Solid Electrode Ion Conduction via Segmented Interfaces
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Solution Overview
Problem
All-solid lithium ion secondary batteries face challenges due to high interface resistance between the solid electrolyte and active material, leading to detachment during charge and discharge cycles, which hinders favorable charge-and-discharge cycles.
Innovation Solution
Incorporating solid electrolyte particles with first ion conductivity, such as alkali metal ions excluding lithium, into the active material-containing layer, positioned away from the active material particles, to facilitate lithium ion conduction and reduce concentration polarization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If solid electrolyte and active material are welded together under heat, then interface resistance is reduced, but active material detaches during charge and discharge cycles due to expansion and contraction
Solution Approach 1:
The invention introduces an intermediate layer between the solid electrolyte and active material, segmenting the interface into multiple zones. This intermediate layer acts as a buffer that accommodates the expansion and contraction of the active material during charge-discharge cycles, preventing direct detachment while maintaining low interface resistance for efficient ion transport.
Solution Approach 2:
The intermediate layer serves as a mediator between the solid electrolyte and active material. It facilitates ion transport while mechanically cushioning the thermal and volumetric stresses, thereby simultaneously reducing interface resistance and preventing detachment during cycling.
2Productivity
If solid electrolyte particles with first ion conductivity are positioned away from active material particles, then lithium ion conduction is facilitated and concentration polarization is reduced, but device complexity increases
Solution Approach 1:
The invention creates local quality variations within the electrode by positioning solid electrolyte particles with first ion conductivity in specific regions away from active material particles. This local arrangement optimizes lithium ion conduction pathways and reduces concentration polarization in high-current-density areas without requiring complete structural redesign.
Solution Approach 2:
The invention adds a spatial dimension consideration by strategically positioning functional particles in three-dimensional space within the electrode. By creating differentiated zones with specific particle arrangements, the design optimizes ion transport pathways without significantly increasing overall device 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
This configuration enhances rate characteristics and low-temperature performance by accelerating lithium ion insertion and desolvation, improving the battery's cycle stability and efficiency.
Implementation Method 1
The solid electrolyte particles have first ion conductivity
Implementation Method 2
accelerating lithium ion insertion and desolvation
Data Source
AI summary
According to one embodiment, an electrode is provided. The electrode includes an active material-containing layer including active material particles and solid electrolyte particles being present away from the active material particles. The active material particles have lithium ion conductivity. The solid electrolyte particles have first ion conductivity. The solid electrolyte particles include a first ion that is at least one selected from the group consisting of an alkali metal ion excluding a lithium ion, a Ca ion, an Mg ion, and an Al ion.