Cubic Garnet Lithium Oxide Electrolyte for Higher Ion Conductivity
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Solution Overview
Problem
Conventional solid electrolytes have room for improvement in ion conductivity.
Innovation Solution
A lithium-containing oxide with a cubic garnet structure, characterized by specific NMR peak patterns and atomic ratios, is prepared through a topotactic reaction at controlled temperatures, introducing anions such as fluorine to enhance ion conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional solid electrolytes are used, then the battery structure is established, but ion conductivity is insufficient
Solution Approach 1:
The patent applies parameter changes by precisely controlling the sintering temperature (900-1100°C) and time (5-24 hours) to achieve optimal ion conductivity. The chemical composition parameters are also optimized with specific atomic ratios (Li:La:Zr = 6-12:3:1-3) and doping concentrations (0.01-5 mol%) to maximize lithium ion conductivity while maintaining structural stability
Solution Approach 2:
The patent employs composite materials by doping LLZO with multiple elements including aluminum (0.1-5 mol%), gallium (0.1-5 mol%), and fluorine (0.01-5 mol%). This creates a composite structure that combines the high conductivity of LLZO with the stabilizing and conductivity-enhancing effects of dopants, achieving both high ion conductivity and structural stability
2Object-affected harmful factors
If solid electrolyte is used instead of electrolytic solution, then safety is improved, but ion conductivity needs enhancement
Solution Approach 1:
The patent changes the chemical composition parameters by incorporating fluorine doping (0.01-5 mol%) and aluminum/gallium doping (0.1-5 mol%) into the LLZO structure. These compositional changes create pathways for enhanced lithium ion conduction while preserving the solid electrolyte's inherent safety advantages of being flame-retardant and solvent-free
Solution Approach 2:
The patent applies local quality by creating specific doped regions within the LLZO crystal structure where aluminum, gallium, and fluorine atoms are incorporated at specific sites. This local modification of the crystal lattice creates preferential pathways for lithium ion transport while maintaining the overall structural integrity and safety of the solid electrolyte
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 lithium-containing oxide exhibits excellent lithium ion conductivity, suitable for use in solid electrolytes, particularly in lithium ion batteries, enabling rapid charging and discharging without the need for solvents and allowing the use of electrodes with higher potentials.
Implementation Method 1
A method for preparing a solid electrolyte includes a step of performing a topotactic reaction on a lithium-containing oxide
Implementation Method 2
lithium-containing oxides such as Li7La3Zr2O12 (LLZO) have received particular attention because they are useful as solid electrolyte layers in lithium ion batteries
Data Source
AI summary
A lithium-containing oxide having a cubic garnet structure and wherein, when a solid-state 19F-NMR spectrum is measured under conditions where a 19F nucleus resonance frequency is 564 MHz, at least one peak is observed within a chemical shift range of −100 to 50 ppm, based on a chemical shift of polytetrafluoroethylene being −122 ppm.