All-solid-state battery cathode composite manufacturing
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Solution Overview
Problem
Conventional methods for manufacturing cathodes for all-solid-state batteries result in poor interfacial contact between cathode active materials, conductive materials, and solid electrolytes, leading to increased battery resistance and reduced performance.
Innovation Solution
A method involving solvent mixing and two-step vacuum drying is used to prepare a cathode composite by mixing a solid electrolyte precursor, a conductive material, and a cathode active material, reducing interfacial resistance and enhancing ionic conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If mechanical ball milling is used to mix cathode active material, conductive material and solid electrolyte, then the mixing process is simple and efficient, but the interfacial contact between materials does not occur properly, deteriorating battery performance
Solution Approach 1:
The patent changes the physical state parameter of the mixing system by introducing a liquid binder to create a slurry mixture, transforming the dry mechanical ball milling process into a wet chemical mixing process. This parameter change enables proper interfacial contact between cathode active material, conductive material, and solid electrolyte particles through solution-mediated bonding, while maintaining mixing efficiency.
Solution Approach 2:
The patent introduces a liquid binder as an intermediary substance that mediates the interaction between cathode active material, conductive material, and solid electrolyte. The binder creates a slurry mixture where particles are suspended and properly distributed, enabling effective interfacial contact that direct mechanical milling cannot achieve.
2Ease of manufacture
If mechanical ball milling is used to manufacture cathode, then the manufacturing process is straightforward, but variation in conductivity at the heterogeneous interface causes polarization phenomenon, increasing battery resistance
Solution Approach 1:
The patent changes the manufacturing approach from dry mechanical mixing to wet slurry preparation followed by drying. This parameter change in the manufacturing process enables uniform distribution of conductive material and solid electrolyte throughout the cathode active material matrix, eliminating conductivity variations and polarization phenomena while maintaining ease of manufacture.
Solution Approach 2:
The patent replaces the purely mechanical ball milling system with a combined chemical-physical process involving liquid binder dissolution, slurry formation, and thermal drying. This substitution of mechanical mixing with solution-based processing achieves superior conductivity uniformity and eliminates heterogeneous interface variations.
3Reliability
If solvent mixing and vacuum drying are used to prepare cathode composite, then interfacial resistance is reduced and ionic conductivity increases, but the manufacturing process becomes more complex
Solution Approach 1:
The patent applies preliminary action by thoroughly mixing all cathode materials in a liquid binder to form a homogeneous slurry before the drying step. This preliminary mixing ensures complete interfacial contact and uniform distribution of conductive material and solid electrolyte, so that the subsequent drying process simply removes the binder without compromising the already-established intimate material contact, achieving high ionic conductivity with manageable process complexity.
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
This approach improves ionic conductivity, leading to increased battery performance and capacity by ensuring better contact between the cathode active material, solid electrolyte, and conductive material.
Implementation Method 1
preparing a first mixture by mixing a solid electrolyte precursor and a first solvent; preparing a second mixture by mixing a conductive material, a cathode active material and a second solvent
Implementation Method 2
manufacturing a cathode composite by drying the third mixture
Data Source
AI summary
The present disclosure relates to a method of manufacturing a cathode composite for an all-solid-state battery and a method of manufacturing an all-solid-state battery including the same. In particular, the present disclosure relates to a method of manufacturing a cathode composite for an all-solid-state battery in which the cathode composite is manufactured by mixing a solid electrolyte, a conductive material and a cathode active material with a solvent, and then performing two-step vacuum drying, whereby interfacial resistance between the cathode active material, the solid electrolyte and the conductive material is reduced to thus increase ionic conductivity, thereby improving battery performance and capacity, and a method of manufacturing an all-solid-state battery including the same.