ZnO-CNF Additive for Lead Acid Battery Negative Plate
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Solution Overview
Problem
Lead acid batteries face challenges in maintaining high performance and cyclability, especially in hybrid vehicles and industrial applications, due to sulphation of the negative plate, which hinders charging and reaction reversibility, and existing carbon additives increase water consumption when used in high concentrations.
Innovation Solution
The use of a ZnO-CNF additive synthesized in situ through electrospinning, where ZnO nanoparticles are uniformly distributed and anchored on carbon nanofibers, enhancing surface area and reaction sites, inhibiting PbSO4 crystal growth and hydrogen evolution, thus improving charge acceptance and reversibility without increasing water consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If carbon additives (graphite or activated carbon) are added to the negative active mass to improve conductivity and prevent sulphation, then charging process and battery performance are improved, but water consumption increases due to reduced hydrogen evolution overvoltage
Solution Approach 1:
The patent uses composite materials by combining carbon nanofibers (CNFs) with metal oxide nanoparticles (such as ZnO, MnO2, Fe2O3, or CuO) to create a synergistic additive. The carbon matrix provides conductivity and structural framework, while the metal oxide nanoparticles suppress hydrogen evolution and water consumption. This composite approach allows the battery to benefit from both the conductivity enhancement of carbon and the water-saving effect of metal oxides, resolving the contradiction between improved charging and increased water consumption.
Solution Approach 2:
The patent changes the physical and chemical parameters of the carbon additive by controlling the synthesis conditions (electrospinning parameters, heat treatment temperature and duration) to optimize the morphology, surface area, and nanoparticle distribution of the composite material. By adjusting these parameters, the additive achieves optimal conductivity and hydrogen evolution suppression while minimizing water consumption, thus resolving the technical contradiction.
2Productivity
If high concentration of carbon additives is used to improve charge acceptance and prevent sulphation, then battery performance in PSoC conditions is improved, but hydrogen evolution overvoltage is reduced leading to increased water consumption
Solution Approach 1:
The patent applies local quality by creating a heterogeneous composite structure where metal oxide nanoparticles are distributed throughout the carbon nanofiber matrix. Different regions of the additive have different functions: the carbon nanofibers provide conductivity and structural support for charge acceptance, while the metal oxide nanoparticles locally suppress hydrogen evolution and water consumption. This spatial distribution of different materials with different functions resolves the contradiction between high charge acceptance and low water consumption.
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 ZnO-CNF additive enhances charge acceptance, cold cranking performance, and battery life by maintaining higher voltage and current supply at low temperatures, reducing capacitance losses, and enabling efficient recovery of battery capacity even after deep discharge.
Implementation Method 1
The use of the electrostatic spinning technique to obtain these composite carbon materials (additives)
Implementation Method 2
The clear solution is introduced into a glass syringe provided with a steel needle and housed in the pump inside the electrospinning system. Following the application of a 17kV electric field, the solution is electrospun and deposited on a special metal target placed at a distance of 12cm from the needle tip.
Implementation Method 3
an innovative in situ synthesis process for zinc oxide (ZnO), allows unique morphologies to be obtained
Implementation Method 4
The ZnO-CNF additive enhances charge acceptance, cold cranking performance, and battery life by maintaining higher voltage and current supply at low temperatures
Implementation Method 5
one of the major problems at high depth of discharge (DOD) is sulphation of the negative plate, which makes the charging process and reaction reversibility difficult or impossible
Data Source
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AI summary
The present invention relates to an additive for negative active mass of lead acid batteries, said additive being based on carbon nano fibre (CNF) and zinc oxide (ZnO) nanoparticles, which can be obtained in situ simultaneously with carbon nanofibers, to the use of said additive in the industrial and automotive sectors, and to a procedure for its preparation.