Lead-Acid Battery Negative Electrode Using Bisphenol S Condensate
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Solution Overview
Problem
The use of organic expanders in lead-acid battery negative electrode materials can lead to a deterioration in low-temperature high-rate performance due to the expander flowing out during charge-discharge cycles, resulting in insufficient anti-shrink effects.
Innovation Solution
Incorporating a condensate containing a bisphenol S unit and a phenolsulfonic acid unit into the negative electrode material, which enhances negative chargeability and adsorption power, allowing the expander to remain within the material and maintain a fine structure, thereby improving low-temperature high-rate performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If conventional organic expanders (such as bisphenol A condensate or aminobenzenesulfonic acid condensate) are used in negative electrode material, then it becomes easy to form a fine colloid structure, but the expander flows out during charge-discharge cycles resulting in insufficient anti-shrink effect and deteriorated low-temperature high-rate performance
Solution Approach 1:
The invention changes the chemical composition parameters of the organic expander by using a condensate containing a phenolsulfonic acid unit and a bisphenol S unit. This compositional change increases negative chargeability and enhances adsorption to the negative active material, preventing expander outflow during charge-discharge while maintaining the fine colloid structure. The specific parameter change in chemical composition resolves the contradiction between forming fine structure and preventing material loss.
Solution Approach 2:
The invention uses a composite organic expander composed of phenolsulfonic acid unit and bisphenol S unit in specific proportions (molar ratio 1:9 to 9:1). This composite structure combines the benefits of both components: phenolsulfonic acid provides planar structure and negative chargeability, while bisphenol S contributes to the condensate framework. The composite material achieves both fine colloid formation and strong adsorption retention, resolving the performance contradiction.
2Quantity of substance
If organic expander is added to negative electrode material to secure fine pore structure, then porosity is improved, but expander flows out during operation causing loss of substance and performance deterioration
Solution Approach 1:
The invention changes the chemical parameters of the organic expander by incorporating phenolsulfonic acid unit which provides strong negative chargeability. This parameter change enhances the electrostatic adsorption between the expander and the negative active material (lead), preventing expander outflow during charge-discharge cycles. The fine pore structure is maintained while expander retention is significantly improved through this compositional parameter change.
3Ease of manufacture
If conventional condensates (bisphenol A or aminobenzenesulfonic acid) are used as organic expander, then colloid formation is facilitated, but negative chargeability is low resulting in weak adsorption and expander loss
Solution Approach 1:
The invention changes the chemical composition parameter by replacing conventional bisphenol A or aminobenzenesulfonic acid with a condensate containing phenolsulfonic acid unit and bisphenol S unit. This parameter change dramatically increases negative chargeability because the phenolsulfonic acid unit has strong electron-withdrawing capability, creating more negative charges on the expander surface. This enhanced negative chargeability strengthens adsorption to the negative active material while maintaining ease of colloid formation.
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 use of the bisphenol S and phenolsulfonic acid condensate in the negative electrode material effectively suppresses the deterioration of low-temperature high-rate performance by maintaining a fine structure and increasing specific surface area, leading to improved charge acceptance and reduced expander outflow.
Implementation Method 1
the condensate has high negative chargeability and thus has high adsorption power
Data Source
AI summary
A negative electrode plate for a lead-acid battery includes a negative electrode current collector and a negative electrode material. The negative electrode material contains an organic expander. The organic expander includes a condensate containing a bisphenol S unit and a phenolsulfonic acid unit.