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Contact Resistance of Carbon–Li x (Ni,Mn,Co)O 2 Interfaces

Kuo, Jimmy Jiahong ; Kang, Stephen Dongmin ; Chueh, William C.

Advanced energy materials, 2022-08, Vol.12 (31) [Periódico revisado por pares]

Germany: Wiley Blackwell (John Wiley & Sons)

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  • Título:
    Contact Resistance of Carbon–Li x (Ni,Mn,Co)O 2 Interfaces
  • Autor: Kuo, Jimmy Jiahong ; Kang, Stephen Dongmin ; Chueh, William C.
  • É parte de: Advanced energy materials, 2022-08, Vol.12 (31)
  • Notas: USDOE
  • Descrição: Abstract Electronic resistance in lithium‐ion battery positive electrodes is typically attributed to the bulk resistance of the active material and the network resistance of the carbon additive. Expected overpotentials from these bulk components are minimal relative to that from charge‐transfer resistance. However, literature reports show that cell overpotentials are often much more sensitive to conductive additives than the expected level from bulk or percolating‐network transport. This discrepancy motivated a detailed examination of the contact resistance between the active material and conductive additive. The contact and bulk resistances are simultaneously measured using dense bar samples of lithium‐layered oxides (Li x Ni 1 /3 Mn 1/3 Co 1/3 O 2 and Li x Ni 0.5 Mn 0.3 Co 0.2 O 2 ) in contact with carbon black. It is found that the contact resistance dominates the overall electronic resistance when the length scale is smaller than millimeters; after correcting for contact effects, bulk conductivity of layered oxides is determined to be orders‐of‐magnitude higher than previously reported. In porous electrodes, it is found from three‐electrode electrochemical impedance spectroscopy that the carbon content most heavily influences the low‐frequency regime (≈0.01 Hz), as opposed to the high frequency (>10 3  Hz) regime expected from electronic percolating properties. Constriction effects within the layered oxide are identified as the dominant mechanism for contact resistance and its implication is investigated for porous electrodes.
  • Editor: Germany: Wiley Blackwell (John Wiley & Sons)
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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