Through-Hole Electrode Material for Lower 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 external impacts leading to cracks.
Innovation Solution
The electrode material incorporates a binding sheet with through-holes, acting as a binder to facilitate lithium expansion and contraction, thereby reducing side reactions and simplifying the manufacturing process. The binding sheet is made of materials like PVDF, PTFE, and synthetic fibers, and is treated with a sodium naphthalene solution to enhance bonding strength.
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 invention uses a composite binder system comprising PTFE combined with PVDF and conductive carbon materials. This composite approach maintains the excellent fiberization properties of PTFE while PVDF and carbon materials suppress lithium side reactions and improve electrical conductivity, thereby resolving the contradiction between manufacturability and reliability
2Reliability
If composite binder including PTFE and PVDF is used, then lithium side reaction is suppressed, but fiberization structure becomes unsatisfactory
Solution Approach 1:
The invention applies different materials to different regions/functions: PTFE provides the fiberization matrix structure, while PVDF and conductive carbon are distributed within this matrix to locally suppress side reactions and enhance conductivity. This spatial differentiation of material functions resolves the contradiction between reliability and manufacturability
3Reliability
If strong compositional force for shear force is applied to suppress side reaction, then lithium resistance increases, but battery performance degrades
Solution Approach 1:
The invention changes the chemical composition parameters of the binder system by incorporating conductive carbon materials alongside PVDF and PTFE. This parameter modification enables effective side reaction suppression through chemical mechanisms rather than relying solely on mechanical shear force, thereby maintaining battery performance while improving reliability
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 approach reduces lithium side reactions, simplifies the manufacturing process, and minimizes cracks caused by external impacts, resulting in improved performance and durability of the secondary battery electrode material.
Implementation Method 1
a binding sheet, an active material layer and a current collector. The binding sheet includes a plurality of through-holes penetrating the first surface and the second surface
Implementation Method 2
The binding sheet is made of materials like PVDF, PTFE, and synthetic fibers, and is treated with a sodium naphthalene solution to enhance bonding strength
Data Source
AI summary
Disclosed are an electrode material for a secondary battery and a method of manufacturing the electrode material, capable of reducing lithium side reactions, simplifying processes, and reducing cracks caused by external impact. The electrode material for a secondary battery includes a bonding sheet, an active material layer, and a current collector. The bonding sheet includes a plurality of through-holes penetrating first and second surfaces opposite to each other. The active material layer includes a first layer covering the first surface, a second layer covering the second surface, and a connecting layer formed inside the through-holes to connect the first layer and the second layer. The current collector is attached to the second layer.