Composite Solid-State Electrolyte for Low Interfacial Impedance
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Solution Overview
Problem
Solid state lithium ion batteries face high impedance due to poor lithium transport through solid materials and across solid-solid interfaces, limiting their performance and adoption.
Innovation Solution
A composite solid state electrolyte comprising a polymer electrolyte material, a ceramic ion conductor, and a functionalized coupling agent is developed, where the coupling agent is compatible with both the ceramic and polymer components, reducing interfacial impedance and enhancing lithium ion transport.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If solid state electrolytes are used to eliminate liquid components, then safety and energy density are improved, but interfacial impedance increases and lithium ion transport deteriorates
Solution Approach 1:
A coupling agent is introduced as an intermediary substance at the interface between the ceramic ion conductor and polymer electrolyte material. This coupling agent has dual compatibility: one end interacts with the ceramic surface while the other end interacts with the polymer matrix, thereby mediating the interface and reducing interfacial impedance to improve lithium ion transport across the solid-solid boundary
Solution Approach 2:
The patent creates a composite solid state electrolyte system combining ceramic ion conductors, polymer electrolyte materials, and coupling agents. This composite structure leverages the high ionic conductivity of ceramics, the flexibility and processability of polymers, and the interfacial compatibility of coupling agents to achieve both safety and low interfacial impedance
2Quantity of substance
If multiple solid components are assembled, then energy density is improved, but the number of interfaces increases and lithium ion transport is impeded
Solution Approach 1:
The coupling agent serves as a mediating layer at each solid-solid interface, enabling effective lithium ion transport across multiple interfaces without requiring additional complex interfacial engineering for each contact point
Solution Approach 2:
The coupling agent provides universal interfacial compatibility across different ceramic-polymer combinations, allowing the same coupling agent to function at multiple different interfaces within the battery structure, thereby simplifying the overall interface management
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 composite electrolyte significantly reduces interfacial impedance, improving ionic conductivity and enabling more efficient lithium ion transport, thereby enhancing the performance of solid state battery cells.
Implementation Method 1
The functionalized coupling agent is compatible with the ceramic ion conductor and the bulk polymer compound, reducing interfacial impedance and enhancing lithium ion transport
Data Source
AI summary
A composite solid state electrolyte comprises a polymer electrolyte material, a ceramic ion conductor, and a functionalized coupling agent selected to be compatible with the ceramic ion conductor and the bulk polymer compound. The polymer electrolyte material comprises a bulk polymer compound and a lithium salt. The functionalized coupling agent has a backbone that is structurally similar to the bulk polymer compound.