All-Solid Battery Intermediate Layer for Internal Resistance
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Solution Overview
Problem
All-solid lithium ion secondary batteries face challenges in reducing internal resistance due to differences in metal components between the positive electrode active material, negative electrode active material, and solid electrolyte, which hinders lithium ion conductivity and output current.
Innovation Solution
Incorporating an intermediate layer between the electrode and solid electrolyte layers, using compounds with shared types of metal elements like V, Ti, and Al, ensuring these elements are identical across the solid electrolyte, intermediate, and active material layers to enhance lithium ion conductivity and reduce internal resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If different metal components are used in positive electrode active material, negative electrode active material, and solid electrolyte, then material compatibility is achieved, but lithium ion conductivity between layers deteriorates
Solution Approach 1:
An intermediate layer is introduced between the solid electrolyte and electrode active materials. This intermediate layer contains metal elements (such as V, Ti, Al) that are also present in both the solid electrolyte and the electrode active materials, creating a compositional bridge that improves lithium ion conductivity across the interface while maintaining material compatibility.
Solution Approach 2:
The intermediate layer is specifically positioned at the interface between the solid electrolyte and electrode active materials where lithium ion transfer occurs. By concentrating the shared metal elements in this critical region, the patent enhances lithium ion conductivity precisely where it is most needed without altering the bulk composition of the electrode materials.
2Reliability
If solid electrolyte is used instead of organic electrolytic solution, then leakage prevention and reliability are improved, but lithium ion conductivity and output current deteriorate
Solution Approach 1:
The intermediate layer acts as a mediator between the solid electrolyte and electrode active materials, facilitating lithium ion transfer. By containing metal elements shared with both the solid electrolyte and electrode materials, the intermediate layer creates efficient conduction pathways that reduce the inherently higher resistance of solid electrolytes.
Solution Approach 2:
The patent creates a composite structure consisting of the solid electrolyte, intermediate layer, and electrode active materials. This composite approach combines the leakage-prevention benefits of solid electrolytes with the high conductivity characteristics of materials containing shared metal elements like V, Ti, and Al.
3Object-generated harmful factors
If intermediate layer is added between electrode and solid electrolyte, then lithium ion conductivity is improved, but device complexity increases
Solution Approach 1:
A single intermediate layer is introduced as a mediating component between the solid electrolyte and electrode active materials. This simple intermediary structure, containing shared metal elements, effectively reduces interfacial resistance without requiring complex multi-layer configurations.
Solution Approach 2:
The patent optimizes the composition of the intermediate layer by selecting metal elements (V, Ti, Al) that are shared between the solid electrolyte and electrode active materials. By adjusting the compositional parameters of the intermediate layer to match the metal content of adjacent layers, lithium ion conductivity is enhanced while maintaining structural simplicity.
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 approach significantly reduces internal resistance and improves battery performance by enhancing lithium ion conductivity and adhesion between layers, leading to higher output current and capacity.
Implementation Method 1
it is necessary to increase the ionic conductivity of lithium ions and reduce the internal resistance
Implementation Method 2
an intermediate layer made of a substance functioning as an active material or an electrolyte is formed at an interface between a positive electrode layer and/or a negative electrode layer and an electrolyte layer. Patent Literature 2 describes that the intermediate layer is formed when a positive electrode active material and/or a negative electrode active material, and a solid electrolyte react and/or diffuse
Data Source
AI summary
An all-solid lithium ion secondary battery has a pair of electrode layers and a solid electrolyte layer between the pair of electrode layers. In the all-solid lithium ion secondary battery, at least one electrode of the pair of electrodes has an active material layer and an intermediate layer on the surface of the active material layer on the side of the solid electrolyte layer, and each of the solid electrolyte layer, the intermediate layer, and the active material layer includes a compound containing Li and two or more shared types of metal elements other than Li, the two or more shared types of metal elements in the solid electrolyte layer, the intermediate layer, and the active material layer are identical between the solid electrolyte layer, the intermediate layer, and the active material layer.