Sulfide Solid Electrolyte Particle Circularity for Higher Ionic Conductivity
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Solution Overview
Problem
Sulfide-based inorganic solid electrolyte particles in lithium ion batteries have room for improvement in ionic conductivity, which is essential for enhancing battery performance.
Innovation Solution
Designing sulfide-based inorganic solid electrolyte particles with a specific frequency distribution of circularity, where the 10% cumulative value D10 is between 0.54 and 0.80, and a number-based median size d50 of 0.1 to 10 μm, to optimize particle shape and size for improved ionic conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sulfide-based inorganic solid electrolyte particles are used in lithium ion batteries, then the battery can achieve solid-state operation without combustible organic solvents, but the ionic conductivity is insufficient for optimal battery performance
Solution Approach 1:
The patent changes the shape parameter (circularity) of the solid electrolyte particles from conventional irregular shapes to highly circular shapes (D10 of 0.54 to 0.80). This parameter change improves ionic conductivity by enhancing particle packing density and reducing void spaces, while maintaining the safety benefits of solid-state operation without combustible solvents.
2Ease of manufacture
If conventional irregular-shaped solid electrolyte particles are used, then manufacturing is simpler, but particle packing efficiency and ionic conductivity are reduced due to increased gaps between particles
Solution Approach 1:
The patent modifies the shape parameter by controlling the circularity of particles during the sintering process. By adjusting sintering conditions to achieve highly circular particle shapes with D10 of 0.54 to 0.80, the patent improves ionic conductivity through better particle contact while keeping the manufacturing process based on conventional solid-state sintering methods.
3Device complexity
If solid electrolyte particles with poor shape control are used, then the manufacturing process is less complex, but the contact area between particles is reduced leading to lower ionic conductivity
Solution Approach 1:
The patent changes the geometric parameter of particle shape by optimizing sintering conditions to produce highly circular particles. This shape control is achieved through parameter adjustment in the sintering process rather than adding complex post-processing steps, thereby improving ionic conductivity while limiting increases in device complexity.
Data Source
AI summary
Provided is an inorganic solid electrolyte material including sulfide-based inorganic solid electrolyte particles. In a frequency distribution of circularity of the particles where the circularity of the particles in the material is plotted on a horizontal axis and a number-based frequency is plotted on a vertical axis, a 10% cumulative value D10 is 0.54 to 0.80. In addition, a number-based median size d50 of the particles in the material is 0.1 to 10 μm.