202205229