Positive Electrode Material Heating to Prevent Particle Adhesion
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Solution Overview
Problem
The productivity and performance of positive electrode active materials in lithium-ion secondary batteries are hindered by high costs, structural instability during charge and discharge cycles, and the need for improved safety and reliability.
Innovation Solution
A method involving the use of a rotary kiln or similar heating apparatus with adhesion-preventing steps, such as stirring or vibration, to form positive electrode active materials composed of lithium, transition metals, and fluorine, with controlled heating and atmosphere conditions to prevent particle adhesion and enhance crystal structure stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional heating methods are used to form positive electrode active material, then the material can be produced, but particle adhesion occurs reducing productivity and performance
Solution Approach 1:
The patent applies mechanical vibration to the heating apparatus during the heating process to prevent particle adhesion. The vibration disrupts the formation of adhered particles between the positive electrode active material particles and the heating apparatus surface, thereby maintaining productivity and performance while enabling continuous production.
Solution Approach 2:
The patent introduces dynamic motion (vibration) to the heating apparatus, transforming it from a static heating device to a dynamic one. This dynamic approach allows the system to actively prevent particle adhesion during heating, resolving the contradiction between maintaining productivity and preventing harmful adhesion effects.
2Stability of the object's composition
If heating temperature and time are increased to improve material formation, then crystal structure stability improves, but particle adhesion increases reducing productivity
Solution Approach 1:
The patent uses mechanical vibration during heating to enable longer heating times and higher temperatures without particle adhesion. The vibration prevents adhesion while the extended heating duration improves crystal structure stability, thus resolving the contradiction between stability improvement and productivity maintenance.
Solution Approach 2:
The patent enables continuous heating action over extended periods by preventing particle adhesion through vibration. This continuous useful action allows the material to undergo充分的 crystal structure development while maintaining productivity, as the vibration prevents adhesion that would otherwise interrupt the heating process.
3Manufacturing precision
If conventional batch processing is used, then material quality can be controlled, but productivity remains low
Solution Approach 1:
The patent transforms batch processing into a continuous processing method by preventing particle adhesion during heating. The vibration mechanism allows continuous material flow and heating without interruption from adhesion issues, thereby improving productivity while maintaining quality control through consistent heating conditions.
Solution Approach 2:
The patent introduces dynamic vibration to the heating process, enabling continuous operation rather than static batch processing. This dynamic approach maintains manufacturing precision through controlled vibration parameters while significantly improving productivity by eliminating adhesion-related interruptions.
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 approach enhances the productivity, cycle performance, and safety of the positive electrode active materials, resulting in secondary batteries with higher charge and discharge capacity and reliability.
Implementation Method 1
heating an object to a temperature of 500° C. or higher
Implementation Method 2
An adhesion preventing step is performed during heating of an object
Data Source
AI summary
To provide a method of forming a positive electrode active material with high productivity. To provide a manufacturing apparatus capable of forming a positive electrode active material with high productivity. Provided is a method of forming a positive electrode active material including lithium, a transition metal, oxygen, and fluorine. An adhesion preventing step is performed during heating of an object. Examples of the adhesion preventing step include stirring by rotating a furnace during the heating, stirring by vibrating a container containing an object during the heating, and crushing performed between the plurality of heating steps. By these manufacturing methods, a positive electrode active material having favorable distribution of an additive at the surface portion can be formed.