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However, instability of SOTA cathodes (i.\u2009e., LiNi<jats:sub><jats:italic>y<\/jats:italic><\/jats:sub>Co<jats:sub><jats:italic>x<\/jats:italic><\/jats:sub>Mn<jats:sub><jats:italic>y<\/jats:italic><\/jats:sub>O<jats:sub>2<\/jats:sub>; <jats:italic>x<\/jats:italic>+<jats:italic>y<\/jats:italic>+<jats:italic>z<\/jats:italic>=1; NCM) triggers electrode crosstalk through enhanced transition metal (TM) dissolution and contributes to severe capacity fade; in the worst case, to a sudden death (\u201croll\u2010over failure\u201d). Lithium difluorophosphate (LiDFP) as electrolyte additive is able to boost high voltage performance by scavenging dissolved TMs. However, LiDFP is chemically unstable and rapidly decomposes to toxic (oligo)organofluorophosphates (OFPs) at elevated temperatures; a process that can be precisely analyzed by means of high\u2010performance liquid chromatography\u2013high resolution mass spectroscopy. The toxicity of LiDFP can be proven by the well\u2010known acetylcholinesterase inhibition test. Interestingly, although fluoroethylene carbonate (FEC) is inappropriate for high voltage applications as a single electrolyte additive due to rollover failure, it is able to suppress formation of toxic OFPs. Based on this, a synergistic LiDFP\/FEC dual\u2010additive approach is suggested in this work, showing characteristic benefits of both individual additives (good capacity retention at high voltage in the presence of LiDFP and decreased OFP formation\/toxicity induced by FEC).<\/jats:p>","DOI":"10.1002\/cssc.202202189","type":"journal-article","created":{"date-parts":[[2022,12,19]],"date-time":"2022-12-19T08:03:55Z","timestamp":1671437035000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":19,"title":["Lithium Difluorophosphate: A Boon for High Voltage Li Ion Batteries and a Bane for High Thermal Stability\/Low Toxicity: Towards Synergistic Dual Additives to Circumvent this Dilemma"],"prefix":"10.1002","volume":"16","author":[{"given":"Maximilian","family":"Kubot","sequence":"first","affiliation":[{"name":"MEET Battery Research Center, I nstitute of Physical Chemistry University of M\u00fcnster  Corrensstra\u00dfe 46 48149 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