Electrode Structure With Conductive Intermediate Layer
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Lithium secondary batteries face a trade-off between high power and stability, with increased electrode resistance compromising power performance, and existing methods fail to adequately address both properties simultaneously.
Innovation Solution
An electrode structure is developed with a conductive intermediate layer having lower resistance than the active material layers, improving electrical conductivity and mechanical stability by reducing lithium ion diffusion paths and enhancing electron mobility, while increasing electrode density and capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the density and capacity of active material in the electrode are increased to achieve higher power and energy generation, then the power and energy generation improve, but the resistance of the electrode increases which compromises stability
Solution Approach 1:
A conductive intermediate layer is introduced between the first and second active material layers. This intermediate layer acts as a mediator that facilitates lithium ion transport and electron conduction, reducing the overall resistance of the electrode structure while maintaining high active material density and capacity, thus resolving the trade-off between power and stability
2Power
If the resistance of the electrode is reduced to improve power performance, then power performance improves, but the stability of the secondary battery may be compromised
Solution Approach 1:
The electrode structure employs a composite configuration with multiple active material layers having different characteristics and a conductive intermediate layer. This composite structure allows optimization of power performance through reduced resistance in the conductive layer while maintaining stability through the combined properties of different active materials, achieving both low resistance and high stability simultaneously
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 electrode structure achieves improved power and capacity by reducing resistance and enhancing lithium ion diffusion, thereby addressing the trade-off between power and stability in lithium secondary batteries.
Implementation Method 1
The conductive intermediate layer has a resistance lower than each resistance of the first active material layer and the second active material layer
Implementation Method 2
improving electrical conductivity and mechanical stability by reducing lithium ion diffusion paths
Data Source
AI summary
An electrode structure for a secondary battery includes a current collector, a first active material layer formed on at least one surface of the current collector, a second active material layer on the first active material layer, and a conductive intermediate layer interposed between the first active material layer and the second active material layer. The conductive intermediate layer has a resistance lower than each resistance of the first active material layer and the second active material layer. A lithium secondary battery including the electrode structure is provided.