Multilayer Polymeric Sheet for Lithium Battery Gas Sorption
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Solution Overview
Problem
Existing rechargeable lithium batteries lack an effective means to sorb harmful substances generated during operation, as prior solutions using getter materials are not compatible with the electrolyte and are inefficient in removing gases present or generated inside the battery.
Innovation Solution
A rechargeable lithium battery design incorporating a multilayer polymeric sheet with an inner layer containing getter materials for sorption of harmful substances, protected by an external impermeable polymeric layer that prevents electrolyte interaction, allowing for the free choice of getter materials based on the specific harmful substances present.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If getter materials are used to sorb harmful substances in lithium batteries, then the sorption capability of harmful gases is improved, but the compatibility with electrolyte deteriorates
Solution Approach 1:
The barrier is divided into multiple functional layers: an inner layer containing getter material particles embedded in polymeric material for sorption, and external protective layers made of polymeric material impermeable to electrolyte. This segmentation allows each layer to perform its specific function without interference from the electrolyte.
Solution Approach 2:
The polymeric material acts as an intermediary between the getter material and the electrolyte. The protective layers are permeable to harmful substances allowing them to reach the getter material, but impermeable to the electrolyte, thus protecting the getter material from electrolyte degradation while maintaining sorption functionality.
2Object-affected harmful factors
If a protective layer impermeable to electrolyte is added to protect getter material, then the electrolyte compatibility is improved, but the device complexity increases
Solution Approach 1:
The protective layers are implemented as thin polymeric films that can be easily applied to the battery components. These flexible thin films provide electrolyte impermeability without adding significant structural complexity or volume to the battery design.
Solution Approach 2:
The barrier is constructed as a composite structure combining polymeric material with getter material particles. This composite approach integrates the protective and sorptive functions into a single multi-layer component, reducing the number of separate parts needed and simplifying the overall device structure.
3Ease of manufacture
If getter materials are directly exposed to electrolyte, then the manufacturing simplicity is improved, but the duration of action deteriorates due to degradation
Solution Approach 1:
The protective layers are pre-applied to the getter material before installation in the battery, creating a permanent barrier against electrolyte degradation. This preliminary protective action ensures the getter material maintains its sorption capability throughout the battery's operational lifetime.
Solution Approach 2:
The composite structure of polymeric protective layers encapsulating getter material particles provides long-term protection while maintaining manufacturing feasibility. The layers are bonded to form an integrated component that can be installed as a single unit, balancing manufacturing simplicity with enhanced durability.
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 multilayer polymeric sheet effectively sorbs harmful substances like CO2, CO, H2O, and HF without reacting with the electrolyte, enhancing the battery's safety and operational stability by selectively permeating harmful gases while maintaining electrolyte impermeability.
Implementation Method 1
an inner layer of a polymeric material containing particles of one or more getter materials for the sorption of said harmful substances
Implementation Method 2
at least one external protective layer of a polymeric material being impermeable to the electrolyte
Implementation Method 3
all the polymeric materials are permeable to said harmful substances
Data Source
AI summary
Rechargeable lithium batteries are described comprising an airtight container, electrodes immersed in an electrolytic solution and spaced apart by means of one or more separators, electrical contacts connected to the electrodes and a means for sorbing harmful substances formed of a multilayer polymeric sheet comprised of an inner layer of a polymeric material containing particles of one or more getter materials for the sorption of the harmful substances, and at least one external protective layer of a polymeric material impermeable to the electrolyte, wherein all the polymeric materials are permeable to the harmful substances.