NaSICON Solid-State Electrolyte Molar Ratio Optimization
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Solution Overview
Problem
Current all-solid-state batteries have limitations in ionic conductivity, which affects their battery characteristics and performance.
Innovation Solution
A NaSICON-type solid-state electrolyte composed of Na, Zr, M, Si, P, and O, with a specific molar ratio of M to Zr less than 0.2, and optionally including Y, to enhance ionic conductivity and improve battery characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional solid-state electrolytes are used, then the battery structure is simple, but the ionic conductivity is insufficient
Solution Approach 1:
The patent applies parameter changes by precisely controlling the molar ratio of M to Zr (M/Zr < 0.2) and the content of Y (0 < y ≤ 0.12) in the solid-state electrolyte composition. This optimization of compositional parameters achieves high ionic conductivity (≥10^-4 S/cm at 25°C) while maintaining structural stability, resolving the contradiction between improving ionic conductivity and managing composition complexity.
Solution Approach 2:
The patent employs composite materials by creating a multi-element solid-state electrolyte system containing Na, Zr, M (Mg, V, or Nb), Si, P, and O. This composite approach combines multiple elements with complementary properties to achieve both high ionic conductivity and structural stability, overcoming the limitations of simpler conventional electrolyte compositions.
2Reliability
If the M/Zr ratio is increased to improve ionic conductivity, then ionic conductivity improves, but structural stability deteriorates
Solution Approach 1:
The patent resolves this contradiction through precise parameter control by establishing the condition M/Zr < 0.2. This parameter optimization ensures that the solid-state electrolyte achieves sufficient ionic conductivity (≥10^-4 S/cm at 25°C) while maintaining structural stability, preventing the degradation that would occur at higher M/Zr ratios.
Solution Approach 2:
The patent applies local quality by introducing Y at specific locations within the crystal structure (0 < y ≤ 0.12). This localized doping strategy enhances ionic conductivity in critical regions while preserving the overall structural stability of the NaSICON framework, allowing the system to achieve high performance without compromising stability.
3Reliability
If the solid-state electrolyte composition is optimized for high ionic conductivity, then battery characteristics improve, but manufacturing complexity increases
Solution Approach 1:
The patent applies parameter changes by defining specific compositional ranges (M/Zr < 0.2, 0 < y ≤ 0.12) that optimize battery characteristics. These well-defined parameters provide clear manufacturing targets, making it easier to control production quality and consistency while achieving high ionic conductivity and excellent battery performance.
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 proposed solid-state electrolyte configuration significantly increases ionic conductivity, leading to improved battery characteristics such as enhanced power density in all-solid-state batteries.
Implementation Method 1
a solid-state electrolyte having high ionic conductivity
Data Source
AI summary
A NaSICON-type solid-state electrolyte that contains Na as a conducting species, Zr, M, Si, P, and O, where M is at least one element selected from Mg, V, and Nb. The NaSICON-type solid-state electrolyte has a composition in which a molar ratio of M to Zr (M/Zr) is less than 0.2.