Electrochemical Generator Opening in Ionic Liquid for Safe Discharge
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Solution Overview
Problem
The existing methods for recycling lithium-based electrochemical generators, such as batteries, face safety challenges due to the risk of explosions and toxic fume release during the opening process, requiring costly and difficult-to-industrialize conditions like controlled atmospheres and high-temperature treatments.
Innovation Solution
A process involving immersion in an ionic liquid solution with a redox species to safely open electrochemical generators, using an electrically insulating element to prevent short circuits and discharge the batteries, thereby avoiding violent reactions with water and air.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional opening methods are used on charged electrochemical generators, then the opening process can be performed, but explosions and toxic fume release occur due to violent reactions with air and water
Solution Approach 1:
The patent introduces an ionic liquid as an intermediary medium between the electrochemical generator and the external environment. This ionic liquid serves as a mediator that allows safe contact and opening operations without causing violent reactions. The ionic liquid forms a protective interface that prevents direct contact between reactive battery components (metallic lithium, electrolyte) and harmful elements (oxygen, water vapor in air), thereby eliminating explosions and toxic fume release while enabling the opening process to proceed safely.
Solution Approach 2:
The patent creates an inert environment by immersing the electrochemical generator in an ionic liquid, which provides an oxygen-free and water-free atmosphere. This inert environment prevents oxidation reactions and violent reactions with moisture that would otherwise occur when charged batteries are exposed to air. The ionic liquid effectively replaces traditional inert gas atmospheres, providing a liquid medium that suppresses harmful reactions while allowing safe handling and opening operations.
2Reliability
If controlled atmosphere chambers are used to prevent explosions, then safety is improved, but the process becomes costly and difficult to industrialize
Solution Approach 1:
The patent extracts the harmful elements (oxygen, water vapor) from the environment by replacing air with an ionic liquid medium. Instead of using complex controlled atmosphere chambers that require sophisticated gas control systems, the invention simply immerses the battery in ionic liquid, which naturally excludes oxygen and water. This extraction approach eliminates the need for complex atmospheric control equipment while maintaining safety, making the process much simpler and more suitable for industrialization.
Solution Approach 2:
The patent uses a liquid (ionic liquid) instead of gas-based controlled atmosphere systems. By immersing the electrochemical generator in ionic liquid, the invention employs hydraulic principles to create a physical barrier against oxygen and water vapor. This liquid-based approach is inherently simpler than pneumatic control systems, requiring no complex gas flow control, pressure regulation, or sealing mechanisms, thereby reducing device complexity while maintaining safety.
3Reliability
If high-temperature treatments are applied to prevent violent reactions, then safety is improved, but energy consumption increases significantly
Solution Approach 1:
The patent changes the fundamental parameter of the environment from gaseous (air) to liquid (ionic liquid). This parameter change allows the process to proceed at ambient temperature rather than requiring high-temperature treatments. The ionic liquid's physical state and chemical properties enable it to suppress violent reactions at room temperature, eliminating the need for energy-intensive thermal processing while maintaining safety throughout the opening operation.
4Temperature
If water is used to cool and suppress reactions, then the opening process can proceed, but hydrogen gas is generated creating explosion risks
Solution Approach 1:
The patent replaces water as the cooling and protective medium with an ionic liquid. This ionic liquid intermediary performs the cooling function while simultaneously preventing hydrogen generation. Unlike water that reacts with metallic lithium to produce explosive hydrogen gas, the ionic liquid does not contain oxygen or water molecules that would react with lithium. Thus, it provides both cooling and protection against violent reactions without generating harmful hydrogen gas, solving both thermal management and safety concerns.
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
This method ensures safe and efficient opening of electrochemical generators, reducing the risk of explosions and toxic fume release, allowing for secure access to recyclable materials while minimizing energy and water consumption.
Implementation Method 1
immersion of the electrochemical generator in an ionic liquid solution comprising a solvent ionic liquid and, optionally, a so-called oxidizing redox species capable of being reduced on the negative electrode so as to discharge the electrochemical generator
Data Source
Figure 1~2
AI summary
The invention relates to a method for securing an electrochemical generator (10) comprising a negative electrode (20) containing lithium or sodium and a positive electrode (30), the method comprising the following successive steps: (a) immersing an electrochemical generator (10) in an ionic liquid solution (100) containing a solvent ionic liquid and, optionally, a redox species, referred to as the oxidising species, capable of being reduced on the negative electrode so as to discharge the electrochemical generator; (b) opening the electrochemical generator with an electrically insulative element, opening being performed in the ionic liquid solution.