Positive Electrode Termination Tape for High-Temperature Li-Ion Batteries
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Solution Overview
Problem
Lithium-ion batteries face safety hazards due to high-temperature deformations and warping of termination tapes, leading to short-circuits and potential fires or explosions, necessitating improved high-temperature safety performance.
Innovation Solution
A battery design with a termination tape on the positive electrode plate, featuring a specific area-to-width ratio and a (meth)acrylic acid termination adhesive layer, combined with a non-aqueous electrolyte solution of controlled lithium salt concentration, to minimize deformation and warping risks and enhance high-temperature stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a termination tape is used on the positive electrode plate, then the adhesive layer can maintain integrity at high temperatures, but the termination tape may deform and warp causing short-circuits
Solution Approach 1:
The patent applies parameter changes by optimizing the area ratio of the termination tape (A/C ratio between 1-3) and controlling the lithium salt concentration (B1 mol/L) in the electrolyte solution. These parameter adjustments ensure the termination tape maintains adequate adhesive coverage without excessive size that would cause deformation and warping at high temperatures.
2Area of stationary object
If the termination tape area is increased to prevent short-circuits, then coverage is improved, but deformation and warping at high temperatures worsen
Solution Approach 1:
The patent resolves this contradiction by establishing an optimal area ratio parameter (A/C between 1-3) for the termination tape. This parameter optimization ensures sufficient coverage area while preventing excessive size that would lead to deformation and warping at high temperatures, thus maintaining structural stability.
3Use of energy by moving object
If lithium salt concentration is increased to improve high-voltage performance, then energy density improves, but high-temperature safety performance deteriorates
Solution Approach 1:
The patent applies parameter changes by optimizing the lithium salt concentration (B1 mol/L) in the electrolyte solution to achieve an optimal balance. This parameter adjustment ensures adequate energy density while maintaining high-temperature safety performance, resolving the trade-off between these two critical parameters.
Data Source
AI summary
Disclosed is a battery. The battery includes a positive electrode plate, a negative electrode plate, a non-aqueous electrolyte solution, and a separator. The non-aqueous electrolyte solution includes a non-aqueous organic solvent and a lithium salt. A termination tape of the positive electrode plate is disposed at a paste coating tail of the positive electrode plate. An area of a termination tape of the positive electrode plate is A cm2; a content of the lithium salt is B1 mol/L; and a width of the positive electrode plate is C cm; wherein a ratio of A to B1 is in a range of 2-20, and a ratio of A to C is in a range of 1 to 3. The termination tape includes a substrate and a (meth)acrylic acid termination adhesive layer coated on a surface of the substrate. The battery can effectively improve high-temperature performance.