Manganese Oxide Cathode Reduces Gas Evolution
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Solution Overview
Problem
Conventional batteries with high surface area cathode materials are prone to gas evolution, leading to potential rupture and leakage, and often require a pre-discharge step that reduces cell capacity and complicates manufacturing.
Innovation Solution
A cathode material with a low BET surface area, specifically a manganese oxide composition characterized by X-ray diffraction peaks at 18, 22, and 32 degrees, is used, which is lithiated and heat-treated in an oxygen atmosphere to enhance electrical performance and reduce gas evolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If high surface area cathode material is used, then electrical performance is improved, but gas evolution increases leading to battery rupture and leakage
Solution Approach 1:
The patent applies parameter changes by controlling the BET surface area of the cathode material to be less than 3.0 m²/g, which is a specific quantitative parameter threshold. This surface area parameter control resolves the contradiction by reducing gas evolution while maintaining sufficient electrical performance through optimized material characteristics rather than simply increasing surface area.
Solution Approach 2:
The patent uses composite materials by combining manganese oxide with specific crystal structures and surface treatments to create a cathode material that achieves low surface area (<3.0 m²/g) while maintaining high electrical performance. The composite nature of the material allows simultaneous optimization of both power delivery and gas evolution resistance.
2Object-affected harmful factors
If pre-discharge step is implemented to control gassing, then gas evolution is reduced, but cell capacity decreases and manufacture becomes complicated
Solution Approach 1:
The patent applies preliminary action by pre-treating the cathode material during manufacturing to achieve the desired low surface area and crystal structure before battery assembly. This preliminary structuring of the material eliminates the need for post-assembly pre-discharge steps, thereby reducing manufacturing complexity while maintaining gassing control.
Solution Approach 2:
The patent extracts the gassing control function from the operational phase (pre-discharge step) and transfers it to the material design phase. By incorporating gassing control properties directly into the cathode material's physical and chemical characteristics, the need for separate control steps is eliminated, simplifying the overall manufacturing process.
3Object-affected harmful factors
If pre-discharge step is used to control gassing, then gas evolution is reduced, but cell capacity is reduced
Solution Approach 1:
The patent applies preliminary action by structuring the cathode material with appropriate crystal phases and surface area during manufacturing, before the battery is assembled or used. This preliminary optimization of material properties achieves gassing control without requiring subsequent pre-discharge steps that would consume capacity, thereby preserving total cell capacity.
4Power
If more cathode active material is used to achieve comparable electrical performance, then electrical performance is maintained, but battery volume increases reducing space for other components
Solution Approach 1:
The patent applies parameter changes by optimizing the cathode material's surface area to a specific range (less than 3.0 m²/g) and controlling its crystal structure. These parameter optimizations improve the material's electrochemical efficiency, allowing smaller amounts of active material to achieve the same electrical performance, thereby reducing overall battery volume.
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 manganese oxide cathode material reduces gas evolution, prevents battery rupture, eliminates the need for a pre-discharge step, and provides enhanced electrical performance with increased capacity and current capability while minimizing material usage.
Implementation Method 1
lithiated and heat-treated in an oxygen atmosphere to enhance electrical performance
Implementation Method 2
heat-treated in an oxygen atmosphere to enhance electrical performance and reduce gas evolution
Implementation Method 3
characterized by X-ray diffraction peaks at 18, 22, and 32 degrees
Data Source
AI summary
Batteries are disclosed. In some embodiments, a battery includes a cathode having a composition that includes a manganese oxide. The composition has an X-ray diffraction pattern with a first peak at about 18 degrees, a second peak at about 22 degrees, and a third peak at about 32 degrees.