Battery Separator Post-Crosslinking for Insulation and Tensile Strength
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Solution Overview
Problem
Conventional methods for improving separator properties in lithium secondary batteries focus on manufacturing processes, lacking a method to enhance insulation and mechanical strength through post-treatment of already manufactured separators.
Innovation Solution
A method involving deintercalation of elements in the binder to create crosslinkable sites, followed by treatment with a crosslinking initiator and/or catalyst, which forms crosslinks between the binder molecules, enhancing the separator's insulation and mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional manufacturing processes are used to make separators, then production efficiency is maintained, but insulation resistance and mechanical strength are insufficient
Solution Approach 1:
The patent applies preliminary action by incorporating crosslinkable functional groups into the binder molecules during separator manufacturing, but the actual crosslinking reaction is postponed to a later stage. This allows the separator to be manufactured using conventional processes while preparing it for subsequent crosslinking treatment that will enhance mechanical strength and insulation resistance without modifying the manufacturing process itself.
Solution Approach 2:
The patent utilizes parameter changes by transforming the chemical state of the binder through crosslinking reactions. The binder molecules transition from a non-crosslinked state with lower mechanical properties to a crosslinked state with enhanced strength and insulation resistance. This chemical parameter change occurs after manufacturing, allowing conventional production methods to be maintained.
2Reliability
If crosslinking treatment is applied to enhance separator properties, then insulation resistance and mechanical strength improve, but additional processing steps are required
Solution Approach 1:
The patent employs an intermediary approach by using binder molecules with built-in crosslinkable functional groups as mediators. These functional groups act as intermediaries that enable crosslinking reactions to occur under mild conditions using simple crosslinking agents. This intermediary mechanism allows crosslinking to be achieved with minimal additional processing steps while significantly improving insulation resistance and reliability.
Solution Approach 2:
The patent applies parameter changes by modifying the chemical reactivity parameters of the binder through the introduction of crosslinkable functional groups. This enables the binder to undergo crosslinking reactions under controlled conditions with simple crosslinking agents, achieving enhanced insulation resistance without requiring complex additional processing equipment or procedures.
3Strength
If separator composition is modified to improve properties, then performance increases, but manufacturing process must be changed
Solution Approach 1:
The patent applies preliminary action by pre-equipping binder molecules with crosslinkable functional groups during separator manufacturing, but delaying the actual crosslinking enhancement until after production. This preliminary preparation allows conventional manufacturing processes to remain unchanged while enabling subsequent crosslinking treatment to improve tensile strength and other mechanical properties.
Solution Approach 2:
The patent utilizes parameter changes by transforming the molecular structure of the binder through crosslinking reactions after manufacturing. The binder transitions from a linear or branched structure to a crosslinked network structure, fundamentally changing mechanical parameters such as tensile strength and thermal stability without requiring changes to the manufacturing process itself.
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 post-treatment approach significantly improves the separator's insulation and tensile strength, offering a distinct method that can be applied to both polyolefin and non-polyolefin substrate-based separators without altering the manufacturing process or composition, resulting in enhanced performance.
Implementation Method 1
crosslinking the crosslinkable sites to improve insulation properties and mechanical properties of the separator
Data Source
AI summary
A method for improving physical properties of a separator in which is capable of increasing insulation, tensile strength and elongation. The separator also has improved physical properties through the above method. Particularly, the present invention is applied to a separator that has already manufactured. After forming a double bond in the separator that has already manufactured, crosslinking may be formed through the double bond or by adding a separate crosslinking initiator.