Alkaline Battery Cathode Composite Manganese Dioxide
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Solution Overview
Problem
Alkaline batteries with single cathode active materials, such as λ-MnO2, have limitations in discharge performance and capacity, and existing blends or composites do not fully optimize the combination of cathode active materials to enhance both low and high-rate discharge capabilities and capacity retention.
Innovation Solution
A battery cathode comprising a blend or composite of λ-MnO2 with additional cathode active materials like acid-treated EMD, ozone-treated EMD, nickel oxides, and delithiated lithium nickel oxides, which are mechanically or chemically mixed to improve packing density and synergistic discharge performance, and a method of manufacturing involving milling and acid treatment to form a composite.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single cathode active material (λ-MnO2) is used, then the battery structure is simple and manufacturing is easier, but the discharge performance and capacity are limited
Solution Approach 1:
The patent applies composite materials by combining λ-MnO2 with other cathode active materials (such as γ-MnO2, EMG, or other metal oxides) to create a composite cathode structure. This composite approach enhances discharge performance and capacity while managing the increased structural complexity through systematic material integration.
2Productivity
If cathode active materials are blended or composited, then discharge capacity and voltage are improved, but manufacturing process complexity increases
Solution Approach 1:
The patent merges multiple cathode active materials into a blended or composite structure, combining the advantages of each material (high capacity, stable voltage, good kinetics) to achieve superior overall discharge performance while integrating them into a unified cathode assembly.
Solution Approach 2:
The patent optimizes manufacturing by controlling particle size parameters through milling processes and adjusting the compositional ratios of different cathode materials. These parameter changes enable improved discharge capacity while managing manufacturing complexity through systematic process control.
3Speed
If particle size is reduced through milling, then reaction kinetics and discharge rate performance improve, but manufacturing time and energy consumption increase
Solution Approach 1:
The patent applies partial milling or controlled size reduction to achieve sufficient particle size optimization for improved discharge rate performance without subjecting all materials to excessive milling that would unnecessarily increase manufacturing time and energy consumption. The milling is applied selectively to achieve the required kinetic performance.
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 battery exhibits enhanced gravimetric discharge capacity, improved closed circuit voltage, and capacity retention at both low and high discharge rates, with the ability to replace or supplement commercial alkaline cells' cathode active materials, offering improved performance and potentially lower manufacturing costs.
Implementation Method 1
The negative electrode contains an electroactive material (such as zinc or zinc alloy particles) that can be oxidized; and the positive electrode contains an electroactive material (such as a manganese dioxide) that can be reduced. The active material of the negative electrode is capable of reducing the active material of the positive electrode.
Implementation Method 2
An electrolyte solution in contact with both electrodes contains ions that diffuse through the separator between the electrodes to maintain electrical charge balance throughout the battery during discharge.
Data Source
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Figure 2A~2B
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AI summary
A primary battery includes a cathode having a cathode active material including a blend or composite of ? -MnO2 and one or more additional cathode active materials, an anode, a separator between the cathode and the anode, and an alkaline electrolyte.