Core-Shell Solid-State Electrolyte for Stable Electrode Contact
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Solution Overview
Problem
Solid state inorganic electrolytes in lithium-ion batteries face issues with flexibility, cracking during manufacturing and operation, and poor contact interfaces with electrodes, while solid state polymer electrolytes have lower ionic conductivity and stability limitations.
Innovation Solution
A solid state electrolyte composed of a ceramic powder and a nitrogen-containing aromatic copolymer, which forms a core-shell structure with the ceramic powder providing lithium ion transport channels and the copolymer offering mechanical strength, flexibility, and self-healing properties, ensuring effective contact interfaces and high ionic conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If solid state inorganic electrolyte is used, then ionic conductivity is improved, but flexibility and mechanical strength deteriorate
Solution Approach 1:
The patent employs a composite electrolyte system combining solid state inorganic electrolyte particles (providing high ionic conductivity) with a polymer matrix (providing flexibility and mechanical strength). This composite approach allows the electrolyte to achieve both high lithium ion conductivity (>0.1 mS cm−1 at room temperature) and sufficient mechanical flexibility to prevent cracking during battery operation and manufacturing.
2Temperature
If solid state inorganic electrolyte is used, then thermal stability is improved, but contact interface with electrodes deteriorates
Solution Approach 1:
The composite structure combines thermally stable inorganic electrolyte particles with a flexible polymer matrix that ensures good contact with electrode surfaces. The polymer component adapts to electrode expansion and contraction during cycling, maintaining intimate contact interfaces while the inorganic particles provide thermal stability above 100°C.
Solution Approach 2:
The patent optimizes the morphology and size distribution of inorganic electrolyte particles, using nanoscale particles (10-1000 nm) that can better conform to electrode surfaces. This parameter optimization improves contact interfaces while maintaining thermal stability.
3Ease of operation
If high pressure is applied to ensure good contact, then contact interface is improved, but cracking risk increases
Solution Approach 1:
The patent uses a flexible polymer matrix that naturally conforms to electrode surfaces without requiring high compression pressures. This flexible structure maintains good contact interfaces through its inherent adaptability, reducing the need for high pressure assembly and minimizing the risk of cracking in the solid state electrolyte layer.
4Reliability
If ceramic ion conducting material is used, then lithium ion conductivity is improved, but brittleness increases
Solution Approach 1:
The patent disperses ceramic ion conducting particles within a polymer matrix, creating a composite that exhibits both high lithium ion conductivity (from the ceramic particles) and flexibility (from the polymer). This composite approach eliminates the brittleness of pure ceramic materials while preserving their superior ionic conductivity properties.
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 enhances mechanical strength, flexibility, and ionic conductivity, maintaining stable contact interfaces and improving the overall performance of lithium-ion batteries by forming a uniform and efficient lithium ion channel.
Implementation Method 1
the ceramic powder provides lithium ion transport channels
Implementation Method 2
the copolymer offering mechanical strength, flexibility, and self-healing properties
Data Source
AI summary
A solid state electrolyte is provided, which includes a ligand composed of a ceramic powder and a nitrogen containing aromatic copolymer, the ceramic powder is the core and the receptor, the nitrogen containing aromatic copolymer is comprised by a first polymer and a second polymer, the first polymer is aromatic polyamide, the second polymer is selected from the group consisting of P2VP, P4VP, PVA, PEO and PAN. The solid state electrolyte can form good contact interfaces at the anode and cathode electrodes. A lithium-ion battery including the solid state electrolyte is also provided.