Enhancement of Li+ transport through intermediate phase in high-content inorganic composite quasi-solid-state electrolytes
Peer-Reviewed Publication
Updates every hour. Last Updated: 12-Nov-2025 16:11 ET (12-Nov-2025 21:11 GMT/UTC)
Quasi-solid-state electrolytes, which integrate the safety characteristics of inorganic materials, the flexibility of polymers, and the high ionic conductivity of liquid electrolytes, represent a transitional solution for high-energy-density lithium batteries. However, the mechanisms by which inorganic fillers enhance multiphase interfacial conduction remain inadequately understood. In this work, we synthesized composite quasi-solid-state electrolytes with high inorganic content to investigate interfacial phenomena and achieve enhanced electrode interface stability. Li1.3Al0.3Ti1.7(PO4)3 particles, through surface anion anchoring, improve Li+ transference numbers and facilitate partial dissociation of solvated Li+ structures, resulting in superior ion transport kinetics that achieve an ionic conductivity of 0.51 mS cm−1 at room temperature. The high mass fraction of inorganic components additionally promotes the formation of more stable interfacial layers, enabling lithium-symmetric cells to operate without short-circuiting for 6000 h at 0.1 mA cm−2. Furthermore, this system demonstrates exceptional stability in 5 V-class lithium metal full cells, maintaining 80.5% capacity retention over 200 cycles at 0.5C. These findings guide the role of inorganic interfaces in composite electrolytes and demonstrate their potential for advancing high-voltage lithium battery technology.
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