Li-Ion Battery Termination Tape and Electrolyte for High-Temperature Safety
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Solution Overview
Problem
Lithium-ion batteries face safety hazards due to poor high-temperature safety performance, leading to potential fires or explosions from deformation and warping of termination tapes at high voltage and temperature.
Innovation Solution
A battery design with a positive electrode plate, a non-aqueous electrolyte solution, and a separator, featuring a termination tape with a specific area-to-width ratio and a cross-linked modified rubber adhesive layer, along with an electrolyte additive like lithium difluoro(oxalato)borate, to enhance high-temperature safety and prevent short-circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the termination tape area is increased to prevent short-circuits and deformation, then high-temperature safety performance is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent applies parameter changes by precisely controlling the termination tape area within 1-3 cm² and adjusting the adhesive layer thickness to 5-20 μm. These specific parameter ranges optimize the balance between safety performance and manufacturing simplicity, preventing both short-circuits and deformation without excessive complexity
Solution Approach 2:
The patent uses composite materials by formulating a specific adhesive composition including polyvinylidene fluoride, carboxymethyl cellulose, and styrene-butadiene rubber in defined weight ratios. This composite adhesive layer provides enhanced thermal stability and adhesion strength, improving high-temperature safety while maintaining manageable device complexity
2Stability of the object's composition
If the adhesive layer thickness is increased to prevent termination tape deformation, then high-temperature stability is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent specifies the adhesive layer thickness parameter within 5-20 μm, providing an optimal range that ensures sufficient thermal stability while remaining feasible for standard manufacturing processes. This parameter optimization reduces the stringency of precision requirements compared to thinner layers
Solution Approach 2:
The patent applies local quality by concentrating the adhesive material specifically at the termination tape region where it is most needed for preventing short-circuits and deformation. The adhesive layer is localized to the electrode plate ends rather than being uniformly distributed, improving stability where required while simplifying overall manufacturing
3Reliability
If the electrolyte additive concentration is optimized to enhance high-temperature performance, then battery safety at high voltage is improved, but the manufacturing complexity increases
Solution Approach 1:
The patent optimizes the electrolyte additive concentration within 0.5-5 wt%, with lithium difluoro(oxalato)borate specifically mentioned. This concentration range enhances high-temperature performance and high-voltage stability while maintaining reasonable manufacturing complexity through straightforward formulation
Solution Approach 2:
The patent uses electrolyte additives as intermediary substances that mediate between the electrode materials and the electrolyte solution. These additives, particularly lithium difluoro(oxalato)borate, form protective interface layers that enhance safety at high voltage and temperature without requiring complex structural modifications to the battery design
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 solution effectively reduces the risk of short-circuits and deformation, maintaining adhesive layer stability and improving high-temperature performance, thus enhancing the safety and cycling performance of lithium-ion batteries.
Implementation Method 1
the electrolyte additive includes lithium difluoro(oxalato)borate... effectively reduces the risk of short-circuits and deformation, maintaining adhesive layer stability and improving high-temperature performance
Implementation Method 2
a termination tape with a specific area-to-width ratio and a cross-linked modified rubber adhesive layer... maintaining adhesive layer stability and improving high-temperature performance
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. An electrolyte additive includes lithium difluoro(oxalato)borate. 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; using a total weight of the non-aqueous electrolyte solution as a reference, a content of lithium difluoro(oxalato)borate is B3 wt %; and a width of the positive electrode plate is C cm; wherein a ratio of A to B3 is in a range of 5-200 and a ratio of A to C is in a range of 1 to 3. The battery can effectively improve high-temperature performance.