Composite Lead-Acid Battery Separators for Antimony and Acid Control
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Solution Overview
Problem
Current lead acid battery separators fail to effectively address issues such as antimony poisoning, acid stratification, and active material shedding, leading to reduced battery performance and lifespan.
Innovation Solution
The development of an improved composite separator for lead acid batteries, incorporating fibers, silica particles, and a binder, which enhances oxidation resistance, wettability, acid retention, and puncture strength, while reducing electrode shedding and antimony poisoning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional battery separators are used, then basic separation function is achieved, but antimony poisoning and active material shedding occur leading to reduced battery performance
Solution Approach 1:
The patent applies composite materials by combining glass fibers with silica particles (including hollow silica particles) to create a separator that simultaneously provides mechanical strength, oxidation resistance, and antimony suppression. This composite structure resolves the contradiction by integrating multiple functional properties into a single separator material that prevents antimony poisoning while maintaining reliability.
Solution Approach 2:
The patent utilizes porous materials by incorporating hollow silica particles and maintaining a porous structure in the composite separator. This allows efficient ionic current passage while the porous silica particles specifically adsorb and suppress antimony, thereby improving battery performance without suffering from antimony poisoning.
2Duration of action of stationary object
If conventional separators are used, then ionic current passage is permitted, but acid stratification occurs leading to reduced battery lifespan
Solution Approach 1:
The patent applies parameter changes by modifying the physical and chemical properties of the separator through the addition of silica particles with specific surface area characteristics. These parameter changes enhance acid retention and prevent acid stratification, thereby extending battery lifespan while maintaining proper ionic current passage.
3Reliability
If conventional separators are used, then electrode separation is achieved, but active material shedding reduces battery performance
Solution Approach 1:
The composite structure of glass fibers and silica particles creates a more robust separator that physically prevents active material shedding while maintaining electrode separation. The silica particles fill interstices and create a tighter matrix that reduces material loss, thereby improving battery performance.
4Strength
If porous nonconductor materials are used for separators, then ionic current passage is enabled, but oxidation resistance and puncture strength are insufficient
Solution Approach 1:
The patent applies composite materials by combining glass fibers with silica particles to create a separator that simultaneously achieves high puncture strength and oxidation resistance. The silica component specifically provides oxidation resistance while the glass fiber matrix provides mechanical strength, resolving the contradiction between these two properties.
Solution Approach 2:
The patent applies local quality by distributing silica particles throughout the separator structure, creating localized regions of enhanced oxidation resistance and strength. This local enhancement of properties allows the separator to resist oxidation and puncture while maintaining overall porosity for ionic current passage.
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 improved composite separator effectively reduces antimony poisoning, acid stratification, and active material shedding, leading to enhanced battery performance, increased cycle life, and extended warranty periods.
Implementation Method 1
silica particles... reducing antimony poisoning
Implementation Method 2
a battery separator should permit an ionic current between the positive and negative electrodes with the least possible resistance
Implementation Method 3
enhances oxidation resistance
Implementation Method 4
incorporating fibers, silica particles, and a binder
Data Source
AI summary
Disclosed herein are novel or improved fibrous layers, composites, composite separators, separators, composite mat separators, composite mat separators containing fibers and silica particles, battery separators, lead acid battery separators, and/or flooded lead acid battery separators, and/or batteries, cells, and/or methods of manufacture and/or use of such fibrous layers, composites, composite separators, separators, battery separators, lead acid battery separators, cells, and/or batteries. In addition, disclosed herein are methods, systems, and battery separators for enhancing battery life, reducing internal resistance, reducing metalloid poisoning, reducing acid stratification, and/or improving uniformity in at least enhanced flooded batteries.