Battery Electrode Plate Polymer Layer for Faster Electrolyte Infiltration
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Solution Overview
Problem
The active substance in electrode plates of battery cells exhibits poor liquid absorption performance, leading to poor cycle performance of the battery cells.
Innovation Solution
Incorporating a polymer into the active substance layer of the electrode plate, which forms a uniform high infiltration point and improves the liquid absorption speed of the active substance layer, enhancing the affinity with the electrolytic solution to form an in-situ gel, thereby improving the cycle performance of the battery cell.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If polymer is added to active substance layer, then liquid absorption speed is improved, but device complexity increases
Solution Approach 1:
The patent introduces polymer as an intermediary substance in the active substance layer that mediates between the electrolytic solution and active substance particles. The polymer forms a three-dimensional network structure that facilitates electrolyte infiltration and creates in-situ gel, thereby improving liquid absorption speed without requiring fundamental changes to the battery structure.
Solution Approach 2:
The patent creates a composite active substance layer by combining polymer, active substance particles, and electrolytic solution. This composite structure forms an in-situ gel system where the polymer matrix provides structural framework and the electrolyte-filled pores enable rapid ion transport, achieving improved liquid absorption speed while maintaining a manageable composition ratio.
2Reliability
If polymer content is increased, then infiltration performance is improved, but manufacturing precision becomes more difficult to control
Solution Approach 1:
The patent specifies optimal parameter ranges for polymer content (0.1-1.5% for positive electrode, 0.2-5.0% for negative electrode) to balance infiltration performance and manufacturing control. By defining these quantitative parameters, the patent transforms the qualitative goal of improved infiltration into controllable manufacturing specifications, enabling precise control during production while achieving reliable performance.
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 polymer enhances the liquid absorption speed and cycle performance of the battery cell by forming a uniform infiltration point and facilitating rapid solvent diffusion, resulting in improved kinetic performance.
Implementation Method 1
the solvent in the electrolytic solution can quickly diffuse between the molecular chains of the polymer and be wrapped by the molecular chains, and an in-situ gel can be formed on the surface of the active substance
Implementation Method 2
v represents a liquid absorption rate of the active substance layer, in unit of mg/s; d represents a diameter of a capillary tube in a capillary test for the active substance layer
Data Source
AI summary
An electrode plate includes a current collector and an active substance layer disposed on at least one surface of the current collector. The active substance layer includes an active substance and a polymer, and the active substance layer satisfies Formulas (1) to (3).λ=1-P1P2Formula (1)v=π×(d2)2×h×ρtFormula (2)v/λ>1.Formula (3)