Mitigating Interfacial Capacity Fading in Vanadium Pentoxide by Sacrificial Vanadium Sulfide Encapsulation for Rechargeable Mg-Ion Batteries

Ayan Mukherjee; Sankalpita Chakrabarty; Sarah Taragin; Eliran Evinstein; Piyali Bhanja; Akanksha Joshi; Hagit Aviv; Ilana Perelshtein; Mamata Mohapatra; Suddhasatwa Basu; Malachi Noked

doi:10.1002/smll.202308886

Mitigating Interfacial Capacity Fading in Vanadium Pentoxide by Sacrificial Vanadium Sulfide Encapsulation for Rechargeable Mg-Ion Batteries

Small. 2024 Jan 4:e2308886. doi: 10.1002/smll.202308886. Online ahead of print.

Authors

Ayan Mukherjee^{1

2

3}, Sankalpita Chakrabarty^{1

2}, Sarah Taragin^{1

2}, Eliran Evinstein^{1

2}, Piyali Bhanja³, Akanksha Joshi^{1

2}, Hagit Aviv^{1

2}, Ilana Perelshtein², Mamata Mohapatra³, Suddhasatwa Basu⁴, Malachi Noked^{1

2}

Affiliations

¹ Department of Chemistry, Bar Ilan University, Ramat Gan, 5290002, Israel.
² Bar-Ilan Institute of Nanotechnology and Advanced Materials, Ramat Gan, 5290002, Israel.
³ CSIR-Institute of Minerals and Materials Technology Bhubaneswar, Bhubaneswar, 713013, India.
⁴ Department of Chemical Engineering, Indian Institute of Technology Delhi, Delhi, 110015, India.

PMID: 38174607
DOI: 10.1002/smll.202308886

Abstract

Rechargeable Mg-ion Batteries (RMB) containing a Mg metal anode offer the promise of higher specific volumetric capacity, energy density, safety, and economic viability than lithium-ion battery technology, but their realization is challenging. The limited availability of suitable inorganic cathodes compatible with electrolytes relevant to Mg metal anode restricts the development of RMBs. Despite the promising capability of some oxides to reversibly intercalate Mg⁺² ions at high potential, its lack of stability in chloride-containing ethereal electrolytes, relevant to Mg metal anode hinders the realization of a full practical RMB. Here the successful in situ encapsulation of monodispersed spherical V₂ O₅ (≈200 nm) is demonstrated by a thin layer of VS₂ (≈12 nm) through a facile surface reduction route. The VS₂ layer protects the surface of V₂ O₅ particles in RMB electrolyte solution (MgCl₂ + MgTFSI in DME). Both V₂ O₅ and V₂ O₅ @VS₂ particles demonstrate high initial discharge capacity. However, only the V₂ O₅ @VS₂ material demonstrates superior rate performance, Coulombic efficiency (100%), and stability (138 mA h g^-1 discharge capacity after 100 cycles), signifying the ability of the thin VS₂ layer to protect the V₂ O₅ cathode and facilitate the Mg⁺² ion intercalation/deintercalation into V₂ O₅ .

Keywords: Mg-ion battery; electrochemistry; surface coating.

Abstract

Grants and funding