Solid Polymer Electrolyte Composition with Multi-Segment Crosslinking

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Solution Overview

Problem

Solid polymer electrolytes in lithium batteries face challenges with low conductivity and high interface resistance, limiting their performance in secondary batteries.

Innovation Solution

A solid polymer electrolyte composition is developed, comprising a crosslinking polymer with segments including a polyalkylene oxide or polysiloxane backbone, urea/urethane linkages, a silane domain, and a phenylene structure, along with a lithium salt and an additive like TiO2 particles, to enhance ionic conductivity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If crosslinking polymer with multiple functional segments is synthesized, then ionic conductivity is improved, but manufacturing complexity increases

Engineering Contradiction:

Improveionic conductivityVSAvoidmanufacturing complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies preliminary action by pre-synthesizing the crosslinking polymer with all necessary functional segments (polyalkylene oxide or polysiloxane backbone, urea/urethane linkages, and silane domains) before final assembly. The polymerization and crosslinking reactions are performed in advance to create the complex multi-segment structure, which is then combined with lithium salt and additive. This preliminary synthesis of the complex polymer structure simplifies the final manufacturing process while achieving high ionic conductivity

Inventive Principle:

Principle #10Preliminary action

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 composition achieves improved ionic conductivity, mechanical strength, and thermal stability, optimizing battery performance and reducing leakage issues by increasing conductivity to 3.1×10−4 S/cm at 30°C.

Implementation Method 1

The first segment may include a polyalkylene oxide backbone and/or a polysiloxane backbone

Methodology Applied

Scientific EffectIon coordination and transport: Conduction (electrical)

Implementation Method 2

The third segment may include a silane domain

Methodology Applied

Scientific EffectHydrolysis: Hydrolysis

Implementation Method 3

The third segment may include a silane domain

Methodology Applied

Scientific EffectCondensation: Condensation

Implementation Method 4

The second segment may include a urea linkage and/or a urethane linkage

Methodology Applied

Scientific EffectHydrogen bonding:

Implementation Method 5

an additive like TiO2 particles, to enhance ionic conductivity

Methodology Applied

Scientific EffectInterfacial conduction: Conduction (electrical)

Data Source

PatentUS9136561B2Solid polymer electrolyte composition and method of synthesizing the same

Publication Date: 2015.09.15 IND TECH RES INST

AI summary

A solid polymer electrolyte composition having good conductivity and better mechanical strength is provided. The solid polymer electrolyte composition includes at least one lithium salt and a crosslinking polymer containing at least a first segment, a second segment, a third segment, and a fourth segment. The first segment includes polyalkylene oxide and/or polysiloxane backbone. The second segment includes urea and/or urethane linkages. The third segment includes silane domain. The fourth segment includes phenylene structure. Moreover, the solid polymer electrolyte composition further includes an additive for improving ionic conductivity thereof.