Dual-Layer Solid Electrolyte for Uniform All-Solid-State Battery Interfaces
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Solution Overview
Problem
The existing all-solid-state batteries face issues with non-uniform interfaces between electrodes and the solid electrolyte layer, leading to increased interfacial resistance, reduced cell performance, and safety concerns due to lithium dendrite growth, primarily caused by pores or cracks in the solid electrolyte layer.
Innovation Solution
The implementation of a dual-layer solid electrolyte structure, where the first layer has a higher solid electrolyte concentration near the cathode and the second layer near the anode, utilizing specific sulfide-based electrolytes, binders, and solvents to ensure uniform distribution and minimize turbiscan stability index, preventing pore formation and enhancing interface stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single-layer solid electrolyte structure is used, then the manufacturing process is simple, but the interface uniformity between electrodes and solid electrolyte deteriorates
Solution Approach 1:
The solid electrolyte layer is divided into two separate layers: a first solid electrolyte layer adjacent to the cathode and a second solid electrolyte layer adjacent to the anode. Each layer can be independently manufactured and optimized, allowing for better control of interface uniformity while maintaining manufacturing feasibility through modular assembly.
Solution Approach 2:
Different regions of the solid electrolyte structure are assigned different properties. The first solid electrolyte layer near the cathode and the second solid electrolyte layer near the anode can have different compositions, thicknesses, or material characteristics optimized for their respective local environments, thereby improving overall interface uniformity.
2Productivity
If solid electrolyte is precipitated or condensed in the slurry, then the manufacturing process progresses, but pores or cracks form in the solid electrolyte layer
Solution Approach 1:
The slurry is prepared with pre-selected components (solid electrolyte particles, binder, dispersant, solvent) in specific proportions and with controlled characteristics before application. The dispersant and binder are pre-chosen to ensure stable suspension and prevent premature precipitation or condensation that would cause defects.
Solution Approach 2:
The composition parameters of the slurry are carefully controlled, including the ratios of solid electrolyte particles to binder and dispersant, the type and amount of solvent, and the viscosity characteristics. These parameter optimizations prevent excessive precipitation or condensation during the drying process, maintaining layer integrity.
3Ease of manufacture
If pores or cracks occur in the solid electrolyte layer, then the structure forms, but contact between electrodes and solid electrolyte becomes non-uniform
Solution Approach 1:
The solid electrolyte layers are constructed as composite materials combining solid electrolyte particles with binder and dispersant components. This composite structure provides mechanical integrity while maintaining uniform contact with electrodes, preventing the formation of pores or cracks that would disrupt contact uniformity.
4Ease of manufacture
If the solid electrolyte layer has non-uniform contact with electrodes, then the layer is formed, but interfacial resistance increases
Solution Approach 1:
The slurry composition and application process are optimized to achieve homogeneous distribution of solid electrolyte particles, binder, and dispersant throughout the layer. This homogeneity ensures uniform contact between the solid electrolyte layer and electrodes, minimizing interfacial resistance while maintaining ease of formation.
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 results in stable, uniform interfaces between the electrolyte and electrodes, reducing interfacial resistance, improving battery performance, and preventing lithium dendrite growth, thereby enhancing the overall capacity retention and Coulombic efficiency of the all-solid-state battery.
Implementation Method 1
a first dispersant, and a first solvent... The first dispersant may include one or more selected from the group consisting of carboxymethyl cellulose, carboxyethyl cellulose, and polypropylene glycol
Implementation Method 2
a first binder... The first binder may include one or more selected from the group consisting of nitrile butadiene rubber (NBR), hydrogenated nitrile butadiene rubber (HNBR), styrene butadiene rubber (SBR), butadiene rubber (BR), polyvinylidene fluoride (PVDF), and polytetraluoroethylene (PTFE)
Data Source
AI summary
Disclosed is an all-solid-state battery having uniform interfaces between electrodes and a solid electrolyte layer.