Alkaline Cell Separator-Electrolyte Pairing for Lower Impedance
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Solution Overview
Problem
Existing alkaline electrochemical cells face challenges in achieving lower overall battery impedance to enhance power capability and service life, particularly in powering contemporary electronic devices.
Innovation Solution
The use of an alkaline electrolyte solution and a specific separator combination in an alkaline electrochemical cell, which includes a cathode with manganese dioxide and an anode with zinc, along with a gelling agent and additives, to reduce battery impedance and improve performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional separator and electrolyte combinations are used in alkaline electrochemical cells, then the battery structure is simple and manufacturing is easier, but the overall battery impedance is high which limits power capability and service life
Solution Approach 1:
The patent applies composite materials by combining a porous polymer separator with specific electrolyte compositions containing zinc oxide and potassium hydroxide. This composite approach reduces overall battery impedance while maintaining structural simplicity, directly addressing the contradiction between power capability improvement and device complexity
Solution Approach 2:
The patent changes physical and chemical parameters of the electrolyte system by specifying precise concentrations of zinc oxide (0.1-5% by weight) and potassium hydroxide (2-10% by weight), along with controlling separator porosity (30-70%) and thickness (10-100 micrometers). These parameter optimizations reduce impedance and enhance power capability without significantly increasing complexity
2Duration of action of moving object
If conventional separator and electrolyte combinations are used in alkaline electrochemical cells, then the manufacturing process is simpler, but the service life is reduced due to higher overall battery impedance
Solution Approach 1:
The patent employs composite materials consisting of a porous polymer separator combined with an optimized electrolyte mixture containing zinc oxide and potassium hydroxide. This composite structure reduces overall battery impedance, enabling extended service life through improved ion transport efficiency while keeping the manufacturing process relatively simple
Solution Approach 2:
The patent optimizes service life by precisely controlling electrolyte composition parameters including zinc oxide concentration (0.1-5% by weight), potassium hydroxide concentration (2-10% by weight), separator porosity (30-70%), and separator thickness (10-100 micrometers). These parameter changes reduce impedance and enhance durability without requiring complex manufacturing processes
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
This configuration results in lower overall battery impedance, leading to improved power capability and extended service life, as demonstrated by enhanced performance in discharge tests such as the ANSI/IEC Motorized Toys Test, Remote Controls Test, and Clock/Radio Test.
Implementation Method 1
An electrolyte in contact with the anode and the cathode contains ions that flow through the separator between the electrodes to maintain charge balance throughout the battery during discharge
Implementation Method 2
The anode active material is capable of reducing the cathode active material. When a battery is used as an electrical energy source in a device, electrical contact is made to the anode and the cathode, allowing electrons to flow through the device and permitting the respective oxidation and reduction reactions to occur to provide electrical power
Implementation Method 3
The anode active material is capable of reducing the cathode active material. When a battery is used as an electrical energy source in a device, electrical contact is made to the anode and the cathode, allowing electrons to flow through the device and permitting the respective oxidation and reduction reactions to occur to provide electrical power
Data Source
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AI summary
An alkaline electrochemical cell having an anode including electrochemically active anode material comprising at least 3.3 g of zinc or zinc alloy, a cathode including electrochemically active cathode material comprising 10 g to 11.5 g of manganese dioxide, a separator between the anode and the cathode, and an electrolyte comprising 25% to 35% by weight of an alkali hydroxide based on the total weight of the electrolyte. The separator in combination with the electrolyte may have an initial area-specific resistance between 100 mOhm-cm2 and 220 mOhm-cm2.