Triple-Layer Solid Electrolyte Membrane for Short Ion Paths
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Solution Overview
Problem
All-solid-state rechargeable batteries face challenges in shortening lithium ion movement paths while preventing internal short circuits, as existing methods either limit solid electrolyte filling or cause side reactions with additives, affecting ionic conductivity and safety.
Innovation Solution
A solid electrolyte membrane with a triple-layer structure, including a core-shell composite of diamagnetic particles and a solid electrolyte shell, aligned perpendicular to the membrane plane using a magnetic field, to enhance ionic conductivity and prevent internal short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If solid electrolyte filling is increased to shorten lithium ion movement paths, then ionic conductivity is improved, but internal short circuits occur
Solution Approach 1:
The patent applies local quality by creating distinct functional zones within the solid electrolyte membrane: the first and third layers provide high-density filling for shortening ion paths, while the second layer with composite particles provides directional alignment and structural stability. Each layer has optimized local composition to balance conductivity and safety functions.
Solution Approach 2:
The patent uses composite materials by combining diamagnetic core particles with solid electrolyte shell particles to form a composite structure in the second layer. This composite approach enables both high ionic conductivity from the electrolyte shell and controlled particle alignment from the diamagnetic core, preventing internal short circuits while maintaining conductivity.
2Length of moving object
If additives are used to fill solid electrolyte, then lithium ion movement path is shortened, but side reactions occur
Solution Approach 1:
The patent employs ultrafine solid electrolyte particles with controlled size and shape that are optimized for high-density packing. These particles serve as disposable filling material that achieves short ion paths through efficient space utilization without requiring chemical additives that would cause side reactions.
3Productivity
If composite particles are aligned perpendicular to membrane plane, then high-rate capability is improved, but manufacturing complexity increases
Solution Approach 1:
The patent replaces complex mechanical alignment methods with a magnetic field-based approach. By applying an external magnetic field during membrane formation, the diamagnetic composite particles automatically align perpendicular to the membrane plane without requiring sophisticated mechanical positioning equipment or multi-step processing.
Solution Approach 2:
The patent changes the magnetic susceptibility parameter of the composite particles by incorporating diamagnetic materials with specific magnetic properties. This parameter change enables the particles to respond to external magnetic fields for alignment, simplifying the manufacturing process while achieving the desired perpendicular orientation for high-rate capability.
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 shortens lithium ion movement paths, improves ionic conductivity, and ensures battery safety by aligning the composite in the second layer, resulting in enhanced high-rate capability and reduced risk of internal short circuits.
Implementation Method 1
the composite comprises a diamagnetic core particle, and a shell surrounding the diamagnetic core particle
Implementation Method 2
the shell comprising a solid electrolyte material
Data Source
AI summary
A solid electrolyte membrane includes a first layer including solid electrolyte particles; a second layer on the first layer, the second layer including a composite; and a third layer on the second layer, the third layer including solid electrolyte particles, wherein the composite includes a diamagnetic core particle, and a shell surrounding the diamagnetic core particle, the shell including a solid electrolyte material.