Solid Electrolyte Composition with Linear Structures for Battery Interface Resistance
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Solution Overview
Problem
All-solid state secondary batteries face challenges with interface resistance and cycle characteristics due to the adhesion of particulate polymer and solid particles, which affects the expansion and contraction of active materials during charging and discharging.
Innovation Solution
A solid electrolyte composition with linear structures having a high aspect ratio, an inorganic sulfide-based electrolyte, and organic solvents is used, forming a network-like structure that traps active material particles and maintains lithium ion conduction, reducing interface resistance and improving cycle characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If particulate polymer is used as binding agent, then interface resistance between solid particles is suppressed, but followability with respect to expansion and contraction of active materials deteriorates
Solution Approach 1:
The invention changes the shape parameter of the polymer from particulate to linear, creating a fundamental structural transformation. This parameter change enables the polymer to form a network structure that can dynamically adapt to volume changes of active materials while maintaining low interface resistance, thus resolving the contradiction between interface resistance suppression and cycle characteristic improvement.
Solution Approach 2:
The invention creates a composite structure where linear polymer forms a continuous network matrix that embeds and supports inorganic solid electrolyte particles and active materials. This composite architecture combines the low interface resistance property of the polymer network with the ionic conductivity of inorganic electrolytes, achieving both low resistance and excellent cycle stability.
2Stability of the object's composition
If linear structures with high aspect ratio are used, then followability with respect to expansion and contraction of active materials is improved, but device complexity increases
Solution Approach 1:
The linear polymer structures automatically form a three-dimensional network structure through self-assembly when dispersed in the slurry. This self-organizing capability eliminates the need for complex external structuring processes, allowing the polymer to spontaneously create the required support framework that adapts to active material expansion and contraction, thus improving cycle characteristics without proportionally increasing manufacturing 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
The solution results in all-solid state secondary batteries with low resistance and excellent cycle characteristics, ensuring the stability of lithium ion conduction and peeling of inorganic solid electrolytes during battery operation.
Implementation Method 1
linear structures having an average diameter of 0.001 to 1 μm, an average length of 0.1 to 150 μm, a ratio of the average length to the average diameter of 10 to 100,000
Implementation Method 2
an inorganic solid electrolyte having ion conductivity of ions of metals belonging to Group I or II of the periodic table
Data Source
AI summary
Provided are a solid electrolyte composition containing an inorganic solid electrolyte having ion conductivity of ions of metals belonging to Group I or II of the periodic table, linear structures having an average diameter of 0.001 to 1 μm, an average length of 0.1 to 150 μm, a ratio of the average length to the average diameter of 10 to 100,000, and an electric conductivity of 1×10−6 S/m or less, and organic solvents, an electrode sheet for an electric state secondary battery and an all-solid state secondary battery for which the solid electrolyte composition is used, and methods for manufacturing an electrode sheet for an all-solid state secondary battery and an all-solid state secondary battery.