Lignin Organic Expander for Lead Storage Battery Charge Acceptance
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Solution Overview
Problem
Lead storage batteries experience a decrease in discharge performance and charge acceptance due to the formation of lead sulfate, which is not easily dissolved during charging, leading to deteriorated charging performance.
Innovation Solution
An organic expander for lead storage batteries containing lignin with specific methoxy group and sulfonic acid content, along with selected organic acids, is added to the electrode plate to improve charge acceptance while maintaining discharge characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If lignin is added to the negative electrode active material, then discharge performance is improved and sulfation is suppressed, but charge acceptance is lowered
Solution Approach 1:
The patent applies parameter changes by precisely controlling the methoxy group content of lignin within 3-20% by mass and the organic acid content within 0.0001-5% by mass per solid content of the organic expander. This optimization of chemical composition parameters resolves the contradiction by finding the optimal balance point where discharge performance is maintained while charge acceptance is improved compared to conventional lignin additions.
Solution Approach 2:
The patent creates a composite material system by combining lignin with specific organic acids (xylonic acid, galactonic acid, arabinonic acid, meta-saccharinic acid, iso-saccharinic acid, or glycolic acid) in defined proportions. This composite approach allows the synergistic effect of lignin's discharge performance enhancement and organic acid's charge acceptance improvement, resolving the technical contradiction between these two opposing performance characteristics.
2Productivity
If lead sulfate becomes coarsened, then the lead sulfate is hardly dissolved in the charge reaction, but the discharge reaction proceeds efficiently
Solution Approach 1:
The patent changes the chemical environment parameters by introducing organic acids that modify the electrochemical conditions during charging and discharging. This parameter modification prevents lead sulfate from coarsening excessively, maintaining it in a finer state that remains soluble during charging while still allowing efficient discharge reactions to proceed.
Solution Approach 2:
The organic acid acts as an intermediary substance that mediates between the lead sulfate formation during discharge and its dissolution during charge. The organic acid creates a chemical environment that facilitates lead sulfate solubility and prevents excessive coarsening, enabling both discharge efficiency and charge reaction efficiency to be maintained simultaneously.
Data Source
AI summary
Provided is an organic expander for a lead storage battery, said organic expander containing lignin in which the methoxy group content relative to the solid content is 3 to 20 mass%, wherein said organic expander contains an organic acid in an amount of 0.0001 to 5 mass% relative to the solid content of the organic expander. It is possible to improve charge acceptance while maintaining the discharge characteristics of the lead storage battery.