Coated Active Material for Low-Resistance Sulfide Electrolyte Interfaces
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Solution Overview
Problem
Existing battery technologies face challenges in reducing interface resistance, particularly when a sulfide solid electrolyte is oxidatively decomposed during charging, leading to inefficiencies and performance issues.
Innovation Solution
A coated active material is developed with a specific coating layer composition and airflow classification method to control the mass ratio of coarse and fine powders, ensuring a low R2/R1 value, which reduces interface resistance by preventing direct contact between the active material and solid electrolyte, thereby enhancing ion conductivity and oxidation resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a coating layer is applied to prevent direct contact between active material and solid electrolyte, then interface resistance is reduced, but manufacturing complexity increases due to coating process control requirements
Solution Approach 1:
The patent applies parameter changes by controlling the mass content ratio of coating material in classified powders (R2/R1 < 7.1) to optimize coating thickness and distribution. This quantitative parameter control achieves reduced interface resistance while maintaining manufacturability through defined numerical criteria.
Solution Approach 2:
The patent implements preliminary action by performing airflow classification before electrode assembly to pre-determine the coating material distribution. This preliminary classification ensures optimal coating properties are achieved before the materials are assembled into the final battery structure, reducing interface resistance proactively.
2Manufacturing precision
If airflow classification is used to control powder distribution, then coating uniformity is improved, but production time increases due to classification step
Solution Approach 1:
The patent utilizes pneumatic principles through airflow classification to separate and distribute powder particles based on their aerodynamic properties. This pneumatic classification method achieves uniform coating distribution efficiently, balancing manufacturing precision with reasonable production time through fluid-based separation.
3Reliability
If coating material mass ratio R2/R1 is kept low, then interface resistance is reduced, but coating material consumption increases
Solution Approach 1:
The patent optimizes the balance between interface resistance and material consumption by establishing a specific parameter threshold (R2/R1 < 7.1). This parameter optimization ensures sufficient coating coverage for low interface resistance while avoiding excessive coating material application, achieving economic efficiency.
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 solution effectively reduces interface resistance, improving battery output and performance by maintaining the stability of the solid electrolyte and optimizing the coating layer's composition and thickness, leading to enhanced energy density and charge/discharge efficiency.
Implementation Method 1
a coating layer coating at least a part of the surface of the active material... preventing direct contact between the active material and solid electrolyte
Implementation Method 2
when a coarse powder and a fine powder included in the powder of the coated active material are classified by airflow classification
Data Source
AI summary
The coated active material of the present disclosure includes an active material and a coating layer coating at least a part of the surface of the active material. The coating layer includes a first coating material. When a coarse powder and a fine powder included in the powder of the coated active material are classified by airflow classification such that the mass ratio of the coarse powder and the fine powder is 9:1, the value of R2/R1 is less than 7.1, where R1 represents the mass content ratio of the first coating material in the coarse powder, and R2 represents the mass content ratio of the first coating material in the fine powder.