Operando Optical Imaging of Cathode Swelling Process Inside Lithium Primary Batteries: Comparative Studies between Different Structured CF x
As a crucial cathode material with ultrahigh theoretical capacity (865 mAh/g) and energy density (>2100 Wh/kg), fluorinated carbon (CF x ) is promising for lithium primary batteries. However, the operating performance of CF x cathode is hindered by nonuniform volume expansion during discharging....
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Veröffentlicht in: | ACS applied materials & interfaces 2024-11, Vol.16 (47), p.64898-64906 |
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Hauptverfasser: | , , , , , , , , , |
Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | As a crucial cathode material with ultrahigh theoretical capacity (865 mAh/g) and energy density (>2100 Wh/kg), fluorinated carbon (CF x ) is promising for lithium primary batteries. However, the operating performance of CF x cathode is hindered by nonuniform volume expansion during discharging. To investigate this, we used operando confocal microscopy to visualize the thickness evolution of two different CF x cathodes and quantified their swelling ratios as a function of the discharge depth. Our findings show that CF x synthesized from hard carbon (FHC), featuring a disordered structure and abundant pores, exhibits a swelling ratio lower than that of conventional layered fluorinated graphite (FG). This is due to different electrochemical mechanisms: lithium enters FG interlayers nonuniformly through “edge propagation” pathways while lithiation occurs homogeneously in FHC, unraveled by single-particle Raman and photoluminescence measurement. This work enhances our understanding on CF x volume expansion, offering important opportunities to address the cathode swelling issue and optimize electrochemical performance in Li/CF x batteries. |
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ISSN: | 1944-8244 1944-8252 |
DOI: | 10.1021/acsami.4c15782 |