LiCB9H10-LiCB11H12 Solid Electrolyte for Room-Temperature Ion Conductivity
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Solution Overview
Problem
Current lithium ion secondary batteries face challenges with flammable organic solvents, low energy density, and ion conductivity issues in solid electrolytes, particularly with sulfide and complex hydride materials, which affect safety and performance in large energy storage applications.
Innovation Solution
A method of manufacturing an ion conductor by mixing LiCB9H10 and LiCB11H12 in a specific molar ratio, followed by mechanical milling, resulting in an ion conductor with enhanced ion conductivity and stability, suitable for use in all-solid batteries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sulfide solid electrolyte is used, then ion conductivity is improved, but stability against water and oxygen deteriorates
Solution Approach 1:
The patent uses a composite solid electrolyte comprising sulfide particles and complex hydride particles. The sulfide phase provides high ion conductivity while the complex hydride phase provides stability against water and oxygen. This composite structure allows both materials to work together, with each contributing its advantageous property to the overall system.
2Stability of the object's composition
If complex hydride solid electrolyte is used, then stability against water and oxygen is improved, but ion conductivity deteriorates
Solution Approach 1:
The patent uses a composite solid electrolyte comprising sulfide particles and complex hydride particles. The sulfide phase provides high ion conductivity while the complex hydride phase provides stability against water and oxygen. This composite structure allows both materials to work together, with each contributing its advantageous property to the overall system.
3Reliability
If thin-film type all-solid battery is used, then interface bonding is improved, but energy density deteriorates
Solution Approach 1:
The patent changes the physical state parameter of the solid electrolyte from thin-film to bulk granular form. This parameter change allows the battery to transition from thin-film type to bulk type, thereby increasing energy density while maintaining adequate interface bonding through the granular contact between particles.
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 ion conductor achieves high ion conductivity and stability, maintaining performance at room temperature, reducing the risk of decomposition with water or oxygen, and enhancing the energy density of all-solid batteries.
Implementation Method 1
mixing LiCB9H10 and LiCB11H12 in a molar ratio of LiCB9H10/LiCB11H12=1.1 to 20
Implementation Method 2
the mixing is conducted by mechanical milling treatment
Data Source
AI summary
A method for manufacturing an ion conductor including LiCB9H10 and LiCB11H12 is provided. The method includes mixing LiCB9H10 and LiCB11H12 in a molar ratio of LiCB9H10/LiCB11H12=1.1 to 20. An ion conductor including lithium (Li), carbon (C), boron (B) and hydrogen (H) is also provided. The ion conductor has X-ray diffraction peaks at at least 2θ=14.9±0.3 deg, 16.4±0.3 deg and 17.1±0.5 deg in X ray diffraction measurement at 25° C., and has an intensity ratio (B/A) of 1.0 to 20 as calculated from A=(X-ray diffraction intensity at 16.4±0.3 deg)−(X-ray diffraction intensity at 20 deg) and B=(X-ray diffraction intensity at 17.1±0.5 deg)−(X-ray diffraction intensity at 20 deg).