Fluorophosphate Electrode Paste for Thick Battery Plates
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Solution Overview
Problem
Lithium ion secondary batteries face challenges with thick electrode plates, including concentration polarization, poor rate performance, and capacity degradation due to increased lithium ion migration distances, which conventional methods like porosity adjustment and conductive polymer use either fail to address effectively or introduce additional issues such as high manufacturing costs and energy density reduction.
Innovation Solution
A battery electrode plate is developed using a fluorophosphate-based electrode paste with a specific composition that includes active substances, conductive agents, polymer binders, and fluorophosphates, applied to a current collector and processed through drying and rolling, enhancing lithium ion migration and electrochemical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the thickness of the electrode plate is increased to improve energy density, then the energy density is improved, but the migration path of lithium ions is prolonged causing concentration polarization and poor rate performance
Solution Approach 1:
The patent applies local quality by creating a non-uniform porosity distribution within the electrode plate thickness direction. The porosity is higher near the current collector and gradually decreases toward the outer surface, optimizing lithium ion migration pathways locally throughout the electrode structure to address the contradiction between thick electrode design and ion transport efficiency
Solution Approach 2:
The patent changes the porosity parameter spatially within the electrode plate. By controlling the porosity to vary from high near the current collector to low at the outer surface, the patent optimizes the balance between maintaining structural integrity and facilitating rapid lithium ion migration, thereby improving rate performance while preserving high energy density
2Speed
If conventional methods adjust porosity distribution to improve lithium ion migration, then migration speed is improved, but manufacturing complexity increases and energy density decreases
Solution Approach 1:
The patent merges the porosity control function with the existing electrode fabrication process. By integrating porosity gradient formation into the standard coating and drying procedures without requiring separate manufacturing steps, the patent achieves complex internal structure control while maintaining simple manufacturing processes and high energy density
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 method results in battery electrode plates with improved cycling performance, high rate charge and discharge capabilities, and a fire retardant effect, suitable for industrial production with reduced costs and compatibility with existing equipment.
Implementation Method 1
the key point is to increase the migration speed of lithium ions in the electrode plate
Implementation Method 2
applying the battery paste to the current collector, drying and rolling to obtain the battery electrode plate
Data Source
AI summary
Provided in the present invention are a battery paste, a battery electrode plate, and a preparation method therefor, the battery electrode plate comprising a current collector and an electrode paste film attached to the current collector; the electrode paste film comprises an active substance, a conductive agent, a polymer binder, and fluorophosphate Compared to the prior art, by means of adjusting the components of the electrode paste film, prepared battery electrode plates of the present invention, particularly thick electrode plates, have excellent recycling performance and high rate charge and discharge performance; the preparation method is simple, easy to execute, and low cost, can incorporate existing production devices, and is suitable for use in industrial production; in addition, the battery electrode plate of the present invention contains fluorophosphate, which has a fire retardant effect and can improve the safety of lithium ion batteriesMZ+[POxFy]Z (I)