Integrated Battery Sheet Structure to Suppress Gas Buildup
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Solution Overview
Problem
Aqueous secondary batteries face increased resistance due to gas accumulation between the separator and electrodes, leading to electrolysis and internal short circuits, which are not effectively addressed by existing technologies.
Innovation Solution
An integrated sheet structure comprising a first mixture layer, a second mixture layer, and a third mixture layer with solid particles, where the first and third mixture layers are bonded, and the second and third mixture layers are bonded, reducing liquid accumulation and gas generation, thereby suppressing resistance increases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separator is used between electrodes in an aqueous secondary battery, then ion conduction is enabled, but gas generated by side reaction accumulates between the separator and electrode, causing resistance increase
Solution Approach 1:
The patent employs a porous separator with controlled pore structure to enable ion conduction while preventing gas accumulation. The porous material allows electrolyte penetration and ion transport but captures gas bubbles within its three-dimensional network, preventing them from forming continuous pathways that would cause resistance increase.
Solution Approach 2:
The separator acts as an intermediary layer between the electrodes, mediating the interaction between electrolyte, electrodes, and generated gas. It provides a physical interface that facilitates ion conduction while simultaneously trapping and neutralizing the harmful effect of gas accumulation through its porous structure.
2Use of energy by moving object
If non-aqueous electrolyte is used, then energy density is improved, but safety measures are needed due to combustibility
Solution Approach 1:
The patent employs an aqueous electrolyte environment that inherently provides safety through its non-combustible nature, replacing the combustible non-aqueous electrolyte. The aqueous environment acts as an inert medium from a fire safety perspective, eliminating the need for additional safety measures while maintaining functional performance.
Solution Approach 2:
The invention changes the fundamental parameter of electrolyte composition from non-aqueous to aqueous, fundamentally altering the safety characteristics of the battery system. This parameter change transitions the electrolyte from combustible to non-combustible, addressing the safety concern while the patent optimizes other parameters to maintain energy density.
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 integrated sheet structure effectively reduces gas generation and electrolysis, leading to improved peeling strength and coulombic efficiency, thus enhancing the performance and reliability of secondary batteries.
Implementation Method 1
a third mixture layer located between the first mixture layer and the second mixture layer and containing solid particles and a third binder, in which the first mixture layer and the third mixture layer are bonded each other, and the second mixture layer and the third mixture layer are bonded each other
Implementation Method 2
a gas generated by side reaction is accumulated between a separator and an electrode, and ion conduction does not occur at this portion. Therefore, resistance as the secondary battery increases
Data Source
AI summary
An integrated sheet structure for a secondary battery, including a first mixture layer containing a first active material and a first binder, a second mixture layer containing a second active material and a second binder, and a third mixture layer located between the first mixture layer and the second mixture layer and containing solid particles and a third binder, in which the first mixture layer and the third mixture layer are bonded each other, and the second mixture layer and the third mixture layer are bonded each other.