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Article Abstract
Garnet-type solid electrolytes (SEs) exhibit high ionic conductivity, a wide electrochemical window, and lithium stability, making them ideal for solid-state Li metal batteries. However, their air sensitivity leads to LiCO formation, causing poor Li wettability, high interfacial resistance, and dendrite growth. To address this, Mg(PO) is coated via a wet chemistry method, converting LiCO into a LiPO/MgO composite upon heating. This composite prevents reactions with moisture and CO, ensuring air stability while enhancing Li wettability and reducing interfacial resistance. The Li-conducting LiPO and insulating MgO in the composite interface enable rapid Li diffusion while effectively suppressing electron penetration, resulting in a high critical current density of 1.1 mA·cm, with stable cycling for over 1200 h at 0.4 mA·cm. Furthermore, the modified SEs demonstrate excellent cycling stability in Li metal batteries with LiFePO and LiCoO cathodes, confirming the practical feasibility of this solid electrolyte interface modification strategy.
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