Uniform Superabsorbent Particles for Alkaline Cell Discharge
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Solution Overview
Problem
Conventional alkaline electrochemical cells experience inadequate electrolyte availability and incomplete discharge due to the irregular shape and large particle size of superabsorbent materials, leading to reduced zinc particle-to-particle contact and inefficient discharge performance, especially in high-current applications.
Innovation Solution
The use of a finely dispersed superabsorbent material with substantially uniform, spherical particles of small size in the gelled anode of alkaline electrochemical cells, enhancing electrolyte distribution and access to zinc, thereby improving discharge performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional superabsorbent materials with irregular shape and large particle size are used, then the anode structure is simpler to manufacture, but electrolyte availability is inadequate and discharge performance is reduced
Solution Approach 1:
The patent changes the particle size parameter of superabsorbent material from large (conventional) to small (5-50 micrometers), and changes the shape parameter from irregular to substantially spherical. These parameter changes improve electrolyte distribution and zinc particle contact, enhancing discharge performance while maintaining manufacturing feasibility through controlled precipitation or milling processes
Solution Approach 2:
The patent creates local quality improvements by ensuring uniform distribution of fine spherical superabsorbent particles throughout the anode gel. This local uniformity ensures consistent electrolyte availability at all discharge fronts and zinc particle interfaces, preventing the inadequate electrolyte availability that occurs with large irregular particles
2Quantity of substance
If large particle size superabsorbent materials are used, then material cost is reduced, but zinc particle-to-particle contact is poor and discharge capacity is limited
Solution Approach 1:
The patent changes the particle size parameter to 5-50 micrometers (much smaller than conventional materials) and shape to substantially spherical. This creates sufficient surface area and pore volume to absorb and retain adequate electrolyte throughout the anode, ensuring high electrolyte availability that supports increased discharge capacity without material cost prohibitions
3Ease of manufacture
If irregular shaped superabsorbent particles are used, then manufacturing process is simpler, but discharge uniformity is poor and incomplete discharge occurs
Solution Approach 1:
The patent changes the shape parameter to substantially spherical and particle size to 5-50 micrometers with narrow distribution. This creates uniform packing and consistent electrolyte distribution throughout the anode, ensuring uniform discharge characteristics and preventing incomplete discharge at various sites, while manufacturing can achieve this through controlled precipitation or careful milling and classification
Solution Approach 2:
The patent ensures local quality uniformity by distributing fine spherical particles evenly throughout the anode gel matrix. This local uniformity at the micro-scale ensures consistent electrolyte access and discharge performance across all regions of the cell, achieving the discharge uniformity that cannot be obtained with large irregular particles
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 gelled anode with uniform superabsorbent particles increases electrolyte availability and zinc particle contact, resulting in enhanced discharge capacity and performance, particularly in high-rate discharge scenarios, as demonstrated by improved ANSI discharge performance metrics.
Implementation Method 1
Superabsorbent materials can be used in alkaline cells as electrolyte reservoir sites
Implementation Method 2
The improved gelled anode with uniform superabsorbent particles increases electrolyte availability
Implementation Method 3
The anode metal is provided in an electrolyte solution, such as potassium hydroxide dissolved in water, the electrolyte solution being the ion transfer medium between the anode and cathode
Implementation Method 4
at the anode electrode, hydroxide ions are needed to sustain the following anodic cell reaction: Zn+4OH−→Zn(OH)4−2+2e
Implementation Method 5
2MnO2+2H2O+2e−→2MnOOH+2OH−
Data Source
AI summary
The present disclosure generally relates to an alkaline electrochemical cell comprising an additive for improved discharge performance. The additive is a finely dispersed superabsorbent material comprising particles having a substantially uniform shape and a small particle size relative to typical materials used in alkaline cells. The superabsorbent material results in enhanced discharge performance of the alkaline cell by increasing access of zinc to the electrolyte.