PTMC Solid Electrolyte Composition for Higher Ionic Conductivity

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Solution Overview

Problem

Conventional solid polymer electrolytes in lithium batteries exhibit low ionic conductivity, limiting the performance of lithium batteries, and there is a need for a polymer electrolyte with high ionic conductivity, safety, and chemical stability for use in all-solid-state lithium batteries.

Innovation Solution

A specific combination of a lithium salt, lithium N-(1-naphthalenesulfonyl)trifluoromethylsulfonamide (LiNPTFSI), and a polymer with a repeating motif of poly(trimethylene carbonate) (PTMC) is used, with a molar ratio between 1/2 and 1/40, to enhance ionic conductivity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If conventional polymer electrolyte compositions are used, then ease of manufacture is maintained, but ionic conductivity deteriorates

Engineering Contradiction:

Improveease of manufactureVSAvoidionic conductivity

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent modifies the compositional parameters of conventional polymer electrolytes by adding specific ratios of LiTFSI (0.5-2.0 mmol per gram of polymer) and cyclic carbonate (0.1-1.0 mmol per gram of polymer). These parameter changes enhance ionic conductivity while maintaining compatibility with existing manufacturing processes for solid polymer electrolytes.

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 electrolyte achieves an ionic conductivity of 1.9 x 10⁻² mS·cm⁻¹ at 80°C, which is about three times greater than conventional compositions, providing high performance and stability for lithium batteries.

Implementation Method 1

The conduction of Li+ ions within the polymer can occur via two concurrent mechanisms: diffusion of ions under the influence of a concentration gradient

Methodology Applied

Scientific EffectDiffusion: Diffusion

Implementation Method 2

complexation of Li+ ions assisted by the segmental mobility of the polymer chains

Methodology Applied

Scientific EffectComplexation:

Implementation Method 3

complexation of Li+ ions assisted by the segmental mobility of the polymer chains

Methodology Applied

Scientific EffectSegmental mobility:

Data Source

PatentEP4648160A1Solid electrolyte for lithium battery

Publication Date: 2025.11.12 COMMISSARIAT A LENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES

AI summary

The invention relates to a solid lithium battery electrolyte, comprising a polymer from the poly(alkylene carbonate) family and a lithium salt of formula (III):