Electrode Plate Composition for Better Electrolyte Infiltration
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Solution Overview
Problem
Battery cells exhibit poor cycle performance due to the poor absorption properties of the active material in the electrode plate, leading to inadequate infiltration of the electrolytic solution and slower diffusion rates.
Innovation Solution
Incorporation of an aldehyde-ketone polymer in the active material layer of the electrode plate to enhance absorption properties, characterized by specific porosity, compaction density, and absorption rate parameters, forming uniform infiltration points and improving the active material's interaction with the electrolytic solution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the active material layer uses conventional materials and structure, then the manufacturing process is simple, but the absorption rate of electrolytic solution is poor resulting in inadequate infiltration
Solution Approach 1:
The patent applies composite materials by combining active material particles with polymer material to form an composite active material layer. The polymer material acts as a binder and structural framework that improves electrolytic solution infiltration while maintaining electrical conductivity. This composite structure resolves the contradiction by enhancing absorption rate through the polymer network without overly complicating the manufacturing process.
Solution Approach 2:
The patent utilizes porous materials by creating a porous structure within the active material layer where active material particles are distributed within a polymer matrix. This porous architecture facilitates electrolytic solution penetration and absorption while maintaining structural integrity. The porosity is controlled through the particle size distribution and polymer concentration, improving infiltration without requiring complex manufacturing steps.
2Quantity of substance
If the active material layer has high compaction density, then the capacity density is improved, but the absorption property of active material deteriorates leading to poor cycle performance
Solution Approach 1:
The patent applies local quality by creating regions with different properties within the active material layer. The polymer material forms a continuous phase that provides infiltration pathways throughout the layer, while active material particles are distributed within this polymer matrix. This local differentiation allows high compaction density in regions with particle aggregates while maintaining absorption properties through the polymer network, thus improving both capacity density and cycle performance simultaneously.
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 aldehyde-ketone polymer enhances the absorption rate and cycle performance of the battery cell by ensuring uniform infiltration and reducing molecular chain entanglement, stabilizing the polymer in the electrolytic solution, and forming a protective layer to suppress side reactions.
Implementation Method 1
d denotes the diameter of a capillary in a capillary test of the active material layer, which is in units of mm; h denotes the liquid level in the capillary, which is in units of mm; v denotes the absorption rate of the active material layer, which is in units of mg/s
Implementation Method 2
the active material layer satisfies: v/λ>1, where v denotes the absorption rate of the active material layer... The aldehyde-ketone polymer... can form uniform, well-infiltrated points at the interior of the active material layer, and thus uniformly improves the infiltration property of the active material layer, increasing the absorption rate of the entire active material layer
Data Source
AI summary
An electrode plate, and a battery cell, a battery and an electrical device are described. related thereto. The electrode plate comprises a current collector and an active material layer disposed on at least one surface of the current collector, the active material layer comprises an active material and an aldehyde-ketone polymer, and the active material layer satisfies Mathematical Expressions (1) to (3). The aldehyde-ketone polymer, a component of the active material layer, can form uniform, well-infiltrated points at the interior of the active material layer, and thus uniformly improves the infiltration property of the active material layer, increasing the absorption rate of the entire active material layer, and thereby enhancing the cycle performance of the battery cell.λ=1-P1P2Mathematical Expression (1)v=π×(d2)2×h×ρtMathematical Expression (2)v/λ>1.00Mathematical Expression (3)