Li-Ca-Ce-O Solid Electrolytes for Stable High-Conductivity Batteries
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current solid-state lithium-ion conductors, particularly oxide materials, face challenges such as low ionic conductivity, limited electrochemical stability, and high production costs, hindering the widespread adoption of solid-state batteries.
Innovation Solution
Development of novel lithium-containing oxides within the Li--Ca--Ce--O chemical space, utilizing machine learning-based crystal structure prediction, to create high-conductivity, cost-effective, and aqueous-stable solid electrolytes for 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 deteriorates (H2S release in air) and electrochemical stability is limited (unstable against Li metal)
Solution Approach 1:
The patent segments the solid-state electrolyte material into specific oxide compositions with defined stoichiometric ratios (Li2-x-yM1yM21-yO3, Li2-x-yM1yM21-yO2.5, Li2-x-yM1yM21-yO3-δ) where M1 and M2 are different metal elements. This segmentation allows optimization of ionic conductivity through controlled substitution while maintaining safety and stability properties that sulfide materials lack.
Solution Approach 2:
The patent applies parameter changes by systematically varying the stoichiometric parameters (x, y, δ) and metal element compositions in the oxide electrolyte formulas. This enables tuning of ionic conductivity, electrochemical stability, and safety characteristics independently, resolving the contradiction between high conductivity and stability that plagues sulfide materials.
2Object-affected harmful factors
If oxide solid-state electrolytes are used, then electrochemical stability is improved, but ionic conductivity deteriorates (lower than sulfide SSLICs)
Solution Approach 1:
The patent employs composite materials by creating mixed-metal oxide electrolytes with formulas Li2-x-yM1yM21-yO3, Li2-x-yM1yM21-yO2.5, and Li2-x-yM1yM21-yO3-δ where M1 and M2 represent different metal elements. This composite approach combines the electrochemical stability of oxides with enhanced ionic conductivity through synergistic metal element interactions, overcoming the conductivity limitation of conventional oxide electrolytes.
Solution Approach 2:
The patent applies local quality by introducing specific metal element substitutions at controlled positions within the oxide crystal structure. The parameters x, y, and δ locally modify the oxygen deficiency and metal distribution, creating regions with optimized ionic transport pathways while maintaining the overall electrochemical stability of the oxide framework.
3Reliability
If conventional solid-state electrolyte materials are developed, then ionic conductivity can be improved, but production cost and complexity increase
Solution Approach 1:
The patent applies universality by developing a family of oxide electrolyte compositions (Li2-x-yM1yM21-yO3, Li2-x-yM1yM21-yO2.5, Li2-x-yM1yM21-yO3-δ) that can serve multiple functions: achieving high ionic conductivity, ensuring electrochemical stability, and maintaining compatibility with standard solid-state battery manufacturing processes. This multi-functional design reduces development costs for different battery configurations.
Data Source
AI summary
A lithium-containing oxide has one of the following parent compositions: Li2-zCaCeO4, Li2-zCa2Ce2O7, or Li2-zCaCe2O6, where z ranges from −1 to 1. 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.