Localized Polymer Electrolyte for Cracked Electrode Safety
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Solution Overview
Problem
Existing electrochemical cells face safety issues under extreme conditions, such as short circuits, leading to exothermic reactions and potential fire or rupture, due to the exposure of freshly cracked electrode materials to electrolyte.
Innovation Solution
A polymer electrolyte is localized on the surface of the electrode, formed from a mixture containing an electrolyte salt, solvent, and monomer, which upon polymerization, reduces exposure of the electrode to the solvent upon cracking, thereby inhibiting exothermic reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional electrolyte system is used, then electrochemical performance is achieved, but safety deteriorates under extreme conditions due to exothermic reactions when electrode cracks
Solution Approach 1:
A polymer layer is introduced as an intermediary substance between the electrode and the conventional electrolyte. This polymer layer acts as a mediator that physically separates the electrode from the electrolyte solvent, preventing direct contact and thus inhibiting exothermic reactions while still allowing the cell to function under normal conditions
Solution Approach 2:
The polymer layer is applied to the electrode surface in advance before any cracking occurs. This preliminary protective layer is designed to counteract the harmful effect of electrode cracking by already being in place to prevent electrolyte contact with freshly exposed electrode material, thereby preventing exothermic reactions before they can initiate
2Reliability
If polymer is localized on electrode surface, then safety is improved by reducing exposure to solvent, but device complexity increases
Solution Approach 1:
Instead of uniformly modifying the entire electrolyte system, the polymer is selectively localized only on the electrode surface where it is most needed for safety. This local application provides protective functionality at the critical interface between electrode and electrolyte, while the bulk electrolyte composition remains relatively simple and unchanged
Solution Approach 2:
The polymer layer is pre-applied to the electrode surface during the manufacturing process, creating a ready-made protective barrier before the cell is assembled and put into service. This preliminary action ensures safety functionality is built-in from the start, avoiding the need for complex operational control systems
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
Enhances cell safety performance by reducing the maximum temperature and current during external short circuit tests, indicating improved safety profiles without compromising electrochemical performance.
Implementation Method 1
a polymer polymerized from a mixture containing the electrolyte salt, the solvent, and a monomer
Data Source
AI summary
Disclosed is an electrochemical cell having a polymer solid electrolyte comprising a polymer localized on surface of an electrode. In one aspect, the localized polymer physically decreases or prevents exposure of freshly cracked electrode to a flammable solvent under extreme conditions, thus leading to an improved safety profile of the cell. In one aspect, the disclosure provides a polymer solid electrolyte comprising a polymer localized on surface of an electrode. Methods for preparing the same are also disclosed.