Amphiphilic Surface-Modified Solid Electrolyte for Moisture Shielding
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Solution Overview
Problem
Sulfide-containing solid electrolytes for all-solid-state batteries are sensitive to moisture, leading to issues such as the generation of toxic gases and the need for a very dry manufacturing environment.
Innovation Solution
A solid electrolyte for all-solid-state batteries is surface-modified with an amphiphilic compound having a hydrophilic group and a hydrophobic group, chemically bonding the hydrophilic group to the sulfide-containing electrolyte surface to protect it from moisture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sulfide-containing solid electrolyte is used to achieve high ionic conductivity and thermal stability, then ionic conductivity is improved, but moisture sensitivity worsens leading to toxic gas generation
Solution Approach 1:
An amphiphilic compound is introduced as an intermediary layer between the sulfide-containing solid electrolyte and the external environment. The hydrophilic group of the amphiphilic compound faces the electrolyte while the hydrophobic group faces outward, creating a protective interface that repels moisture and prevents direct contact between water and the sulfide electrolyte, thereby eliminating toxic gas generation while preserving ionic conductivity
Solution Approach 2:
The surface properties of the solid electrolyte are locally modified by introducing amphiphilic compounds with distinct hydrophilic and hydrophobic regions. The hydrophilic portion interacts with the electrolyte surface while the hydrophobic portion creates a moisture-resistant outer layer, creating a gradient structure that provides protection only where needed without affecting the bulk electrolyte properties
2Reliability
If sulfide-containing solid electrolyte is used to achieve high ionic conductivity, then energy density is improved, but manufacturing complexity worsens due to requirement of very dry environment
Solution Approach 1:
The amphiphilic compound is pre-applied to the surface of the sulfide-containing solid electrolyte before battery assembly and manufacturing processes. This preliminary protective coating is established in advance, allowing subsequent manufacturing steps to proceed in normal atmospheric conditions without requiring specialized dry environments, thereby simplifying manufacturing complexity while preserving the high ionic conductivity of the electrolyte
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 modified electrolyte effectively shields the sulfide-containing electrolyte from moisture, maintaining ionic conductivity and structural stability, thereby enhancing battery safety and performance.
Implementation Method 1
chemically bonding the hydrophilic group to the sulfide-containing electrolyte surface
Implementation Method 2
amphiphilic compound having a hydrophilic group and a hydrophobic group
Data Source
AI summary
Disclosed is a solid electrolyte for a solid-state battery, preferably an all-solid-state battery, which may be protected from moisture by chemically reacting a material such as an amphiphilic compound, e.g., a surfactant with a sulfide-containing solid electrolyte, as well as a -solid-state battery comprising the solid electrolyte. The solid electrolyte for the all-solid-state battery is surface-modified with an amphiphilic compound having a hydrophilic group and a hydrophobic group.