Unraveling the Role of Fluorinated Alkyl Carbonate Additives in Improving Cathode Performance in Sodium-Ion Batteries

Amey Nimkar; Netanel Shpigel; Fyodor Malchik; Shaul Bublil; Tianju Fan; Tirupathi Rao Penki; Merav Nadav Tsubery; Doron Aurbach

doi:10.1021/acsami.1c03844

Unraveling the Role of Fluorinated Alkyl Carbonate Additives in Improving Cathode Performance in Sodium-Ion Batteries

Amey Nimkar, Netanel Shpigel, Fyodor Malchik, Shaul Bublil, Tianju Fan, Tirupathi Rao Penki, Merav Nadav Tsubery, Doron Aurbach

Research output: Contribution to journal › Article › peer-review

23 Scopus citations

Abstract

A key issue in the development of sustainable Na-ion batteries (NIBs) is the stability of the electrolyte solution and its ability to form effective passivation layers on both cathode and anode. In this regard, the use of fluorine-based additives is considered a promising direction for improving electrode performance. Fluoroethylene carbonate (FEC) andtrans-difluoroethylene carbonate (DFEC) were demonstrated as additives or cosolvents that form effective passivating surface films in Li-ion batteries. Their effect is evaluated for the first time with cathodes in NIBs. By application of systematic electrochemical and postmortem investigations, the role of fluorinated additives in the good performance of Na_0.44MnO₂(NMO) cathodes was deciphered. Despite the significant improvement in the performance of Li-ion cells enabled by the use of FEC and FEC + DFEC, the highest stability for NIBs was observed when only FEC was used as an additive. Mechanistic insights and analytical characterizations were carried out to shed light on the inferior effect of FEC + DFEC in NIBs, in contrast to its positive effect on the stability of Li-ion batteries.

Original language	English
Pages (from-to)	46478-46487
Number of pages	10
Journal	ACS applied materials & interfaces
Volume	13
Issue number	39
DOIs	https://doi.org/10.1021/acsami.1c03844
State	Published - 6 Oct 2021

Bibliographical note

Publisher Copyright:
© 2021 American Chemical Society

Funding

The current work was supported by the Israel Ministry of Energy and the INREP project of the Israel Committee of High Education and Prime Minister Office. The authors thank Albert Mor and Ivan Surzhyk for building the cells. N.S. thanks the Israel Academy of Sciences and Humanities for their valuable support.

Funders	Funder number
Israel Committee of High Education and Prime Minister office
Ministry of Energy, Israel

Keywords

Na-ion electrolytes
Na-ion electrolytes additives
cathode electrolyte interface (CEI)
fluoroethylene carbonate (FEC)
sodium-ion batteries (NIBs)
trans-difluoroethylene carbonate (DFEC)

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title = "Unraveling the Role of Fluorinated Alkyl Carbonate Additives in Improving Cathode Performance in Sodium-Ion Batteries",

abstract = "A key issue in the development of sustainable Na-ion batteries (NIBs) is the stability of the electrolyte solution and its ability to form effective passivation layers on both cathode and anode. In this regard, the use of fluorine-based additives is considered a promising direction for improving electrode performance. Fluoroethylene carbonate (FEC) andtrans-difluoroethylene carbonate (DFEC) were demonstrated as additives or cosolvents that form effective passivating surface films in Li-ion batteries. Their effect is evaluated for the first time with cathodes in NIBs. By application of systematic electrochemical and postmortem investigations, the role of fluorinated additives in the good performance of Na0.44MnO2(NMO) cathodes was deciphered. Despite the significant improvement in the performance of Li-ion cells enabled by the use of FEC and FEC + DFEC, the highest stability for NIBs was observed when only FEC was used as an additive. Mechanistic insights and analytical characterizations were carried out to shed light on the inferior effect of FEC + DFEC in NIBs, in contrast to its positive effect on the stability of Li-ion batteries.",

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Unraveling the Role of Fluorinated Alkyl Carbonate Additives in Improving Cathode Performance in Sodium-Ion Batteries

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Keywords

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