Non-Electroconductive Polymer Coating on Graphite Mitigating Electrochemical Degradation of PTFE for a Dry-Processed Lithium-Ion Battery Anode

• DOI: 10.1021/acsami.3c18862
• Publication Date: 2024-02-08T04:35:38Z
• Authors: Taegeun Lee; Jiwoo An; Woo Jun Chung; Hyuntae Kim; Yongil Cho; Hannah Song; Hyeonha Lee; Jong Hun Kang; Jang Wook Choi
• Keywords: Polytetrafluoroethylene; Degradation

Polytetrafluoroethylene (PTFE)-based dry process for lithium-ion batteries is gaining attention as a battery manufacturing scheme can be simplified with drastically reducing environmental damage. However, the electrochemical instability of PTFE in environment has hampered realization high-performance dry-processed anode. In this study, we present non-electroconductive and highly ionic-conductive polymer coating on graphite to mitigate degradation binder minimize resistance. Poly(ethylene oxide) (PEO) poly(vinylidene fluoride–trifluoroethylene–chlorofluoroethylene) (P(VDF–TrFE–CFE)) coatings anode material effectively inhibit electron transfer from PTFE, thereby alleviating breakdown. The improved initial Coulombic efficiencies full cells 67.2% (bare) 79.1% 77.8% increased discharge capacity 157.7 mAh g(NCM)–1 185.1 182.5 cells. These outcomes demonstrate that surmounted by adjusting PTFE.