Fluorinated Polyphosphonate Polymer Electrolyte for Lithium Batteries

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Solution Overview

Problem

Traditional liquid electrolyte-based lithium-ion batteries have limitations such as short lifespans, limited energy density, and safety risks, while polymer electrolytes offer advantages like superior energy density and safety but face challenges like temperature-dependent ion conductivity and low stability under oxidizing conditions.

Innovation Solution

Development of fluorinated polyphosphonate polymer electrolytes with specific structures, such as —CF3 and —(CF2)nCF3, combined with metal salts like lithium triflate, to enhance ionic conductivity and stability, used in solid-state batteries where the polymer serves as both electrolyte and separator.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If traditional liquid electrolytes are used in lithium-ion batteries, then ionic conductivity is achieved, but safety risks increase and lifespan is limited

Engineering Contradiction:

Improvebattery safetyVSAvoidsafety risks

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent changes the physical state parameter of the electrolyte from liquid to solid polymer form, fundamentally altering the system's safety profile while maintaining ionic conductivity through polymer chain segmental motion

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses composite polymer electrolyte materials combining multiple polymer components and lithium salts to achieve both safety improvements and maintained ionic conductivity, creating a material system that balances competing requirements

Inventive Principle:

Principle #40Composite materials

2Reliability

If polymer electrolytes are used to replace liquid electrolytes, then safety and energy density are improved, but ion conductivity becomes temperature-dependent and stability under oxidizing conditions decreases

Engineering Contradiction:

Improvebattery safetyVSAvoidstability under oxidizing conditions

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The patent modifies the chemical composition parameters of the polymer electrolyte by incorporating specific lithium salts and polymer matrices that enhance oxidation stability while maintaining ion conductivity across temperature ranges

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates localized regions within the polymer electrolyte with different chemical properties, using specific functional groups and additive packages that provide oxidation resistance at critical interfaces while maintaining bulk ionic conductivity

Inventive Principle:

Principle #3Local quality

3Volume of stationary object

If polymer electrolytes are used in lithium batteries, then volumetric energy density is improved, but manufacturing complexity and material stability challenges increase

Engineering Contradiction:

Improvevolumetric energy densityVSAvoidmanufacturing complexity

Core Design Contradiction:

Volume of stationary objectVSEase of manufacture

Solution Approach 1:

The patent divides the polymer electrolyte system into distinct functional components (polymer matrix, lithium salt, additives) that can be separately optimized and then combined, simplifying the manufacturing process while achieving high volumetric energy density

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent develops polymer electrolyte formulations that serve multiple functions simultaneously: ion conduction, separation, and structural support, reducing the number of separate components needed and simplifying battery assembly

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 fluorinated polyphosphonate polymer electrolytes demonstrate improved ionic conductivity, stability at high voltages, and enhanced safety, overcoming limitations of traditional polymer electrolytes like poly(ethylene oxide), with potential for higher energy density and safer lithium-ion batteries.

Implementation Method 1

The fluorinated polyphosphonate polymer electrolytes demonstrate improved ionic conductivity

Methodology Applied

Scientific EffectIonic conductivity: Conduction (electrical)

Data Source

PatentUS11289736B2Polymer electrolyte material for lithium battery cells

Publication Date: 2022.03.29 ROBERT BOSCH GMBH

AI summary

Lithium battery electrolyte materials comprising fluorinated phosphonates and having a polymer structure defined by:where R1 is —CF3, —(CF2)nCF3 and n is an integer ranging from 1 to 10, perfluoropolyether (PFPE), polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), fluorinated ethylene propylene (FEP), ethylene fluorinated ethylene propylene (EFEP), or polyethylene tetrafluoroethylene (ETFE) and R2 is —(CF2)n and n is an integer ranging from 1 to 10, perfluoropolyether (PFPE), polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), fluorinated ethylene propylene (FEP), ethylene fluorinated ethylene propylene (EFEP), or polyethylene tetrafluoroethylene (ETFE).