Flexible Textile Battery Assembly for Polysulfide Containment
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Solution Overview
Problem
Current lithium-ion battery technologies face limitations in energy density, cost, and safety, particularly due to the insulating nature of elemental sulfur in lithium-sulfur batteries, which leads to inefficient active material utilization and poor cyclability.
Innovation Solution
The development of flexible energy storage systems incorporating electrospun, textile-like weaved assemblies with flexible cathodes, anodes, and gel-polymer electrolytes, including nanostructured fillers, to enhance ionic conductivity and prevent polysulfide dissolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If elemental sulfur is used as cathode material in lithium-sulfur batteries, then theoretical capacity and specific energy density are improved (1674 mAh/g and 2600 Wh/kg), but the insulating nature of sulfur leads to poor active material utilization and inefficient electrochemical performance
Solution Approach 1:
The patent employs composite materials by integrating sulfur into conductive carbon matrices (such as graphene, carbon nanotubes, or porous carbon structures) to create cathode composites. This composite approach maintains the high energy density of sulfur while the conductive carbon network provides electron transport pathways, resolving the insulating nature of pure sulfur and improving active material utilization.
Solution Approach 2:
The patent utilizes porous carbon structures as sulfur hosts, where the porous architecture provides high surface area for sulfur loading, efficient ion transport channels, and conductive networks. The porous structure allows better electrolyte penetration and maintains electrical conductivity throughout the cathode, addressing both the insulating problem and improving energy utilization.
2Reliability
If liquid organic electrolytes are used in lithium-sulfur batteries, then ionic conductivity is improved, but lithium polysulfides formed during cycling dissolve into the electrolyte causing loss of active material and poor cyclability
Solution Approach 1:
The patent employs porous solid electrolyte interphase (SEI) layers or porous polymer coatings on the cathode surface that allow efficient ion transport while physically blocking polysulfide dissolution into the bulk electrolyte. The porous structure maintains ionic conductivity through capillary action and surface conduction while preventing harmful polysulfide leakage, thus improving cyclability.
Solution Approach 2:
The patent introduces intermediary materials such as solid electrolyte interphase (SEI) layers, polymer coatings, or protective membranes between the sulfur cathode and liquid electrolyte. These intermediaries facilitate ion transport while blocking polysulfide dissolution, acting as a mediator that maintains ionic conductivity without causing active material loss.
3Reliability
If transition metal oxides or porous structures are used to trap sulfur and improve capacity, then active material utilization increases, but polysulfide dissolution into electrolyte is not completely prevented
Solution Approach 1:
The patent creates composite cathode structures combining sulfur with conductive carbon matrices and protective coating materials. This multi-component composite approach simultaneously improves electrical conductivity for better active material utilization and provides protective barriers to prevent polysulfide dissolution, overcoming the limitations of single-material approaches.
Solution Approach 2:
The patent utilizes thin film coatings (such as polymer films, oxide layers, or carbon shells) encapsulating sulfur particles or porous structures. These thin protective films provide physical barriers that prevent polysulfide dissolution into the electrolyte while maintaining porosity and conductivity for efficient ion and electron transport, thereby preventing substance loss without sacrificing active material utilization.
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
This approach results in improved energy density, extended cyclability, and enhanced mechanical properties, making the flexible energy storage systems suitable for large-scale energy storage applications while addressing safety concerns.
Implementation Method 1
an electrolyte that includes a flexible gel-polymer and a nanostructured filler
Implementation Method 2
Electrospinning is an efficient fabrication process that yields porous and fibrous membranes
Implementation Method 3
an electrolyte that includes a flexible gel-polymer and a nanostructured filler
Implementation Method 4
to enhance ionic conductivity and prevent polysulfide dissolution
Data Source
AI summary
The invention, relates to flexible, thin trim batteries for use in a variety of applications including, but not limited to, flexible electronics, flexible energy storage systems, wearable textile-like energy devices and various other integrated electronic and mobile device-based applications. The flexible, thin, film batteries allow the design and development of weavable, conformable, wearable and flexible components for advanced battery technology. The invention relates to flexible energy storage system that include an electrospun, textile-like, weaved assembly including a flexible cathode, a flexible anode, and an electrolyte. The electrolyte can include a flexible gel-polymer and a nanostractured filler.