Solid-State Battery Interface with Porous Carbon and Nanostructures
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional lithium-ion batteries face issues with high interfacial impedance at the solid electrolyte-anode interface due to limited contact surface area, affecting lithium-ion transfer in solid-state lithium batteries.
Innovation Solution
A porous, high surface area carbon electrolyte-anode interfacial layer with vertically aligned nanostructures, such as nanoneedles or nanowires, is introduced between the solid-state electrolyte and anode to enhance adhesion and contact area, improving lithium-ion transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a solid-state electrolyte is used instead of liquid electrolyte, then safety and energy density are improved, but interfacial impedance increases due to limited contact surface area
Solution Approach 1:
The patent transforms the flat 2D interface between solid electrolyte and anode into a 3D hierarchical structure with vertically aligned nanoneedles penetrating through porous carbon layers. This dimensional transformation dramatically increases the interfacial contact area from a planar surface to a multi-scale three-dimensional network, enabling more lithium-ion transfer pathways while maintaining solid-state safety advantages
Solution Approach 2:
The patent employs porous carbon materials with high surface area to volume ratio as an interfacial layer between the solid electrolyte and anode. The porous structure provides numerous channels for lithium-ion transport and increases the effective contact area, thereby reducing interfacial impedance while maintaining the solid-state battery's high energy density and safety characteristics
2Object-affected harmful factors
If the contact surface area between solid electrolyte and anode is increased, then interfacial impedance is reduced, but device complexity increases
Solution Approach 1:
The patent segments the interface into multiple functional layers: a porous carbon base layer providing high surface area, and vertically aligned nanoneedles extending from the solid electrolyte through the carbon layer. This segmentation creates distinct zones for different functions - the porous carbon provides structural support and ion transport pathways, while the nanoneedles provide direct contact points for lithium-ion transfer, collectively reducing interfacial impedance without requiring complete interface redesign
Solution Approach 2:
The patent introduces porous carbon as an intermediary material between the solid electrolyte and the anode. This intermediate layer serves as a bridge that increases contact area and facilitates lithium-ion transfer, reducing the direct interface complexity between the solid electrolyte and anode while maintaining effective ion transport
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 modified interface significantly reduces interfacial resistance, enhancing the performance and efficiency of solid-state lithium batteries by increasing the contact area and adhesion between the solid electrolyte and anode, thereby improving energy density and cycling rates.
Implementation Method 1
enhance adhesion and contact area
Implementation Method 2
porous, high surface area carbon
Data Source
AI summary
A solid-state battery cell includes a cathode, an anode, a solid-state electrolyte between the cathode and the anode, and an electrolyte-anode interfacial layer between the solid-state electrolyte and the anode. The electrolyte-anode interfacial layer comprises porous, high surface area carbon and nanostructures formed on an anode-facing surface of the solid-state electrolyte, wherein the nanostructures penetrate the porous, high surface area carbon.