Anode Interlayer for All-Solid Secondary Battery
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
All-solid secondary batteries face issues with lithium dendrite growth and increased internal resistance due to non-uniform current density and lithium ion migration at the interface between the solid electrolyte and anode layers, leading to potential short-circuits and reduced battery performance.
Innovation Solution
An anode interlayer comprising an active material capable of lithiation and delithiation, combined with an ion-conductive polymer and an electron-conductive polymer, is introduced to enhance uniformity of current density and lithium ion migration, thereby suppressing lithium dendrite growth and internal resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a solid electrolyte layer is used instead of liquid electrolyte, then safety is improved, but internal resistance increases and lithium dendrite growth occurs
Solution Approach 1:
An anode interlayer is introduced as an intermediary component between the solid electrolyte layer and the anode layer. This interlayer mediates the interface interactions, improving lithium ion migration uniformity and suppressing dendrite growth while maintaining the safety benefits of solid electrolytes.
Solution Approach 2:
The anode interlayer is constructed as a composite material containing both ion-conductive polymer particles and electron-conductive polymer particles. This composite structure simultaneously provides ionic conductivity for lithium ion transport and electronic conductivity for charge collection, reducing internal resistance while maintaining safety.
2Reliability
If a solid electrolyte layer is used instead of liquid electrolyte, then safety is improved, but lithium dendrite growth and short-circuit risk increase
Solution Approach 1:
The anode interlayer serves as a mediator at the solid electrolyte-anode interface, preventing direct harmful interactions that lead to dendrite formation. The interlayer's dual-conductive composition promotes uniform lithium ion distribution, eliminating concentration gradients that drive dendrite growth.
Solution Approach 2:
The invention changes the physical and chemical parameters at the interface by introducing a layer with optimized ionic and electronic conductivity ratios. This parameter modification creates a more favorable environment for uniform lithium deposition, suppressing dendrite formation while maintaining the inherent safety of solid electrolytes.
3Device complexity
If conventional anode structure is used, then device complexity is low, but current density uniformity and lithium ion migration uniformity are poor
Solution Approach 1:
The anode structure is segmented into multiple functional layers: the solid electrolyte layer, the anode interlayer with dual-conductive polymers, and the anode layer containing active material. This segmentation allows each layer to perform its specific function optimally, improving current density uniformity and lithium ion migration while maintaining relatively simple overall structure.
Solution Approach 2:
The anode interlayer uses a composite of ion-conductive and electron-conductive polymers to achieve uniform current and ion distribution. The ion-conductive polymer facilitates lithium ion transport while the electron-conductive polymer ensures uniform electron supply, creating a balanced interface that improves stability without significantly increasing complexity.
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 anode interlayer improves the high-rate capability and lifespan of the battery by stabilizing the active material, reducing internal resistance, and preventing lithium dendrite formation, resulting in enhanced energy density and cycle characteristics.
Implementation Method 1
the first conductive binder includes an ion-conductive polymer, wherein the ion-conductive polymer includes lithium as a substituent
Implementation Method 2
the second conductive binder includes an electron-conductive polymer
Implementation Method 3
an active material capable of undergoing lithiation and delithiation
Data Source
AI summary
An anode interlayer for an all-solid secondary battery includes: an active material capable of undergoing lithiation and delithiation; a first conductive binder; and a second conductive binder, wherein the active material includes carbon or a combination of carbon and a first metal, the first conductive binder includes an ion-conductive polymer, the ion-conductive polymer includes lithium as a substituent, and the second conductive binder includes an electron-conductive polymer.