Fluorine Polymer Electrolyte for Battery Cycle Stability
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Solution Overview
Problem
Current secondary batteries face challenges in achieving superior battery characteristics, particularly in terms of energy density and cycle stability, due to frequent charging and discharging demands in electronic devices and other applications.
Innovation Solution
The implementation of a secondary battery configuration that includes a cathode, an anode, and one or both polymer compound layers containing fluorine and conductive materials, which are disposed between the cathode and anode to enhance electrical conductivity and adhesibility, thereby improving battery performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional polymer solid electrolyte is used, then battery assembly is simple, but ionic conductivity is insufficient
Solution Approach 1:
The patent uses composite materials by combining polymer compounds containing fluorine with conductive materials (such as carbon black, acetylene black, or metal particles) to create polymer compound layers that simultaneously provide ionic conductivity and electrical conductivity. This composite approach resolves the contradiction by achieving high ionic conductivity without requiring complex electrolyte structures.
Solution Approach 2:
The patent changes the chemical composition parameters of the polymer electrolyte by incorporating fluorine-containing polymer compounds (such as polyvinylidene fluoride or its copolymers) which have superior ionic conductivity compared to conventional polymers. This parameter change enables high ionic conductivity while maintaining a relatively simple single-layer or dual-layer structure.
2Quantity of substance
If separator is made thinner to reduce battery size, then energy density increases, but mechanical strength and safety decrease
Solution Approach 1:
The patent employs composite materials in the polymer compound layers that provide both mechanical reinforcement and functional properties. The conductive materials dispersed in the fluorine-containing polymer matrix create a structurally robust layer that can serve as a thin yet mechanically strong separator, enabling reduced battery size while maintaining safety and structural integrity.
Solution Approach 2:
The patent applies local quality by creating distinct polymer compound layers with specific properties at different locations between the electrodes. These layers are designed with optimized composition and thickness to provide localized mechanical support and ionic conductivity, allowing the separator to be thinner overall while maintaining strength where needed.
3Quantity of substance
If battery is designed for high energy density, then capacity increases, but cycle stability deteriorates due to frequent charging and discharging
Solution Approach 1:
The patent changes the chemical composition parameters by using fluorine-containing polymer compounds which have superior electrochemical stability and resistance to degradation during repeated charge-discharge cycles. This compositional change enables the battery to maintain high capacity while achieving excellent cycle stability, as the fluorine-containing polymers resist decomposition even at high voltages and temperatures.
Solution Approach 2:
The fluorine-containing polymer compounds create a chemically inert environment within the electrolyte layer that protects the electrode materials from degradation during frequent charging and discharging. This inert chemical environment reduces side reactions and material decomposition, thereby maintaining high battery capacity and cycle stability over extended periods.
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 configuration leads to improved battery characteristics, including higher energy density, reduced capacity decline during repeated charge and discharge cycles, and enhanced stability, especially in severe environments.
Implementation Method 1
One or both of the first polymer compound layer and the second polymer compound layer contain a polymer compound containing fluorine (F) as a constituent element and a conductive material dispersed in the polymer compound
Implementation Method 2
In order to improve, for example, ionic conductivity of a polymer solid electrolyte, a vinylidene fluoride-based copolymer is used as a polymer matrix
Data Source
AI summary
A secondary battery includes a cathode; an anode; and (1) a first polymer compound layer disposed between the cathode and the anode and being adjacent to the cathode, (2) a second polymer compound layer disposed between the cathode and the anode and being adjacent to the anode, or (3) the first polymer compound layer and the second polymer compound layer. One or both of the first polymer compound layer and the second polymer compound layer contain a polymer compound containing fluorine (F) as a constituent element and a conductive material dispersed in the polymer compound.