Low-Modulus Solid Electrolyte for High-Conductivity Batteries
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Solution Overview
Problem
Existing solid electrolyte materials for batteries face challenges in achieving high ion conductivity and low resistance, particularly in maintaining effective ion conductivity across varying temperatures and electrode structures.
Innovation Solution
A solid electrolyte material comprising Li, M, and X, where M is selected from Nb, Ta, and Zr, and X is F, Cl, Br, or I, with a Young's modulus of less than 23 GPa, enhancing ion conductivity and electrode structure factor through controlled synthesis methods like mechanochemical milling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If solid electrolyte materials are used in batteries, then ion conductivity is improved, but electrode structure factor and effective ion conductivity are reduced due to material rigidity
Solution Approach 1:
The patent changes the physical parameter of Young's modulus from high (rigid) to low (less than 23 GPa) to resolve the contradiction. By controlling the Young's modulus to be less than 23 GPa, the material becomes sufficiently flexible to conform to electrode structures while maintaining high ion conductivity, thereby improving the electrode structure factor and effective ion conductivity.
Solution Approach 2:
The patent employs composite material design by combining specific elements (Li, M where M is Nb/Ta/Zr, A where A is O/S, and X where X is F/Cl/Br/I) to create a solid electrolyte material with optimized properties. This composite approach allows simultaneous achievement of high ion conductivity and appropriate mechanical flexibility.
2Reliability
If solid electrolyte materials with high ion conductivity are developed, then battery performance is improved, but manufacturing precision and material composition control become more difficult
Solution Approach 1:
The patent establishes specific parameter ranges for composition (molar ratios of Li to M from 0.5 to 3.0, A to X from 0.1 to 2.0) and physical properties (Young's modulus less than 23 GPa) to balance ion conductivity with manufacturability. These defined parameters provide clear manufacturing targets while ensuring high ion conductivity.
3Productivity
If the Young's modulus of solid electrolyte material is reduced to improve flexibility, then electrode structure factor is improved, but material strength may be compromised
Solution Approach 1:
The patent optimizes the Young's modulus to a specific range (less than 23 GPa) that balances flexibility and strength. This parameter control ensures the material is flexible enough to conform to electrode structures for high electrode structure factor while maintaining sufficient mechanical strength for practical application.
Solution Approach 2:
The patent uses composite material design with specific element combinations (Li-M-A-X) to achieve the optimal balance between mechanical strength and flexibility. The synergistic effect of these elements provides both the required mechanical properties and high ion conductivity.
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 material improves the effective ion conductivity and reduces battery resistance, maintaining high lithium ion conductivity across an operating temperature range of -30°C to 80°C, and enhances charge and discharge efficiency.
Implementation Method 1
the ion conductivity of a material itself as the ion conductivity of the electrode
Implementation Method 2
controlled synthesis methods like mechanochemical milling
Data Source
AI summary
A solid electrolyte material of the present disclosure includes Li, M, A, and X. M is at least one selected from the group consisting of Nb, Ta, and Zr. A is at least one selected from the group consisting of O and S. X is at least one selected from the group consisting of F, Cl, Br, and I. The solid electrolyte material of the present disclosure has a Young's modulus of less than 23 GPa. A battery of the present disclosure includes a positive electrode, a negative electrode, and a solid electrolyte layer disposed between the positive electrode and the negative electrode, and at least one selected from the group consisting of the positive electrode, the negative electrode, and the electrolyte layer contains the solid electrolyte material of the present disclosure.