Impact of electrolyte decomposition products on the electrochemical performance of 4 V class K-ion batteries.

ABSTRACT: In the pursuit of long-life K-ion batteries (KIBs), half-cell measurements using highly reactive K metal counter electrodes are a standard practice. However, there is increasing evidence of electrolyte decomposition by K metal impacting electrode performance. Herein, we systematically explored the K metal-treated electrolytes KPF₆, KN(SO₂F)₂ (KFSA), and their combination in ethylene carbonate/diethyl carbonate (EC/DEC), referred to as K-KPF₆, K-KFSA, and K-KPF₆:KFSA, respectively, after storage in contact with K metal. Through mass spectrometry analysis, we identified significant formation of carbonate ester-derived decomposition products such as oligocarbonates for K-KPF₆, while K-KFSA predominantly generates anions combini

SUBMITTER: Hosaka T 

PROVIDER: S-EPMC10445460 | biostudies-literature | 2023 Aug

REPOSITORIES: biostudies-literature