LLZO Solid-State Electrolyte Membrane Air Degradation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional solid-state LLZO electrolyte membranes for lithium-ion batteries degrade rapidly when exposed to air, limiting their performance and requiring hermetic packaging, which increases production costs and restricts assembly under controlled conditions.
Innovation Solution
A fused solid-state electrolyte membrane with a thickness of less than 5 mm, composed of a polycrystalline product with less than 3% amorphous phase and predominantly made of Li, La, Zr, and a dopant, is developed, featuring a microstructure with a high percentage of cubic and tetragonal LLZO phases and a specific composition that enhances resistance to air degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hermetic packaging under argon is used to store the membrane, then the membrane degradation is prevented, but production costs increase
Solution Approach 1:
The patent develops a fused LLZO membrane with specific composition (2.500≤a≤8.500, 1.000≤b≤3.500, 0.600≤c≤2.000, 0≤d≤1.900 in formula LiaLabZrcMdO12) that achieves adequate air stability without requiring expensive hermetic packaging, effectively replacing the need for costly protective packaging with an inherently more stable material composition
Solution Approach 2:
The patent modifies the chemical composition parameters of the LLZO membrane by controlling the atomic indices (a, b, c, d) in the formula LiaLabZrcMdO12 and using specific dopants (Al, P, Sb, Sc, Ti, V, Y, Nb, Hf, Ta, lanthanides, Se, W, Bi, Si, Ge, Ga, Sn, Cr, Fe, Zn, Na, K, Rb, Cs, Fr, Mg, Ca, Sr, Ba), which changes the material's properties to achieve both air stability and high ionic conductivity without requiring hermetic packaging
2Reliability
If hermetic packaging under argon is used to store the membrane, then the membrane degradation is prevented, but assembly under air becomes restricted
Solution Approach 1:
The patent develops a fused LLZO membrane with specific composition (2.500≤a≤8.500, 1.000≤b≤3.500, 0.600≤c≤2.000, 0≤d≤1.900 in formula LiaLabZrcMdO12) that achieves adequate air stability without requiring hermetic packaging, enabling flexible assembly under air conditions
Solution Approach 2:
The patent modifies the chemical composition parameters of the LLZO membrane by controlling the atomic indices (a, b, c, d) in the formula LiaLabZrcMdO12 and using specific dopants, which changes the material's properties to allow assembly under air while maintaining stability
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The fused membrane exhibits significantly improved resistance to aging in air, allowing for storage and assembly in air, reducing production costs and maintaining high ionic conductivity, thus enabling more flexible and cost-effective battery manufacturing and use.
Implementation Method 1
c) cooling until said liquid mass has completely solidified
Data Source
AI summary
A fused solid-state electrolyte e membrane having a thickness less than 5 mm and intended for a lithium-ion battery. The membrane includes a polycrystalline product including at least 3.0% amorphous phase and including, for more than 95% of its mass, of the elements Li, La, Zr, M and O, M being a dopant chosen from the group formed by Al, P, Sb, Sc, Ti, V, Y, Nb, Hf, Ta, the lanthanides with the exception of La, Se, W, Bi, Si, Ge, Ga, Sn, Cr, Fe, Zn, Na, K, Rb, Cs, Fr, Mg, Ca, Sr, Ba and the mixtures thereof. The contents of these elements, measured after a decarbonatation operation without loss of lithium, being defined by the formula LiaLabZrcMdO12, wherein the atomic indices are such that: 2.500<a<8,500, and 1,000<b<3.500, and 0.600<c<2.000, and 0<d<2.000.