Hygroscopic Material in Lithium Battery Electrode Pores
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Solution Overview
Problem
Lithium secondary batteries face performance degradation due to moisture presence, which is not effectively removed by existing methods, leading to side reactions and reduced battery reliability.
Innovation Solution
Incorporating a hygroscopic material into the active material layer of the electrode, allowing it to be disposed in pores formed by the active material, effectively absorbing and removing moisture from both the electrode and electrolyte.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high-temperature drying process is used to remove moisture from electrode, then moisture removal efficiency is improved, but manufacturing complexity and energy consumption increase
Solution Approach 1:
The hygroscopic material is incorporated into the electrode structure before battery assembly, performing moisture absorption in advance. This preliminary action eliminates the need for complex post-manufacturing drying processes, as the moisture removal function is built into the electrode itself during the coating step.
Solution Approach 2:
The electrode becomes self-service regarding moisture removal through the integrated hygroscopic material. The electrode automatically absorbs and removes moisture from the electrolyte solution during battery operation without requiring external drying equipment or additional manufacturing steps.
2Reliability
If hygroscopic material is added to active material layer, then moisture removal capability is improved, but electrode structure complexity increases
Solution Approach 1:
The hygroscopic material is merged with the active material layer during the coating process, combining moisture removal functionality with the electrode structure. This integration avoids adding separate moisture removal components, maintaining structural simplicity while achieving dual functionality.
Solution Approach 2:
The active material layer is given multi-functionality by incorporating hygroscopic material, allowing it to perform both its primary electrochemical function and moisture absorption. This universal approach eliminates the need for dedicated moisture removal structures.
3Ease of manufacture
If moisture is present in electrolyte solution, then battery assembly is simplified, but side reactions occur reducing battery reliability
Solution Approach 1:
The hygroscopic material converts the harmful presence of moisture into a beneficial process by actively absorbing and removing it during battery operation. Instead of requiring perfect moisture-free assembly, the system uses the moisture-absorbing capability to maintain reliability even when moisture is present during manufacturing.
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 approach enhances battery performance by preventing side reactions caused by moisture, improving capacity retention and overall battery reliability by effectively managing moisture content.
Implementation Method 1
a hygroscopic material for removing microscopic moisture of an electrode
Data Source
AI summary
Provided is an electrode for a lithium secondary battery in which a hygroscopic material is disposed in pores which are formed by arranging an active material in an active material layer, wherein, since the electrode for a lithium secondary battery according to the present invention may remove moisture present in the electrode and an electrolyte solution by disposing the hygroscopic material in the pores which are formed by the active material in the active material layer, a side reaction due to the presence of moisture in the battery may be excluded, and thus, the performance of the battery may be improved.