Solid Electrolyte Hybrid Cell Dividing Layer
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Solution Overview
Problem
Lithium cells face challenges in optimizing electrolyte performance and minimizing concentration gradients, leading to suboptimal rapid charge capacity due to the use of uniform electrolytes and lithium conductive salts across all layers.
Innovation Solution
Incorporating a lithium-ion conductive dividing layer between the cathode and separator layers, which is impermeable to solvents and lithium conductive salt anions, allowing for the use of different electrolytes and salts on either side, optimizing performance by minimizing concentration gradients and enhancing lithium ion selectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If uniform electrolytes and lithium conductive salts are used across all layers, then device complexity is reduced, but rapid charge capacity is suboptimal due to concentration gradients and inability to optimize for specific functions
Solution Approach 1:
The cell is divided into distinct functional zones by the dividing layer, allowing the cathode side and separator/anode side to use different electrolyte compositions optimized for their specific functions, thereby improving rapid charge capacity without requiring complete redesign of the entire cell structure
Solution Approach 2:
Different electrolyte compositions are applied to different regions of the cell - the cathode side uses electrolyte optimized for high rate capacity while the separator/anode side uses electrolyte optimized for its specific requirements, allowing each region to have the local properties needed for optimal performance
2Productivity
If different electrolytes and lithium conductive salts are used in cathode layer and separator layer, then rapid charge capacity is improved through optimization, but concentration gradients and salt enrichment issues arise
Solution Approach 1:
The dividing layer acts as an intermediary barrier that allows lithium ions to pass through while blocking solvent molecules and lithium conductive salt anions, thereby enabling the use of different electrolyte compositions on either side while preventing the development of harmful concentration gradients and salt enrichment
3Productivity
If a dividing layer impermeable to solvent and salt anions is introduced, then electrolyte optimization and rapid charge capacity are improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The dividing layer serves as a mediator that provides the necessary separation function to enable electrolyte optimization, accepting the added manufacturing complexity as a trade-off for achieving superior rapid charge capacity and performance optimization
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 dividing layer significantly improves the rapid charge capacity of lithium cells by decoupling the cathode and separator layers, enabling the use of diverse electrolytes and salts, thereby optimizing overall cell performance and preventing undesirable lithium salt enrichment.
Implementation Method 1
The dividing layer is in particular conductive for lithium ions and is impermeable for the at least one solvent of the cathode layer and/or of the separator layer and/or of the anode layer
Implementation Method 2
The dividing layer is in particular conductive for lithium ions and is impermeable for the at least one solvent of the cathode layer and/or of the separator layer and/or of the anode layer
Implementation Method 3
The separator layer is conductive for lithium ions
Implementation Method 4
When the cell is charged and discharged, lithium ions can become embedded in the lithium intercalation material and/or lithium insertion material, and then dislodged again
Data Source
AI summary
A lithium cell, in particular a lithium-metal and/or lithium-ion solid electrolyte-liquid electrolyte hybrid cell, is described that includes an anode layer and a cathode layer. A separator layer is situated between the anode layer and the cathode layer. The cathode layer and/or the separator layer and/or the anode layer includes at least one solvent and/or at least one lithium conductive salt. To improve the rapid charge capacity of the cell, a dividing layer is situated between the cathode layer and the separator layer, which dividing layer is conductive for lithium ions and is impermeable for the at least one solvent of the cathode layer and/or of the separator layer and/or of the anode layer, and/or is impermeable for lithium conductive salt anions of the at least one lithium conductive salt of the cathode layer and/or of the separator layer and/or of the anode layer.