Through-Hole Battery Electrode Structure for Low Lithium Side Reactions
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Solution Overview
Problem
Existing electrode materials for secondary batteries face challenges such as increased lithium resistance due to side reactions, unsatisfactory fiberization structures, and vulnerability to cracks from external impacts.
Innovation Solution
The electrode material incorporates a base film with through holes acting as a binder, combined with a current collector and active material particles, to reduce lithium side reactions, simplify the manufacturing process, and minimize crack formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If PTFE is used for fiberization to form active material sheet, then fiberization capability is improved, but lithium resistance increases due to side reaction
Solution Approach 1:
The patent introduces a binder as an intermediary substance between PTFE fibers and active material particles. The binder coats the PTFE fibers, preventing direct contact between lithium and PTFE, thereby reducing side reactions while maintaining the fiberization structure's mechanical benefits
Solution Approach 2:
The patent creates a composite structure combining PTFE fibers, binder material, and active material particles. This composite approach allows the PTFE to provide structural integrity and fiberization while the binder suppresses harmful side reactions, achieving both manufacturability and reliability
2Reliability
If composite binder including PTFE and PVDF or copolymer is used, then lithium side reaction is reduced, but fiberization structure becomes unsatisfactory
Solution Approach 1:
The patent applies different materials to different locations within the electrode structure. PTFE fibers provide the overall structural framework and fiberization, while the binder material is locally applied at contact points between particles and fibers to suppress side reactions, optimizing both structure and chemistry locally
3Reliability
If mixture of PTFE and CMC or PAA is used to minimize lithium resistance, then side reaction is reduced, but fiberization structure remains unsatisfactory and shear force composition is strong
Solution Approach 1:
The patent segments the electrode structure into distinct functional components: PTFE fibers form the structural skeleton, while binder and active material particles are distributed within the fiber network. This segmentation allows each component to perform its specialized function without compromising the overall fiberization structure
4Ease of manufacture
If conventional electrode material structure is used, then manufacturing is established, but cracks occur due to external impact
Solution Approach 1:
The patent employs a flexible binder film that coats and binds active material particles together. This flexible film structure can deform and absorb external impact forces, preventing crack propagation through the electrode while maintaining structural integrity during manufacturing and operation
Data Source
AI summary
An electrode for a secondary battery and a method for manufacturing the same are disclosed, which reduces lithium side reactions, has a simple process, and can reduce cracks caused by external impact. The electrode material for a secondary battery according to an exemplary embodiment of the present invention comprises a base film with a plurality of through holes, a binder and a current collector. The binder includes active material particles dispersed therein and is fixed to the through holes. The current collector is attached to the base film.