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Dual-Functional Ga/F Co-Doped Argyrodite Sulfide Electrolytes for All-Solid-State Lithium Batteries
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AI
Y
黎
L
Y
祁
范
DOI：10.34133/energymatadv.0227.png)
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Abstract
En 中文
Sulfide solid electrolytes (SEs) are considered a top contender for next-generation energy storage systems due to their high ionic conductivity and relatively “soft” mechanical properties. Nevertheless, interface hydrolysis in air and reduction at the Li/SE interface hinder their practical application in all-solid-state batteries. In this work, a novel chemically stabilized argyrodite-based SE Li5.58P0.96Ga0.04S4.5Cl1.38F0.12 was developed by co-doping Ga, F in Li5.5PS4.5Cl1.5 (LPSC), which has an excellent ionic conductivity of 4.5 mS/cm at 25 °C. Notably, the co-doping strategy promotes the formation of lithium-friendly Li–Ga alloys and electron-insulating LiF at the Li/SE interface, which plays an essential role in regulating the uniform plating/stripping of Li+ and suppressing the interfacial side reactions. The Li symmetric cells exhibit a high critical current density of 1.8 mA/cm2 and stable cycling for 2,000 h at 0.2 mA/cm2. Furthermore, the Ga, F co-doped electrolyte exhibits substantial structural stability at 30% relative humidity, further demonstrated by the density functional theory calculations. When paired with LiNi0.8Co0.1Mn0.1O2 or LiCoO2 cathodes, the all-solid-state lithium metal cells demonstrate outstanding cycle stability and rate performance. Owing to their superior air stability and compatibility with Li metal, Ga/F co-doped LPSCs are poised to become the next generation of all-solid-state lithium batteries.
Keywords:
Sulfide solid electrolytes
All-solid-state batteries
Ga/F co-doping
Lithium metal anode
Interface stability
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15.9
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225
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1.6K
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