Mg Anode Material With Fluoride Conductor for Stable Battery Voltage
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In fluoride ion batteries, the use of specific metal elements in the solid electrolyte or anode current collector prevents short circuits but leads to a decrease in operating voltage due to the shift in anode active material reaction potential to noble values.
Innovation Solution
An anode material comprising a Mg element and a fluoride ion conductive material with metal elements other than Mg, such as Ca, Ba, and La, is used to prevent voltage decrease and short circuit occurrence, with the fluoride ion conductive material functioning as an anode active material during charge and discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If specific metal elements (Pb, Sn, In, Bi, Sb) are used in the solid electrolyte layer or anode current collector to prevent short circuit, then reliability is improved, but operating voltage decreases due to shift in anode active material reaction potential to noble values
Solution Approach 1:
The patent introduces a fluoride ion conductive material as an intermediary substance in the anode active material layer. This material has high fluoride ion conductivity and acts as a mediator that enables electron transfer while preventing direct contact between the anode active material and the solid electrolyte layer, thereby preventing short circuits without shifting the reaction potential to noble values. The fluoride ion conductive material serves as a functional interface that decouples the short circuit prevention function from the voltage-affecting metal elements.
Solution Approach 2:
The patent changes the chemical composition parameters of the anode active material by incorporating fluoride ion conductive materials with specific properties (high fluoride ion conductivity, appropriate electrochemical stability). This parameter change allows the system to achieve short circuit prevention through ionic conductivity control rather than relying on metal elements that would cause potential shift. The composition is optimized to maintain the original reaction potential while providing the necessary protective function.
2Ease of manufacture
If anode active material is self-formed from solid electrolyte utilizing defluorination reaction, then ease of manufacture is improved, but operating voltage decreases due to noble potential shift
Solution Approach 1:
The patent extracts the fluoride ion conductive material from the solid electrolyte layer and places it specifically in the anode active material layer. This extraction allows the solid electrolyte to maintain its original composition and defluorination reaction properties for ease of manufacture, while the separated fluoride ion conductive material in the anode layer provides the necessary protective function without causing the harmful potential shift that would occur if metal elements were added to the solid electrolyte.
Solution Approach 2:
The patent segments the battery structure by creating a distinct anode active material layer containing fluoride ion conductive material, separate from the solid electrolyte layer. This segmentation allows independent optimization of each layer: the solid electrolyte can be manufactured through simple defluorination reactions, while the anode active material layer incorporates the fluoride ion conductive material to prevent short circuits without affecting the solid electrolyte composition or causing noble potential shift.
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 proposed anode material effectively inhibits the decrease in operating voltage and prevents short circuits by shifting the defluorination potential of the fluoride ion conductive material to the noble potential side, maintaining a stable voltage and ensuring efficient battery operation.
Implementation Method 1
a fluoride ion conductive material containing at least one kind of metal element excluding a Mg element, and a F element
Implementation Method 2
utilizing defluorination reaction of the solid electrolyte
Data Source
AI summary
A main object of the present disclosure is to provide an anode material that is used in a fluoride ion battery and can prevent the decrease in operating voltage while inhibiting occurrence of short circuit. The present disclosure achieves the object by providing an anode material to be used in a fluoride ion battery, the anode material comprising a Mg material containing a Mg element, and a fluoride ion conductive material containing at least one kind of metal element excluding a Mg element, and a F element.