Polyester-Polymer Ceramic Electrolyte for Sodium Battery Interfacial Impedance
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Solution Overview
Problem
Non-aqueous electrolytes, particularly solid-state ceramic electrolytes, face challenges such as scalability issues, high interfacial impedance, and cost, which hinder their commercialization in energy storage devices like sodium metal batteries.
Innovation Solution
A non-aqueous electrolyte comprising a polymeric component, such as a polyester-based or polyether-based polymer, combined with a ceramic component like sodium super ionic conductors (NASICON), is developed using a solid-state mixing method to enhance ionic conductivity, mechanical strength, and interfacial compatibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If solid-state ceramic electrolytes are used, then ionic conductivity is improved, but manufacturing scalability and cost are worsened
Solution Approach 1:
The patent creates a composite electrolyte by combining polymeric materials (PEO, PPC, PEC) with ceramic fillers (NASICON, LLZO). This composite structure allows the system to achieve high ionic conductivity from the ceramic component while maintaining the flexibility and ease of manufacturing from the polymeric component. The composite approach resolves the contradiction by integrating the advantages of both material types.
Solution Approach 2:
The patent modifies the physical and chemical parameters of the electrolyte system by controlling the molecular weight, glass transition temperature, and composition ratios of the polymeric and ceramic components. By optimizing these parameters, the electrolyte achieves high ionic conductivity while remaining processable through solution casting and solid-state mixing methods, thus improving manufacturability without sacrificing performance.
2Reliability
If solid-state ceramic electrolytes are used, then ionic conductivity is improved, but interfacial impedance is worsened
Solution Approach 1:
The polymeric component acts as an intermediary between the ceramic filler particles and the electrodes. The polymer matrix provides a flexible interface that reduces impedance at the electrolyte-electrode boundaries, while the ceramic fillers embedded within provide high ionic conductivity pathways. This intermediary role of the polymer resolves the interfacial impedance issue while maintaining bulk ionic conductivity.
Solution Approach 2:
The patent creates local quality variations by distributing ceramic fillers non-uniformly within the polymeric matrix, concentrating ionic conductivity enhancement at specific regions while maintaining good interfacial contact elsewhere. The polymer ensures continuous contact with electrodes, locally optimizing the interface quality to reduce impedance.
3Adaptability or versatility
If polyester-based polymers are used, then interfacial compatibility is improved, but chemical stability is worsened due to reaction with sodium metal
Solution Approach 1:
The patent creates a composite where polyester-based polymers (PPC, PEC) are combined with polyether-based polymers (PEO) and ceramic fillers. The polyester component provides interfacial compatibility and spontaneous reaction with sodium to form wetting agents, while the polyether and ceramic components provide chemical stability. This composite structure allows the system to benefit from both reactive and stable components simultaneously.
Solution Approach 2:
The patent converts the harmful reaction between polyester and sodium metal into a beneficial effect. The spontaneous reaction of polyester with sodium metal anode creates an interfacial wetting agent that reduces interfacial impedance. By controlling this reaction through the composite structure, the previously harmful chemical instability becomes a useful mechanism for improving interfacial contact.
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 achieves significantly higher ionic conductivity, reduced interfacial impedance, and improved mechanical strength, making the electrolyte more viable for commercial applications in energy storage devices, particularly sodium metal batteries, with enhanced cycling performance and stability.
Implementation Method 1
the polyester spontaneously reacts with Na metal anode through random chain scission by sodium (Na) metal to form an interfacial wetting agent that decreases the interfacial impedance
Implementation Method 2
the mixing occurs by solid-state mixing
Implementation Method 3
Non-aqueous electrolytes, for example solid-state ceramic electrolytes, can have the benefit of high ionic conductivity
Data Source
AI summary
In an embodiment, the present disclosure pertains to a non-aqueous electrolyte. In some embodiments, the non-aqueous electrolyte includes a polymeric component and a ceramic component. The polymeric component includes a polyester-based polymer and a polyether-based polymer. The ceramic component includes inorganic materials. In an additional embodiment, the present disclosure pertains to an energy storage device including an anode, a cathode, and a non-aqueous electrolyte of the present disclosure. In a further embodiment, the present disclosure pertains to a method of making a non-aqueous electrolyte by mixing a polymeric component and a ceramic component of the present disclosure.