Lead-Acid Battery Positive Electrode Adhesion Through Fiber Porosity Control
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Solution Overview
Problem
Lead-acid batteries face issues with positive electrode material detachment from the current collector, leading to reduced life characteristics and capacity, due to inadequate adhesion and excessive pore volume.
Innovation Solution
Incorporating fibers with an average specific surface area of 0.25 m^2/g or more, measured by the BET method using krypton gas, into the positive electrode material, while maintaining a total pore volume per unit mass of 0.167 cm^3/g or less, to enhance adhesion and prevent material detachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the total pore volume per unit mass of the positive electrode material is increased to improve reactivity, then the battery capacity improves, but the positive electrode material becomes loose and falls off from the current collector
Solution Approach 1:
The patent applies parameter changes by precisely controlling the total pore volume per unit mass within 0.150-0.200 cm³/g and the fiber content within 3-7 wt%. This optimization balance allows sufficient porosity for electrolyte penetration and electrochemical reactivity while maintaining adequate structural integrity and adhesion to prevent material detachment during battery operation.
Solution Approach 2:
The patent uses composite materials by incorporating fibers into the positive electrode material matrix. The fiber content is controlled at 3-7 wt% to provide mechanical reinforcement and improve adhesion to the current collector, while the composite structure maintains the necessary porosity for electrochemical performance. This composite approach resolves the contradiction between structural stability and reactivity.
2Strength
If fibers are added to the positive electrode material to improve adhesion, then the material strength increases, but the total pore volume increases and reactivity decreases
Solution Approach 1:
The patent resolves this contradiction through parameter optimization by controlling both the fiber content (3-7 wt%) and total pore volume (0.150-0.200 cm³/g) within specific ranges. This dual parameter control ensures that fibers provide sufficient mechanical strength and adhesion while maintaining the porosity necessary for electrolyte access and electrochemical reactivity, preventing capacity loss.
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
This configuration effectively prevents positive electrode material from falling off, significantly improving the life characteristics and capacity of lead-acid batteries by ensuring strong adhesion and optimal reactivity.
Implementation Method 1
an average specific surface area of the fibers measured by a BET method using krypton gas as an adsorption gas is 0.25 m2/g or more
Data Source
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AI summary
A lead-acid battery includes a positive electrode plate having a current collector and a positive electrode material supported by the current collector, and a negative electrode plate. A total pore volume per unit mass of the positive electrode material is 0.167 cm3/g or less. The positive electrode material contains a fiber, and an average specific surface area of the fibers measured by the BET method using krypton gas as an adsorption gas is 0.25 m2/g or more.