Electrode Sheet Undercoat Structure for Lower Battery Internal Resistance
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Solution Overview
Problem
Traditional electrode plates struggle to achieve high ionic and electronic conductivity simultaneously, leading to high direct-current internal resistance and limiting battery performance improvements.
Innovation Solution
Incorporating a conductive agent into a bottom coating between the current collector and active layer, along with a liquid absorption material in the active layer, enhances electrolyte infiltration and conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional electrode plate structure is used, then manufacturing is simple, but ionic conductivity and electronic conductivity cannot be achieved simultaneously, leading to high direct-current internal resistance
Solution Approach 1:
The electrode plate is segmented into multiple functional layers: current collector, bottom coating layer (with conductive agent), active material layer, and top coating layer. This segmentation allows each layer to specialize in specific functions - the bottom coating layer improves electronic conductivity while the active material layer provides ionic conductivity, resolving the contradiction between conductivity requirements and structural simplicity
Solution Approach 2:
The patent employs composite material structure by combining different materials in the bottom coating layer (conductive agents like carbon black, carbon nanotubes, or graphene with binders) and active material layer. This composite approach enables simultaneous achievement of high electronic conductivity through conductive agents and high ionic conductivity through active materials, while managing the complexity through systematic material integration
2Reliability
If conductive agent is added to bottom coating and liquid absorption material to active layer, then ionic conductivity and electronic conductivity are improved, but manufacturing complexity increases
Solution Approach 1:
The conductive agent and liquid absorption material are pre-mixed with binders to form homogeneous slurries before coating. This preliminary preparation ensures uniform distribution of functional materials, simplifies the coating process, and avoids complex in-situ mixing during manufacturing, thereby improving ease of manufacture while achieving the desired conductivity improvements
Solution Approach 2:
The patent optimizes parameters such as the mass ratio of conductive agent to binder (1:1 to 10:1), liquid absorption material content (5-50 wt%), and coating thickness to balance performance improvement with manufacturing simplicity. By carefully controlling these parameters, the patent achieves high conductivity without excessive manufacturing complexity
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 improves both ionic and electronic conductivity, reducing direct-current internal resistance and enhancing battery rate capability.
Implementation Method 1
the liquid absorption rate of the first liquid absorption material is ≥110%
Implementation Method 2
the bottom coating includes a conductive agent
Data Source
AI summary
An electrode sheet, a battery, and an electrical device are described. The electrode sheet comprises a current collector, an undercoat layer, and an active layer, and the undercoat layer is located between the current collector and the active layer, the undercoat layer comprises a conductive agent, the active layer comprises an active material and a first electrolyte absorption material, and the electrolyte absorption rate of the first electrolyte absorption material is greater than or equal to 110%.