Crosslinked PEO Solid Electrolyte with Gas-Phase Polar Doping

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Solution Overview

Problem

Conventional polymer solid electrolytes face challenges in achieving high ionic conductivity due to high crystallinity, and adding liquid electrolytes or solvents results in safety issues and insufficient conductivity improvements.

Innovation Solution

A PEO-based copolymer with crosslinkable functional groups forms a three-dimensional network structure, incorporating a polar compound in a gaseous state through vapor deposition, enhancing ionic conductivity without deforming the polymer structure.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the polymer structure is modified to improve chain mobility, then ionic conductivity is enhanced, but the structural integrity and mechanical properties may deteriorate

Engineering Contradiction:
Improveionic conductivityVSAvoidstructural integrity
Core Design Contradiction:
ReliabilityVSStrength

Solution Approach 1:

The patent introduces crosslinkable functional groups at specific locations on the polymer chain (every 2-20 repeating units). This localized modification allows crosslinking in specific regions to maintain structural integrity while leaving other regions flexible for ion transport, thus balancing strength and conductivity

Inventive Principle:
Principle #3Local quality

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 electrolyte achieves improved ionic conductivity and mechanical properties by controlling relaxation time and diffusion of the polar compound within the polymer chains, maintaining structural integrity and preventing liquid leakage.

Implementation Method 1

incorporating a polar compound in a gaseous state through vapor deposition

Methodology Applied
Scientific EffectVapor deposition: Physical Vapour Deposition

Implementation Method 2

tD is a diffusion time of the polar compound within the polymer chains

Methodology Applied
Scientific EffectDiffusion: Diffusion

Implementation Method 3

tR is a relaxation time of the polymer chains

Methodology Applied
Scientific EffectRelaxation: Stress Relaxation

Data Source

PatentUS20260088340A1Polymer solid electrolyte and all solid-state battery comprising the same
Publication Date: 2026.03.26 LG ENERGY SOLUTION LTD
  • US20260088340A1 patent drawing
  • US20260088340A1 patent drawing
  • US20260088340A1 patent drawing

AI summary

The present disclosure relates to an electrolyte and an all solid-state battery comprising the same. The electrolyte includes a PEO(polyethylene oxide)-based copolymer containing crosslinkable functional groups; and a polar compound, wherein at least a portion of the crosslinkable functional groups forms cross-links with each other, and the PEO-based copolymer forms a three-dimensional network structure, and wherein the polar compound in a gaseous state is contained in the three-dimensional network structure, and satisfies predetermined characteristics.