Jointing of Cathode Coating and Interface Modification for Stabilizing Poly(ethylene oxide) Electrolytes Against High-voltage Cathodes
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Abstract
Poly(ethylene oxide) (PEO)-based solid electrolytes are deemed as the most promising alternatives for solidstate lithium batteries on account of their low cost, good stability against Li metal, and easy large-scale production.However, the instability of PEO against high-voltage cathodes severely limits its application in the fields needing high energy density.In this work, a discontinuous cyclized polyacrylonitrile (cPAN) nanolayer served as an electronconducting shell is partially coated on LiNi0.6Co0.2Mn0.2O2(NCM) cathode particles, while an ionic liquid acted as ionconducting pathway is introduced at NCM/PEO interface, enabling the high compatibility of PEO against high-voltage NCM cathode.The cPAN layer not only physically isolates the direct contact of PEO electrolyte from NCM cathode, but also contributes to the electronic transfer inside the cathode due to the formation of delocalized sp 2 π bond during coating process.Meanwhile, the mobile ionic liquid with good ionic conductivity fully wets cathodic interface, followed by the decomposition into cathode-electrolyte interphase (CEI) of LiF and Li3N, further restricting the oxidation-failure of PEO electrolyte.By taking the combined strategy, the corresponding solid-state NCM/Li battery delivers an excellent electrochemical performance with a capacity retention of 85.3% after 100 cycles at 0.1C (1C=0.18A‧ g -1 ) under a cutoff voltage of 4.3V.This work opens up a new direction to address the interfacial stability issues of PEO-based electrolyte against high-voltage cathodes through surface coating and interface modification.
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OpenAlex topics: Anodic Oxide Films and Nanostructures · Polymer Science and PVC · Corrosion Behavior and Inhibition
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References (40)
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