Plastic Crystal Solid Electrolyte Ion Conductivity

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Solution Overview

Problem

Plastic crystal-type solid electrolytes exhibit low ion conductivity compared to sulfide- and oxide-type solid electrolytes, limiting their performance in power storage devices.

Innovation Solution

Incorporating a combination of two types of cations, including imidazolium and quaternary ammonium cations, and two types of anions, such as amide anions with perfluoroalkyl substitutions, into the plastic crystal structure to enhance ion conductivity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If plastic crystal is used as solid electrolyte, then adhesiveness to electrode and permeation into porous structure are improved, but ion conductivity deteriorates (two to three orders lower than sulfide- and oxide-type)

Engineering Contradiction:

Improveadhesiveness to electrodeVSAvoidion conductivity

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent uses composite materials by combining plastic crystal with sulfide-type or oxide-type solid electrolyte particles to create a composite solid electrolyte layer. This composite structure allows the plastic crystal to provide adhesiveness and permeation while the sulfide/oxide particles contribute high ion conductivity, resolving the contradiction between ease of manufacture and reliability

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent changes the compositional parameters of the solid electrolyte by controlling the content ratio of plastic crystal to sulfide/oxide particles within specific ranges (5-95 wt% plastic crystal). This parameter optimization balances the adhesiveness benefits of plastic crystal with the ion conductivity benefits of sulfide/oxide particles

Inventive Principle:

Principle #35Parameter changes

2Ease of manufacture

If plastic crystal is used as solid electrolyte, then ease of application by dissolution in organic solvent is improved, but ion conductivity deteriorates

Engineering Contradiction:

Improveease of applicationVSAvoidion conductivity

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent creates a composite solid electrolyte combining plastic crystal (easy to apply via dissolution) with sulfide/oxide particles (high ion conductivity). The composite maintains the ease of application advantage while compensating for the ion conductivity deficiency through the high-conductivity particle phase

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent optimizes the composition parameters by controlling the weight percentage of plastic crystal and sulfide/oxide particles, and the thickness of the solid electrolyte layer, to achieve both ease of application and satisfactory ion conductivity

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

Significantly increases the ion conductivity of the solid electrolyte, improving the performance of power storage devices by facilitating the hopping of ions within the crystal lattice.

Implementation Method 1

improving the performance of power storage devices by facilitating the hopping of ions within the crystal lattice

Methodology Applied

Scientific EffectIon hopping:

Data Source

PatentUS20230111774A1Solid electrolyte, electricity storage device and method for producing solid electrolyte

Publication Date: 2023.04.13 NIPPON CHEMI CON CORP

AI summary

Provided are plastic crystal-type solid electrolyte having high ion conductivity and a power storage device using the solid electrolyte. The solid electrolyte contains a plastic crystal doped with an electrolyte. The plastic crystal contains two or more types of cations in total, at least one of which is selected from the group of imidazoliums and quaternary ammoniums.