Fluoride Ion Battery Anode Material Composition
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Solution Overview
Problem
The reduction decomposition of the solid electrolyte during charge in fluoride ion batteries, which can lead to short circuits due to the close charge potential of LaF3 and the reduction potential of the Tysonite structured solid electrolyte, is a significant challenge.
Innovation Solution
Incorporating a Sn element into the anode active material composition La(1-x)SnxF(3-x), where 0.1≤x≤0.8, to elevate the charge potential above the reduction potential of the solid electrolyte, thereby inhibiting its reduction decomposition during charging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If LaF3 is used as anode active material to improve fluoride ion conductivity and reversibility, then battery performance is improved, but reduction decomposition of solid electrolyte occurs during charge due to close charge potential
Solution Approach 1:
The patent modifies the chemical composition parameters of the anode active material by incorporating Sn element into LaF3 to form La(1-x)SnxF(3-x). This compositional parameter change shifts the charge potential to a higher value, creating sufficient potential difference from the solid electrolyte's reduction potential and preventing reduction decomposition during charging.
Solution Approach 2:
The patent creates a composite anode active material by combining LaF3 with Sn element to form La(1-x)SnxF(3-x). This composite material integrates the advantages of both components while achieving a charge potential that is sufficiently higher than the solid electrolyte's reduction potential, thereby preventing harmful reduction decomposition.
2Stability of the object's composition
If charge potential of anode active material is close to reduction potential of solid electrolyte, then fluorination and defluorination reversibility is achieved, but short circuit occurs due to reduction decomposition
Solution Approach 1:
The patent adjusts the charge potential parameter by modifying the anode active material composition to La(1-x)SnxF(3-x). This parameter change ensures the charge potential is sufficiently higher than the solid electrolyte's reduction potential, maintaining compositional stability during fluorination and defluorination while preventing short circuits through reduction decomposition.
3Reliability
If Sn element is added to LaF3 to elevate charge potential, then reduction decomposition is inhibited, but composition complexity increases
Solution Approach 1:
The patent applies a controlled parameter change by adding Sn element to LaF3 within a specific compositional range (La(1-x)SnxF(3-x))). This approach elevates the charge potential to inhibit reduction decomposition while maintaining manageable composition complexity through defined stoichiometric relationships and controlled element ratios.
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 approach effectively prevents the reduction decomposition of the solid electrolyte, enhancing the discharge capacity and cycle properties of the fluoride ion battery while maintaining stable operation and preventing short circuits.
Implementation Method 1
the charge potential (defluorination potential) of LaF3 is extremely close to the reduction potential (defluorination potential) of the above described solid electrolyte
Implementation Method 2
a solid electrolyte having a crystal phase of a Tysonite structure (such as La0.9Ba0.1F2.9) has advantages such as excellent fluoride ion conductivity
Implementation Method 3
an electrochemical cell (fluoride ion battery) provided with a cathode, an anode, and an electrolyte that can conduct an anion charge carrier (F−)
Data Source
AI summary
A main object of the present disclosure is to provide a fluoride ion battery in which reduction decomposition of a solid electrolyte is inhibited. The present disclosure achieves the object by providing a fluoride ion battery, comprising a cathode layer, an anode layer, and a solid electrolyte layer formed between the cathode layer and the anode layer; wherein the anode layer contains an anode active material having a composition represented by La(1-x)SnxF(3-x), in which 0.1≤x≤0.8; and the solid electrolyte layer contains a solid electrolyte including a crystal phase of a Tysonite structure.