Li2ZrSiO5 Solid Electrolyte Composition for Conductivity and Stability
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Solution Overview
Problem
Current solid-state lithium-ion conductors, particularly oxide materials, face challenges such as low ionic conductivity and limited electrochemical stability, hindering the widespread adoption of solid-state batteries, while sulfide-based materials offer high conductivity but are unsafe and unstable.
Innovation Solution
Development of novel lithium-containing oxides, specifically Li2ZrSiO5, crystallized in various space groups, which exhibit high ionic conductivity and improved electrochemical stability, suitable for use as solid electrolytes and electrode coatings in solid-state batteries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sulfide-based solid-state electrolytes are used, then ionic conductivity is improved (>10 mS/cm), but safety and electrochemical stability deteriorate (H2S release, unstable against Li metal)
Solution Approach 1:
The patent employs composite materials by combining lithium oxide (Li2O) with zirconium silicate (ZrSiO3) to form a new composite solid electrolyte material Li2ZrSiO5. This composite approach allows the material to achieve high ionic conductivity comparable to sulfide-based electrolytes while simultaneously providing the safety and electrochemical stability characteristics of oxide materials, thus resolving the contradiction between conductivity and stability.
2Object-affected harmful factors
If oxide solid-state electrolytes are used, then electrochemical and chemical stability is improved, but ionic conductivity deteriorates (generally lower than sulfide SSLICs)
Solution Approach 1:
The patent applies parameter changes by systematically varying the chemical composition within the Li-Zr-Si-O system, specifically optimizing the ratios of Li2O, ZrO2, and SiO2 components. By adjusting these compositional parameters and controlling crystallization conditions, the material achieves a unique balance where oxide-based electrochemical stability is maintained while ionic conductivity is enhanced to levels comparable with or exceeding traditional sulfide-based electrolytes.
3Adaptability or versatility
If lithium garnet is used as oxide-type electrolyte, then oxide material availability is improved, but ionic conductivity remains limited compared to sulfide SSLICs
Solution Approach 1:
The patent segments the traditional lithium garnet structure by introducing ZrSiO3 units into the Li2O matrix, creating a new structural motif Li2ZrSiO5. This segmentation allows the material to inherit the advantages of oxide materials (stability, availability) while the modified structure provides enhanced ionic conduction pathways, overcoming the conductivity limitations of conventional lithium garnet electrolytes.
Data Source
AI summary
A lithium-containing oxide has the parent composition Li2ZrSiO5 and includes Li2ZrSiO5 which is crystallized in space group Pc, Cc, Pmn21, P21, Pna21, P212121, P43, Pca21, P21/c, Pbca, C2/c, Pmc21, or P4/nmm. A lithium solid-state battery includes an anode, a cathode, and a solid electrolyte, wherein the solid electrolyte includes the aforementioned lithium-containing oxide. Also, a solid-state battery includes an anode, a cathode, and a solid electrolyte, wherein at least one of the anode and the cathode is coated with a coating which includes the aforementioned lithium-containing oxide.