Porous Electrode Plate Composition for Uniform Electrolyte Infiltration
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Solution Overview
Problem
Lithium-ion battery electrode plates have low porosity and nonuniform pore distribution, leading to inadequate electrolyte infiltration, increased polarization, and unsatisfactory performance.
Innovation Solution
Incorporating a compound represented by Formula (I) as a pore-forming agent, which forms a hydrophobic group at elevated temperatures, creating a high porosity and uniform pore distribution in the electrode plate, enhancing electrolyte infiltration and retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional pore-making methods are used, then some porosity is achieved, but the porosity is low and pore distribution is nonuniform
Solution Approach 1:
The patent introduces a porous polymer compound (polyacrylonitrile or polyacrylamide) as a pore-forming agent that creates a three-dimensional porous network structure within the electrode material layer. This porous framework enables high porosity (30-60%) and uniform pore distribution throughout the electrode, resolving the contradiction between achieving sufficient porosity and maintaining uniform pore distribution.
Solution Approach 2:
The patent creates a composite structure by integrating the porous polymer compound with the electrode material (active material, conductive agent, and binder). The porous polymer forms a distinct phase that creates interconnected pores while maintaining structural integrity, achieving both high porosity and uniform distribution without compromising electrode strength.
2Quantity of substance
If porosity is increased to improve electrolyte infiltration, then electrolyte retention improves, but the electrode plate structure becomes weaker
Solution Approach 1:
The porous polymer compound creates a controlled porous network that provides both electrolyte pathways and structural support. The three-dimensional porous framework maintains electrode integrity while enabling high electrolyte retention capacity, resolving the contradiction between porosity and strength.
Solution Approach 2:
The patent optimizes the content of the porous polymer compound (0.1-20 wt%) and controls processing parameters (drying temperature 60-150°C, slurry solid content 30-70 wt%) to achieve the desired balance between porosity and mechanical strength, allowing the electrode to maintain sufficient strength while achieving high electrolyte retention.
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 electrode plate exhibits improved porosity, reduced initial polarization, and enhanced cycle performance by effectively capturing and retaining the electrolyte, leading to increased battery efficiency and longevity.
Implementation Method 1
Incorporating a compound represented by Formula (I) as a pore-forming agent, which forms a hydrophobic group at elevated temperatures, creating a high porosity and uniform pore distribution in the electrode plate
Implementation Method 2
the capacity of retaining the electrolytic solution is higher, the initial polarization is alleviated
Data Source
AI summary
An electrode plate and a method for preparing same are provided. The electrode plate according to this application includes a current collector and an electrode material layer disposed on at least one surface of the current collector. The electrode material layer includes an active material and optionally a conductive agent. The electrode material layer includes a compound represented by Formula (I). The electrode plate according to this application is characterized by a relatively high porosity, more uniform distribution of pores, a more noticeable effect of being initially infiltrated by an electrolytic solution, a higher capacity of retaining the electrolytic solution, alleviated initial polarization, and a reduced direct-current resistance (DCR), and therefore, can improve the performance of a battery that contains the electrode plate.