Lead-Acid Battery Negative Electrode with Aromatic Ester
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Solution Overview
Problem
Lead-acid batteries face limitations in cycle life, capacity at low temperatures, and deep discharge conditions, necessitating improvements in negative electrode materials and processes.
Innovation Solution
Incorporating an aromatic ester compound, such as benzyl benzoate, into the negative electrode material and electrolytic solution of lead-acid batteries to enhance cycle characteristics by improving the physical and electrochemical properties of the electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If conventional negative electrode materials are used, then manufacturing costs are low and production is simple, but cycle life is short and performance at low temperatures is poor
Solution Approach 1:
The patent uses a composite material system consisting of lead oxide powder, aromatic ester compound, and water. The aromatic ester compound (such as benzyl benzoate) is mixed with lead oxide powder in specific proportions (0.1-10% by mass) to form a composite negative electrode material that exhibits improved cycle characteristics and low-temperature performance while maintaining manufacturing simplicity
Solution Approach 2:
The patent changes the chemical composition parameters of the negative electrode material by introducing aromatic ester compounds with specific molecular structures and properties. By controlling the content of aromatic ester compound within specific ranges and selecting different types (benzyl benzoate, phenyl benzoate, etc.), the patent optimizes the electrochemical performance parameters including cycle life and low-temperature capacity
2Use of energy by moving object
If conventional negative electrode materials are used, then energy return factor is acceptable, but capacity at low temperatures is low
Solution Approach 1:
The patent modifies the chemical composition parameters of the negative electrode material by adding aromatic ester compounds. This changes the electrochemical reaction characteristics and improves the capacity retention at low temperatures while maintaining acceptable energy return factors. The aromatic ester compound content is controlled at 0.1-10% by mass to achieve optimal balance
3Duration of action of moving object
If conventional negative electrode materials are used, then deep discharge cycle life is limited, but material composition is simple
Solution Approach 1:
The patent creates a composite negative electrode material by combining lead oxide powder with aromatic ester compounds. This composite structure provides better resistance to deep discharge conditions and extends cycle life. The aromatic ester compound forms a protective matrix that stabilizes the electrode structure during deep charge-discharge cycles
Solution Approach 2:
The patent optimizes the compositional parameters of the negative electrode material by controlling the aromatic ester compound content within 0.1-10% by mass. This parameter optimization achieves improved deep discharge cycle life (over 1000 cycles at 80% depth of discharge) while keeping the material composition relatively simple and manufacturing process unchanged
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 aromatic ester compounds in lead-acid batteries results in improved cycle characteristics, including extended cycle life and enhanced performance at low temperatures, by promoting fine particle formation and charge reaction efficiency.
Implementation Method 1
the aromatic ester compounds added to the electrolytic solution transfer to the negative electrode active material, adsorb onto lead sulfate generated by discharge reaction, make the particles fine, and then promote charge reaction
Implementation Method 2
the aromatic ester compounds added to the electrolytic solution transfer to the negative electrode active material, adsorb onto lead sulfate generated by discharge reaction
Data Source
Figure 1
Figure 2(a)~2(b)
AI summary
The present invention, in one aspect, provides a negative electrode for a lead-acid battery, comprising: a negative electrode collector; and a negative electrode material comprising an aromatic ester compound.