Cathode Mixture Composition for Solid Electrolyte Ion Transport
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Solution Overview
Problem
The performance of lithium-sulfur batteries with solid electrolytes is affected by the method of mixing lithium sulfide-based cathode active materials, conductive materials, and solid electrolytes, leading to fluctuations in cathode performance and ion transport ability.
Innovation Solution
A cathode mixture is developed comprising a lithium sulfide composite and a solid electrolyte, where the components are mildly mixed to prevent damage to the solid electrolyte, thereby enhancing ion transport ability and capacity characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If lithium sulfide-based cathode active material, conductive material, and solid electrolyte are mixed using conventional methods, then mixing is achieved, but the solid electrolyte is damaged leading to reduced ion transport ability
Solution Approach 1:
The patent changes the mixing parameters by controlling the mixing time to be 5 minutes or less and using a specific mixing intensity that prevents solid electrolyte damage. This parameter optimization resolves the contradiction by achieving adequate mixing while preserving the solid electrolyte structure and ion transport ability.
2Stability of the object's composition
If mixing time is extended to ensure thorough mixing, then homogeneity is improved, but solid electrolyte damage increases reducing cathode performance
Solution Approach 1:
The patent applies partial mixing action by limiting the mixing time to 5 minutes or less, which is sufficient to achieve the required homogeneity without causing excessive damage to the solid electrolyte. This partial action approach resolves the contradiction by finding the optimal point where adequate mixing is achieved before damage becomes significant.
3Object-affected harmful factors
If solid electrolyte is used to eliminate combustion risk, then safety is improved, but cathode performance fluctuates depending on mixing method
Solution Approach 1:
The patent changes the mixing parameters (time ≤ 5 minutes, controlled intensity) to prevent solid electrolyte damage, thereby ensuring consistent cathode performance while maintaining the safety benefits of using solid electrolyte. This resolves the contradiction by optimizing mixing conditions to preserve both safety and performance consistency.
Data Source
AI summary
A cathode mixture, a cathode including the same, an all-solid-state secondary battery including the cathode, and a method of manufacturing the all-solid-state secondary battery are provided. The cathode mixture includes a lithium sulfide composite and a solid electrolyte, wherein, in an X-ray diffraction analysis spectrum, a first peak that appears (e.g., exists) at a diffraction angle 2θ of about 26° to about 27.5° has a first intensity (IA), a second peak that appears (e.g., exists) at a diffraction angle 2θ of about 30.02° to about 30.06° has a second intensity (IB), and an intensity ratio ((IB/IA) of the second intensity to the first intensity satisfies 1<IB/IA≤2.