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Lithium halide electrolytes show great potential in constructing high-energy-density solid-state batteries with high-voltage cathode materials due to their high electrochemical stability and wide voltage windows. However, the high cost and low conductivity of some compositions inhibit their applications. Moreover, the effect of electronic additives in the cathode mixture on the stability and capacity is unclear. Here, the Y3+ doping strategy is applied to enhance the conductivity of low-cost Li2ZrCl6 electrolytes. By tailoring the Y3+ dopant in the structure, the optimal Li2.5Zr0.5Y0.5Cl6 with high conductivity up to 1.19 × 10−3 S cm−1 is obtained. Li2.5Zr0.5Y0.5Cl6@CNT/Li2.5Zr0.5Y0.5Cl6/Li5.5PS4.5Cl1.5/In-Li solid-state batteries with different carbon nanotube (CNT) contents in the cathode are fabricated. The stability and electrochemical performances of the cathode mixture as a function of CNT content are studied. The cathode mixture containing 2% (wt.) CNT exhibits the highest stability and almost no discharge capacity, while the cathode mixture consisting of Li2.5Zr0.5Y0.5Cl6 and 10% (wt.) CNT delivers a high initial discharge capacity of 199.0 mAh g−1 and reversible capacities in the following 100 cycles. Multiple characterizations are combined to unravel the working mechanism and confirm that the electrochemical reaction involves the 2-step reaction of Y3+/Y0, Zr4+/Zr0, and Cl−/Clx− in the Li2.5Zr0.5Y0.5Cl6 electrolyte. This work provides insight into designing a lithium halide electrolyte-based cathode mixture with a high ionic/electronic conductive framework and good interfacial stability for solid-state batteries.
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