Solid-State Electrolyte for Lithium Metal Battery Stability

The patent employs composite materials by combining multiple elements (Li, P, S, Si, Ge, Al, Ga, In, Ti, Zr, Hf, Ca, Sr, Ba, Mg, Na, K, Rb, Cs, F, Cl, Br, I) in specific ratios within the formula Li6+(5−a)x−b*y−z(c+2)wA1−x(M1)ax(M2)byO5−z−wX1+zQcw to create a solid-state electrolyte that simultaneously achieves high ionic conductivity and stability with lithium metal. This composite approach allows optimization of both contradictory properties through material composition design.

The patent applies parameter changes by systematically varying the stoichiometric ratios of elements in the electrolyte formula, controlled by parameters x, y, z, w, a, and b, to optimize both ionic conductivity and stability. By adjusting these compositional parameters within specific ranges, the electrolyte achieves the dual performance of high lithium ion conductivity and chemical stability with lithium metal.

The patent uses the developed solid-state electrolyte as an intermediary layer between the lithium metal negative electrode and the rest of the battery system. This intermediary electrolyte layer prevents direct mechanical stress concentration and dendrite propagation while maintaining ionic transport, thereby preserving the high energy density benefits of lithium metal while mitigating mechanical integrity problems.

The patent employs composite materials in the electrolyte formulation that provide both mechanical strength and ionic conductivity, creating a robust interface with lithium metal that prevents dendrite formation while maintaining the high capacity benefits of lithium metal anodes.