Aromatic Non-Fluorine Binder for Fluoride Ion Battery Anode
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Solution Overview
Problem
In fluoride ion batteries, the use of fluorine-based binders like PVDF leads to reductive decomposition, affecting the anode active material's adhesion and causing capacity decrease and cycle deterioration due to direct reaction with fluoride ions.
Innovation Solution
An anode layer comprising an anode active material and a non-fluorine-based binder with aromaticity, such as polyimide resin, is used to prevent binder decomposition, ensuring stability and adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fluorine-based binder such as PVDF is used in the anode layer, then the binder provides good adhesion and binding properties, but the fluorine in the binder undergoes reductive decomposition due to reaction with fluoride ions, leading to capacity decrease and cycle deterioration
Solution Approach 1:
The patent removes fluorine atoms from the binder molecule, extracting the harmful element that causes reductive decomposition. The binder is changed from a fluorine-based polymer (PVDF) to a non-fluorine-based polymer without compromising its binding function, thereby eliminating the source of the problem while maintaining adhesion properties
Solution Approach 2:
The patent changes the chemical composition parameter of the binder by selecting a non-fluorine-based polymer with aromaticity. This parameter change (removing fluorine atoms) fundamentally alters the binder's chemical stability toward fluoride ions, preventing reductive decomposition while maintaining the necessary binding functionality through aromatic structural characteristics
2Duration of action of stationary object
If a non-fluorine-based binder with aromaticity is used, then decomposition of the binder is restrained and durability is improved, but the binder structure becomes more complex requiring specific aromatic groups
Solution Approach 1:
The patent applies local quality by introducing aromatic groups (such as phenylene groups) at specific locations within the binder polymer chain. These aromatic segments provide the necessary stability against fluoride ion attack and prevent reductive decomposition, while the rest of the polymer structure maintains simple chain connectivity and binding functionality, thus achieving durability improvement without excessive overall complexity
Solution Approach 2:
The patent creates a composite binder structure combining aromatic moieties (for stability) with aliphatic linkers or side chains (for flexibility and binding). This composite approach integrates the beneficial properties of aromatic structures (resistance to reductive decomposition) with the advantageous properties of simpler polymer chains (processability and adhesion), achieving durability enhancement without prohibitively complex structure
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 non-fluorine-based binder with aromaticity effectively restrains decomposition, enhancing the durability and cycle stability of fluoride ion batteries by preventing reductive decomposition and maintaining adhesion of the anode active material.
Implementation Method 1
the anode active material affects the fluorine contained in the fluorine-based binder and easily brings decomposition of the binder (reductive decomposition)
Data Source
AI summary
An object of the present disclosure is to provide an anode layer for a fluoride ion battery in which decomposition of a binder is restrained. The present disclosure attains the object by providing an anode layer to be used for a fluoride ion battery, the anode layer comprising an anode active material and a non-fluorine-based binder having aromaticity.