Hollow quasi-polyhedron structure of NiCoP with strong constraint sulfur effect for lithium sulfur battery

Double metal phosphide NiCoP with hollow quasi-polyhedron structure was rationally designed and synthesized via acidic etching, precipitation of ZIF-67 polyhedra and further phosphorization treatment. The outer and inside shells of the hollow quasi-polyhedral structure were formed by many interconne...

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Published inJournal of electroanalytical chemistry (Lausanne, Switzerland) Vol. 847; p. 113187
Main Authors Duan, Jinliang, Zou, Youlan, Li, Zhaoyang, Long, Bo, Du, Yanyan
Format Journal Article
LanguageEnglish
Published Amsterdam Elsevier B.V 15.08.2019
Elsevier Science Ltd
Subjects
Adsorption
Bonding strength
Double metal phosphide
Lithium sulfur batteries
Lithium sulfur battery
Oxidation
Phosphating (coating)
Phosphides
Polyhedra
Polysulfides
ZIF-67
Adsorption
Lithium sulfur battery
Double metal phosphide
ZIF-67
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Summary:Double metal phosphide NiCoP with hollow quasi-polyhedron structure was rationally designed and synthesized via acidic etching, precipitation of ZIF-67 polyhedra and further phosphorization treatment. The outer and inside shells of the hollow quasi-polyhedral structure were formed by many interconnected nanosheets with a lot of micro-holes. It could be found that this unique 3D structure material could be well applied to lithium sulfur battery (LSB). The NiCoP material with a huge specific surface area (1539.2m2g−1) allowed for high loading of sulfur. The NiCoP material strongly adsorbed polysulfides because their natural oxidation (forming Ni-O-P, Co-O-P-like species) activated the Co/Ni sites for binding polysulfides via strong CoS, NiS bonding. In particular, NiCoP hollow quasi-polyhedra exhibited higher binding energy than CoP. The results revealed that this composite had a specific discharge capacity up to 815.3mAh/g at the first cycle and remained 620mAh/g after cycling for 200 at 0.1C with almost 100% coulombic efficiency. •Double metal phosphide NiCoP encapsulated sulfur composite is prepared.•S anchored in the slits between layers, the outside holes and the inside pores•The existence of the oxided layer has strong adsorption for the polarity of polysulfides.•It provides considerable cycle stability for energy storage.
ISSN:1572-6657
1873-2569
DOI:10.1016/j.jelechem.2019.113187