Graphite Shaping and Carbon Coating to Reduce Exfoliation
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Solution Overview
Problem
Conventional methods for shaping and coating graphite for use in lithium-ion batteries are inefficient, requiring multiple steps and high energy usage, and do not effectively address issues such as graphite exfoliation and impurity removal.
Innovation Solution
A single-step process using a shaping and coating machine that combines particle shaping and coating in a batch process, utilizing solid-phase powder coating materials and mechanical forces to form spherical graphite particles with a carbon coating, optimizing energy efficiency and impurity removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional multi-step methods are used for shaping and coating graphite, then coating can be applied to graphite particles, but the process requires multiple steps and high energy usage
Solution Approach 1:
The patent combines shaping and coating operations into a single integrated process step using a shaping and coating machine. Graphite particles are shaped into spheres and coated with carbon material simultaneously in one batch process, eliminating the need for separate shaping and coating steps that would require multiple equipment units and higher energy consumption.
Solution Approach 2:
The shaping and coating machine performs multiple functions (shaping and coating) within a single device. The machine can process graphite particles through both shaping and coating operations in sequence within the same chamber, making the equipment universal and reducing the need for multiple specialized machines.
2Shape
If conventional methods are used for shaping graphite, then graphite can be shaped into spheres, but the process does not effectively address graphite exfoliation and impurity removal
Solution Approach 1:
The shaping process is performed before coating in the same batch process. Graphite particles are first shaped into spheres, then immediately coated with carbon material while still in the shaping chamber. This preliminary shaping followed by immediate coating prevents exfoliation that would occur if shaped particles were handled and transported to separate coating equipment.
Solution Approach 2:
The carbon coating material acts as an intermediary protective layer applied to the shaped graphite particles. This coating layer prevents exfoliation of the graphite structure during subsequent battery manufacturing processes while maintaining the spherical shape achieved in the shaping step.
3Ease of manufacture
If multiple process steps are used for shaping and coating, then both operations can be performed, but production time is increased
Solution Approach 1:
Both shaping and coating operations are merged into a single batch process executed in one machine. The controller manages the sequence of operations (shaping phase followed by coating phase) within the same processing cycle, eliminating the time required to transfer materials between separate shaping and coating equipment and reducing total production time.
Solution Approach 2:
The shaping and coating operations proceed continuously in sequence within the same batch process without interruption. After shaping is complete, the same graphite particles immediately undergo coating in the same chamber, maintaining continuous useful action and eliminating idle time between operations that would occur with separate batch processes.
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 process enhances the performance and lifespan of lithium-ion batteries by reducing exfoliation and improving tap density, while minimizing energy consumption and production time.
Implementation Method 1
rotating the graphite particles at a first speed for a first length of time in the chamber to form Spherical Purified Graphite (SPG) particles
Implementation Method 2
rotating the first powder coating material and the SPG particles at a second speed and for a second length of time in the same chamber to form Coated Spherical Purified Graphite (CSPG) particles
Data Source
AI summary
Devices, methods, products, and systems for shaping and coating graphite are disclosed. The method includes providing a volume of purified graphite particles in a chamber of a shaping and coating machine, rotating the volume of purified graphite particles at a first speed for a first length of time in the chamber to form Spherical Purified Graphite (SPG) particles, providing a first powder coating material in the chamber of the shaping and coating machine, and rotating the first powder coating material and the SPG particles at a second speed and for a second length of time in the chamber to form Coated Spherical Purified Graphite (CSPG) particles.