Journal
ENERGY & ENVIRONMENTAL MATERIALS
Volume 6, Issue 1, Pages -Publisher
WILEY
DOI: 10.1002/eem2.12272
Keywords
composite polymer electrolytes; Gd-doped CeO2 nanowires; Li-ion conduction; oxygen vacancies; surface interaction
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Researchers improved the performance of solid-state Li-metal batteries by introducing Gd-doped CeO2 nanowires to the polymer electrolyte. The optimized composite polymer electrolyte has high ion conductivity and transference number, and exhibits good compatibility with the metallic lithium anode and high-voltage cathode.
Low-cost and flexible solid polymer electrolytes are promising in all-solid-state Li-metal batteries with high energy density and safety. However, both the low room-temperature ionic conductivities and the small Li+ transference number of these electrolytes significantly increase the internal resistance and overpotential of the battery. Here, we introduce Gd-doped CeO2 nanowires with large surface area and rich surface oxygen vacancies to the polymer electrolyte to increase the interaction between Gd-doped CeO2 nanowires and polymer electrolytes, which promotes the Li-salt dissociation and increases the concentration of mobile Li ions in the composite polymer electrolytes. The optimized composite polymer electrolyte has a high Li-ion conductivity of 5 x 10(-4) S cm(-1) at 30 degrees C and a large Li+ transference number of 0.47. Moreover, the composite polymer electrolytes have excellent compatibility with the metallic lithium anode and high-voltage LiNi0.8Mn0.1Co0.1O2 (NMC) cathode, providing the stable cycling of all-solid-state batteries at high current densities.
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