Oxide-Based Solid Electrolyte Cubic Phase Preparation
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Solution Overview
Problem
Lithium batteries require high ionic conductivity and low electrical conductivity electrolytes to meet increasing power demands, but existing organic liquid electrolytes are flammable and volatile, while inorganic solid electrolytes face challenges in achieving pure cubic phases for optimal performance.
Innovation Solution
A method for preparing oxide-based solid electrolytes by mixing lithium, lanthanum, and metal compounds with specific dopants, followed by heat treatment, to form LixLa3M2O12 crystals with a cubic phase, enhancing ionic conductivity and purity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If organic liquid electrolyte is used, then high ionic conductivity is achieved, but flammability and volatility occur
Solution Approach 1:
The patent changes the physical state of the electrolyte from liquid to solid by using oxide-based materials with specific crystal structures (cubic phase LixLa3M2O12), thereby maintaining high ionic conductivity while eliminating flammability and volatility associated with organic liquid electrolytes
Solution Approach 2:
The patent employs composite doping strategies by incorporating multiple dopants (first dopant from group 13-15 elements and second dopant from group 5 elements) into the oxide-based solid electrolyte structure to simultaneously optimize ionic conductivity and structural stability
2Reliability
If inorganic solid electrolyte is used, then safety and stability are improved, but achieving pure cubic phase is difficult
Solution Approach 1:
The patent precisely controls the composition parameters (molar ratios of Li, La, M, first dopant, and second dopant) and heat treatment parameters (temperature range 900-1100°C, time 2-4 hours) to achieve complete transformation to pure cubic phase structure, eliminating phase impurity issues
Solution Approach 2:
The patent introduces dopant precursors as intermediary substances during the synthesis process that facilitate the formation of pure cubic phase by modifying the crystallization behavior and suppressing competing phase formations during heat treatment
3Power
If high power is required, then ionic conductivity must be increased, but electrical conductivity also increases
Solution Approach 1:
The patent optimizes the lithium content parameter (x in LixLa3M2O12 where x=5 or 7) and dopant concentrations to achieve maximum ionic conductivity while maintaining low electronic conductivity, enabling high power output with proper conductivity control
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 approach results in oxide-based solid electrolytes with high ionic conductivity and purity, overcoming the limitations of existing electrolytes by forming pure cubic phases and improving lithium battery performance.
Implementation Method 1
crystallizing the intermediate to prepare LixLa3M2O12 crystals having a cubic phase
Implementation Method 2
the crystallizing of the intermediate may include heat treating the intermediate in a temperature range of 800° C. to 1,000° C. for 3 hours to 4 hours
Data Source
AI summary
An oxide-based solid electrolyte according to the present invention may be LixLa3M2O12 and may have a cubic phase. The oxide-based solid electrolyte may further include first and second dopants. A method of preparing an oxide-based solid electrolyte according to the concept of the present invention may include mixing a lithium compound, a lanthanum compound, a metal compound, a first dopant precursor, and a second dopant precursor to prepare an intermediate, and crystallizing the intermediate to prepare LixLa3M2O12 crystals having a cubic phase.