Modification of Electrolyte/Cathode Interfaces by Solid-State Electrolyte Thin Films

Kuo‐Feng Chiu

doi:10.1149/1.3655688

Modification of Electrolyte/Cathode Interfaces by Solid-State Electrolyte Thin Films

2011-10-11

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DOI：10.1149/1.3655688

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In this study, the bilayers of the lithium phosphorus oxynitride (LiPON) film on LiCoO2 cathode have been deposited using radio frequency (RF) magnetron sputtering with in-situ substrate bias, followed by post-anneal. For the purpose of decreasing charge transfer resistances, the solid-state interfaces between the LiPON solid-state electrolyte and the LiCoO2 cathode have been modified. By controlling different in-situ substrate bias voltages and anneal times, the properties of both LiPON electrolyte thin films and LiPON/LiCoO2 interface have been altered, as characterized by scanning electron microscopy, X-ray diffraction, impedance spectroscopy, and electron spectroscopy for chemical analysis. It is found that the electrolyte/cathode interfaces are modified in terms of contact structures and interface resistances. After anneal of 30 min. at 200 degrees C in nitrogen environment, the seams and voids at the interface are eliminated. The charge transfer resistance at the interface has been greatly reduced. As a result, one order of magnitude reduction in both interfacial resistance and total cell resistance has been achieved.

Keyword:

LITHIUM PHOSPHORUS OXYNITRIDE

ION BATTERIES

THERMAL-STABILITY

LICOO2

PERFORMANCE

CATHODES

Modification of Electrolyte/Cathode Interfaces by Solid-State Electrolyte Thin Films

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