Alkaline Battery Cathode Binder for Discharge and Electrolyte Uptake
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Solution Overview
Problem
Alkaline batteries face a challenge in achieving higher discharge performance while maintaining adequate liquid absorption properties of the positive electrode mixture, as increasing the density of the positive electrode mixture to improve discharge performance leads to reduced liquid absorption, thereby increasing manufacturing costs and making it difficult to produce the batteries at a low cost.
Innovation Solution
The use of fluorine resin as a binder in the positive electrode mixture, with a ratio of 0.2 wt % to 0.8 wt % with respect to the positive electrode active material, balances density and liquid absorption, enhancing discharge performance without compromising electrolyte injection efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the density of the positive electrode mixture is increased to improve discharge performance, then discharge performance is improved, but liquid absorption property is reduced
Solution Approach 1:
The patent changes the chemical composition parameters of the positive electrode mixture by incorporating specific ratios of conductive materials (0.1-5 wt% graphite, 0.1-5 wt% acetylene black) and controlling water content (1-10 wt%), along with using manganese dioxide with specific surface area (0.5-5 m²/g) and pore volume (0.003-0.03 ml/g). These parameter adjustments optimize both density and liquid absorption properties simultaneously, resolving the contradiction between improved discharge performance and maintained liquid absorption.
2Power
If the density of the positive electrode mixture is increased to improve discharge performance, then discharge performance is improved, but manufacturing cost increases
Solution Approach 1:
The patent optimizes manufacturing cost by controlling water content at economical levels (1-10 wt%) and using readily available conductive materials within specific ranges. The method achieves high discharge performance through controlled parameters rather than excessive material addition, making the process economically viable while improving battery performance.
Solution Approach 2:
The patent applies partial action by using moderate amounts of conductive materials (0.1-5 wt% each for graphite and acetylene black) rather than excessive quantities. This partial addition is sufficient to achieve the desired discharge performance improvement without incurring disproportionate manufacturing costs, resolving the contradiction between performance enhancement and cost control.
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 alkaline battery with fluorine resin as a binder exhibits improved discharge performance across various load conditions, maintaining high liquid absorption and density similar to batteries using polyacrylic acid, thus reducing manufacturing time and costs.
Implementation Method 1
an electrolyte that includes an alkaline aqueous solution
Implementation Method 2
a gel-form negative electrode mixture that contains zinc powder as a negative electrode active material
Implementation Method 3
a positive electrode mixture containing manganese dioxide as a positive electrode active material
Data Source
AI summary
An alkaline battery includes a bottomed tubular battery can made of metal, serving as a positive electrode current collector; a positive electrode mixture sealed in the battery can and formed in a cylindrical shape, the positive electrode mixture containing manganese dioxide as a positive electrode active material and containing a binder including fluorine resin such that a ratio of the binder to the positive electrode active material is 0.2 wt % or more and 0.8 wt % or less; a bottomed tubular separator sealed in the battery can and arranged on an inner peripheral side of the positive electrode mixture; a gel-form negative electrode mixture sealed in the battery can, arranged inside the separator, containing zinc powder as a negative electrode active material; and an electrolyte that includes an alkaline aqueous solution, sealed in the battery can.