Composite Electrode Particles via Multi-Axis Granulation to Prevent Cracking
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Solution Overview
Problem
Conventional methods for producing granulated particles for electrochemical device electrodes lack improvements in electrode flexibility and cycle characteristics, leading to potential cracking issues and suboptimal performance.
Innovation Solution
A method involving a granulation tank with multiple agitators having different stirring axes is used to stir a powder material, add a binder and solvent composition, and perform particle adjustment to produce composite particles that enhance electrode flexibility and inhibit cracking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional spray drying or fluidized bed granulation methods are used to produce granulated particles, then the electrode mixed material layer can be formed, but the electrode flexibility is insufficient and cracking occurs
Solution Approach 1:
The invention changes the granulation process parameters by using a granulation tank with multiple agitators having different stirring axes and speeds, controlling the addition rate of binder solution, and optimizing the granulation time to produce particles with improved morphology and size distribution that enhance electrode flexibility and prevent cracking
Solution Approach 2:
The invention segments the granulation process into distinct stages: initial mixing of powder materials, controlled addition of binder solution, granulation growth phase, and final maturation phase. This segmented approach with different agitation conditions at each stage produces composite particles with optimized internal structure that improve electrode flexibility and prevent cracking
2Reliability
If conventional granulation methods are used, then granulated particles can be produced, but the cycle characteristics of the electrochemical device are suboptimal
Solution Approach 1:
The invention optimizes cycle characteristics by controlling granulation process parameters including agitation speed, binder addition rate, and granulation time to produce particles with improved density, porosity, and size distribution that enhance both reliability and productivity of the electrochemical device
Solution Approach 2:
The invention uses a slurry composition with controlled viscosity and solvent content that facilitates uniform particle formation and dense packing during granulation, improving the density and electrochemical performance of the electrode while maintaining good cycle characteristics
3Productivity
If uniform dispersion of electrode active material and other components is achieved, then electrochemical device performance is improved, but the manufacturing process becomes more complex
Solution Approach 1:
The invention merges multiple functions into a single granulation tank system that simultaneously performs mixing, granulation, and uniform distribution of all components (electrode active material, conductive material, binder). This integrated approach achieves uniform dispersion and improved electrode performance without requiring separate processing steps, thereby avoiding increased manufacturing complexity
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 method effectively increases electrode flexibility, reduces cracking, and improves the cycle characteristics of electrochemical devices by uniformly dispersing active materials and other components, leading to enhanced performance.
Implementation Method 1
stirring a powder material containing an electrode active material to place the powder material in a stirred state
Implementation Method 2
adding a composition containing a binder and a solvent to the powder material in the stirred state to obtain pre-composite particles
Data Source
AI summary
The following are performed in stated order inside of a granulation tank including two or more agitators having different stirring axes to one another: (i) stirring a powder material containing an electrode active material to place the powder material in a stirred state; (ii) adding a composition containing a binder and a solvent to the powder material in the stirred state to obtain pre-composite particles; and (iii) stirring the pre-composite particles after addition of the composition is complete to perform particle adjustment and obtain composite particles.