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Instruments / Technical Area	Publication Details	Published	Actions
I09-Surface and Interface Structural Analysis	A halogen-free and flame-retardant sodium electrolyte compatible with hard carbon anodes Lars Olow Simon Colbin , Ronnie Mogensen , Alexander Buckel , Yong‐lei Wang , Andrew J. Naylor , Jolla Kullgren , Reza Younesi Advanced Materials Interfaces DOI: 10.1002/admi.202101135 Diamond Proposal Number(s): [26551] Open Access Show Abstract ▼ Abstract: For sodium-ion batteries, two pressing issues concerning electrolytes are flammability and compatibility with hard carbon anode materials. Non-flammable electrolytes that are sufficiently stable against hard carbon have—to the authors’ knowledge—previously only been obtained by either the use of high salt concentrations or additives. Herein, the authors present a simple, fluorine-free, and flame-retardant electrolyte which is compatible with hard carbon: 0.38 m sodium bis(oxalato)borate (NaBOB) in triethyl phosphate (TEP). A variety of techniques are employed to characterize the physical properties of the electrolyte, and to evaluate the electrochemical performance in full-cell sodium-ion batteries. The results reveal that the conductivity is sufficient for battery operation, no significant self-discharge occurs, and a satisfactory passivation is enabled by the electrolyte. In fact, a mean discharge capacity of 107 ± 4 mAh g−1 is achieved at the 1005th cycle, using Prussian white cathodes and hard carbon anodes. Hence, the studied electrolyte is a promising candidate for use in sodium-ion batteries.	Oct 2021

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I09-Surface and Interface Structural Analysis

A halogen-free and flame-retardant sodium electrolyte compatible with hard carbon anodes

Lars Olow Simon Colbin , Ronnie Mogensen , Alexander Buckel , Yong‐lei Wang , Andrew J. Naylor , Jolla Kullgren , Reza Younesi

Advanced Materials Interfaces

DOI: 10.1002/admi.202101135

Diamond Proposal Number(s): [26551]