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Beneficial impact of lithium bis(oxalato)borate as electrolyte additive for high‐voltage nickel‐rich lithium‐battery cathodes

Wu, Fanglin 1; Mullaliu, Angelo 1; Diemant, Thomas 1; Stepien, Dominik 1; Parac-Vogt, Tatjana N.; Kim, Jae-Kwang; Bresser, Dominic 1; Kim, Guk-Tae 1; Passerini, Stefano 2
1 Karlsruher Institut für Technologie (KIT)
2 Helmholtz-Institut Ulm (HIU), Karlsruher Institut für Technologie (KIT)


High-voltage nickel-rich layered cathodes possess the requisite, such as excellent discharge capacity and high energy density, to realize lithium batteries with higher energy density. However, such materials suffer from structural and interfacial instability at high voltages (>4.3 V). To reinforce the stability of these cathode materials at elevated voltages, lithium borate salts are investigated as electrolyte additives to generate a superior cathode-electrolyte interphase. Specifically, the use of lithium bis(oxalato)borate (LiBOB) leads to an enhanced cycling stability with a capacity retention of 81.7%. Importantly, almost no voltage hysteresis is detected after 200 cycles at 1C. This outstanding electrochemical performance is attributed to an enhanced structural and interfacial stability, which is attained by suppressing the generation of micro-cracks and the superficial structural degradation upon cycling. The improved stability stems from the formation of a fortified borate-containing interphase which protects the highly reactive cathode from parasitic reactions with the electrolyte. Finally, the decomposition process of LiBOB and the possible adsorption routes to the cathode surface are deduced and elucidated.

Verlagsausgabe §
DOI: 10.5445/IR/1000160111
Veröffentlicht am 04.07.2023
DOI: 10.1002/inf2.12462
Zitationen: 7
Web of Science
Zitationen: 2
Zitationen: 8
Cover der Publikation
Zugehörige Institution(en) am KIT Helmholtz-Institut Ulm (HIU)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2023
Sprache Englisch
Identifikator ISSN: 2567-3165
KITopen-ID: 1000160111
HGF-Programm 38.02.01 (POF IV, LK 01) Fundamentals and Materials
Erschienen in InfoMat
Verlag Wiley Open Access
Band 5
Heft 8
Seiten Art.-Nr.: e12462
Bemerkung zur Veröffentlichung Gefördert durch den KIT-Publikationsfonds
Vorab online veröffentlicht am 28.06.2023
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