Sulfide Solid Electrolyte Stabilization via CO2 Absorption
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Solution Overview
Problem
Sulfur atoms in sulfide solid electrolytes are extremely unstable, leading to decomposition when in contact with lithium metal, causing interfacial impedance and battery failure, and current solutions involving coating layers increase production complexity and cost.
Innovation Solution
A method involving a sulfide solid electrolyte with a dissociable phosphorous-sulfur structure that absorbs carbon dioxide, forming a sulfur-carbon bond to stabilize the sulfur atoms, using easily accessible and cost-effective carbon dioxide.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a coating layer is applied on the interface between sulfide solid electrolyte and electrodes to isolate them, then the stability of sulfide solid electrolyte is improved, but the production complexity and cost increase
Solution Approach 1:
Carbon dioxide serves as an intermediary substance that reacts with sulfur atoms on the surface of the sulfide solid electrolyte to form a stable protective layer. This mediator approach avoids the need for complex coating layers while achieving the same protective function against lithium metal decomposition
Solution Approach 2:
The invention changes the chemical state of sulfur atoms by introducing carbon dioxide, transforming unstable sulfur atoms into stable sulfur-carbon bonded structures. This parameter change in chemical bonding state provides stability without requiring additional coating materials or complex production processes
2Reliability
If a coating layer is applied on the interface between sulfide solid electrolyte and electrodes to isolate them, then the stability of sulfide solid electrolyte is improved, but the production cost increases
Solution Approach 1:
Carbon dioxide, an abundant and inexpensive gas, is used to stabilize the sulfide solid electrolyte surface. This replaces expensive coating materials with a low-cost, easily accessible substance that achieves the same protective effect
Solution Approach 2:
Carbon dioxide acts as a mediator that forms stable sulfur-carbon bonds on the electrolyte surface, providing a cost-effective alternative to expensive coating layers while maintaining the stability function
3Reliability
If carbon dioxide is absorbed by the sulfide solid electrolyte to stabilize sulfur atoms, then the stability of sulfide solid electrolyte is improved, but the production process complexity increases
Solution Approach 1:
The carbon dioxide absorption process is performed as a preliminary treatment step before battery assembly, stabilizing the sulfide solid electrolyte surface in advance. This preliminary action prevents decomposition during subsequent battery operation without requiring complex in-situ stabilization mechanisms
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 sulfide solid electrolyte remains stable upon contact with lithium metal, maintaining performance through multiple life cycles without decomposition, reducing production complexity and cost while ensuring stable conductivity.
Implementation Method 1
absorbing the carbon dioxide by the sulfide solid electrolyte
Implementation Method 2
a carbon dioxide is attached on the sulfur atom or forms a sulfur-carbon bond thereon
Data Source
AI summary
Present invention is related to a method for stabilizing sulfide solid electrolyte having steps of providing a sulfide solid electrolyte, contacting the sulfide solid electrolyte with carbon dioxide gas, and the sulfide solid electrolyte absorbing the CO2 gas. By introducing cost efficient CO2 gas, the sulfide solid electrolyte could have a more stable molecular structure to avoid degradation during long cycle lifetime.