Phosphorus-Fluorine Polymer Electrolyte for Stable High-Voltage Cells

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Solution Overview

Problem

Lithium secondary batteries face challenges in achieving high flame retardancy, ionic conductivity, and high-voltage stability due to limitations in existing polymer electrolytes, which can lead to safety issues and reduced performance.

Innovation Solution

A polymer electrolyte composition comprising a fluorine-based solvent, a lithium salt, and a flame retardant polymer containing phosphorus and fluorine, with specific weight percentages of fluorine, phosphorus, and oxygen, enhancing flame retardancy and ionic conductivity while forming a stable electrode-electrolyte interface.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional polymer electrolytes are used, then the battery structure is simple, but flame retardancy is insufficient leading to safety issues

Engineering Contradiction:

Improveflame retardancyVSAvoidelectrolyte composition complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent employs composite materials by combining fluorinated phosphorus-containing polymer compounds with conventional polymer electrolyte matrices. This composite approach integrates the flame-retardant properties of phosphorus-containing compounds with the ionic conductivity of fluorinated polymers, achieving both safety and performance requirements simultaneously

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent modifies the chemical composition parameters of the polymer electrolyte by incorporating specific fluorinated phosphorus-containing compounds at controlled concentrations. This parameter change introduces flame retardancy while maintaining ionic conductivity through optimized compositional ratios

Inventive Principle:

Principle #35Parameter changes

2Reliability

If flame retardant additives are added to polymer electrolytes, then flame retardancy improves, but ionic conductivity decreases

Engineering Contradiction:

Improveflame retardancyVSAvoidionic conductivity

Core Design Contradiction:

ReliabilityVSPower

Solution Approach 1:

The patent optimizes the concentration parameters of fluorinated phosphorus-containing compounds within specific ranges to balance flame retardancy and ionic conductivity. By controlling the amount of additive, the patent achieves sufficient flame protection while minimizing negative impacts on ion transport

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent introduces localized flame-retardant functional groups through fluorinated phosphorus-containing compounds that specifically target flame suppression zones without broadly affecting the bulk electrolyte's ionic conductivity. The flame-retardant properties are concentrated where needed while preserving overall electrolyte performance

Inventive Principle:

Principle #3Local quality

3Reliability

If high fluorine content polymer electrolyte is used, then high-voltage stability improves, but manufacturing complexity increases

Engineering Contradiction:

Improvehigh-voltage stabilityVSAvoidmanufacturing ease

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent combines fluorinated phosphorus-containing compounds with conventional polymer electrolytes to achieve high-voltage stability without requiring complete reformulation of the entire electrolyte system. This composite approach maintains compatibility with existing manufacturing processes while introducing enhanced voltage stability

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent adjusts the fluorine content and phosphorus-containing compound concentration within optimized parameter ranges to achieve high-voltage stability. These controlled parameter changes enable performance improvement while maintaining feasibility in existing manufacturing frameworks

Inventive Principle:

Principle #35Parameter changes

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 electrolyte composition significantly improves flame retardancy, ionic conductivity, and high-voltage stability, reducing the risk of safety hazards and enhancing the overall performance of lithium secondary batteries.

Implementation Method 1

improving flame retardancy and ionic conductivity while forming a stable electrode-electrolyte interface

Methodology Applied

Scientific EffectElectrochemical reaction:

Implementation Method 2

compounds containing fluorine and phosphorus... providing excellent flame retardancy

Methodology Applied

Scientific EffectThermal decomposition: Thermolysis

Implementation Method 3

a fluorine-based solvent; a lithium salt... improving ionic conductivity

Methodology Applied

Scientific EffectDissociation:

Data Source

PatentUS12148891B2Polymer electrolyte for lithium secondary battery and lithium secondary battery including the same

Publication Date: 2024.11.19 SK ON CO LTD

AI summary

A polymer electrolyte for a lithium secondary battery that may include: a fluorine-based solvent; a lithium salt; and a flame retardant polymer containing phosphorus and fluorine, wherein the polymer electrolyte has a fluorine content of 35 to 60% by weight and a phosphorus content of 2.3 to 7.5% by weight. Lithium secondary batteries containing the polymer electrolyte exhibit improved flame retardancy and ionic conductivity as well as enhanced high-voltage stability.