Perovskite Battery Passivation Layer for Anion Migration Stability
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Solution Overview
Problem
Perovskite batteries face issues with anion migration during the preparation process, leading to electrode decomposition and reduced long-term stability due to defect sites with rapid ion movement.
Innovation Solution
A passivation layer with larger-volume anions and smaller-volume cations is introduced between the perovskite layer and the electrode layer, forming a potential barrier to hinder anion migration and compensate for defects, improving stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a passivation layer with larger-volume anions and smaller-volume cations is introduced to form a potential barrier, then anion migration is hindered and long-term stability is improved, but device structure becomes more complex
Solution Approach 1:
A passivation layer comprising a passivation material is introduced as an intermediary between the perovskite layer and the electrode layer. This passivation layer contains anions and cations with specific volume relationships (V1>V3>V2) that create a potential barrier, hindering anion migration while compensating for defects in the perovskite layer, thereby improving long-term stability without requiring fundamental structural changes to the battery architecture.
Solution Approach 2:
The passivation material is designed as a composite structure containing both anions and cations with specific volume characteristics. By combining materials with different ionic volumes in a controlled ratio, the passivation layer achieves dual functionality: forming a potential barrier against anion migration while providing defect compensation, thus resolving the stability-complexity contradiction through material composition rather than structural complexity.
2Reliability
If the passivation layer uses larger-volume anions (V1>V3) to block defect sites, then anion migration is reduced, but the probability of anions entering the perovskite layer through defects decreases
Solution Approach 1:
The passivation layer is designed with larger-volume anions (V1>V3) that preemptively block defect sites on the perovskite layer surface before harmful anion migration can occur. By positioning these large anions at the interface, they create steric hindrance and electrostatic repulsion that prevent both perovskite anions from migrating and external anions from entering through defects, thus addressing multiple harmful effects simultaneously.
Solution Approach 2:
The invention changes the ionic volume parameters of the passivation material, specifically selecting anions with volume V1 greater than the largest defect volume V3 in the perovskite layer. This parameter change creates a size-matching effect where the large anions physically block defect sites while their charge characteristics create electrostatic barriers, thereby controlling anion migration and entry probabilities through deliberate parameter selection.
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 passivation layer effectively reduces anion migration to the electrode, preventing reaction and decomposition, thereby enhancing the long-term stability of the perovskite battery.
Implementation Method 1
V1>V2, smaller-volume cations in the passivation layer are prone to movement, while larger-volume anions in the passivation layer are difficult to move, forming a potential barrier between the anions and cations in the passivation layer
Implementation Method 2
V3>V2, cations can enter the perovskite layer, compensating for the defects in the perovskite layer
Data Source
AI summary
A perovskite battery and an electric device are disclosed. The perovskite battery includes a substrate; a perovskite layer, where the perovskite layer is disposed on one side of the substrate; a passivation layer, where the passivation layer is disposed on at least one side of the perovskite layer, the passivation layer includes a passivation material, the passivation material includes anions and cations, a volume of the anions is V1, a volume of the cations is V2, and V1>V3>V2, where V3 is a volume of a largest defect in the perovskite layer; and an electrode layer, where the electrode layer is disposed on a side of the passivation layer facing away from the perovskite layer.