Artificial Graphite Surface Oxidation for Higher Electrode Compaction
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Solution Overview
Problem
Existing graphite materials for battery electrodes have low compaction density, which limits the energy density and stability of batteries, particularly in electric vehicles, due to their two-dimensional structure and surface defects caused by treatments like acid or alkali etching.
Innovation Solution
A method of heat-treating graphite raw materials in a mixed gas atmosphere with oxygen or water vapor, while in a motion state, to modify the surface and improve compaction density, involving controlled temperature and duration, and using specific carbon sources like petroleum coke to enhance graphitization and particle morphology.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of stationary object
If graphite raw material is heat-treated in a mixed gas atmosphere with oxygen or water vapor while in a motion state, then the compaction density of artificial graphite is improved, but the process complexity increases
Solution Approach 1:
The graphite raw material is maintained in a motion state (fluidizing or tumbling) during heat treatment, which enhances surface modification uniformity and improves compaction density without requiring complex equipment changes
Solution Approach 2:
The heat treatment uses a mixed gas atmosphere containing oxygen or water vapor at controlled concentrations (5-40% oxygen or 10-60% water vapor) at temperatures of 400-900°C, modifying the surface properties of graphite to improve compaction density
2Volume of stationary object
If the heat treatment temperature and duration are increased to improve graphitization, then the compaction density improves, but the energy consumption increases
Solution Approach 1:
The patent optimizes the heat treatment parameters to a temperature range of 400-900°C for 10-60 minutes, which achieves effective surface modification and improved compaction density while avoiding excessive energy consumption associated with higher temperatures or longer durations
3Manufacturing precision
If the graphite raw material is kept in a motion state during heat treatment, then the surface modification effect is improved, but the process control difficulty increases
Solution Approach 1:
The graphite raw material is maintained in a motion state (fluidizing or tumbling) during heat treatment, which enhances surface modification uniformity and improves compaction density without requiring complex equipment changes
Solution Approach 2:
The motion state of the graphite particles themselves serves the dual purpose of enhancing heat treatment effectiveness and ensuring uniform surface modification, eliminating the need for additional complex control mechanisms
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 significantly increases the compaction density of artificial graphite, leading to higher energy density, improved cycle performance, and enhanced stability of battery electrodes, addressing the limitations of existing graphite treatments.
Implementation Method 1
heat-treating a graphite raw material to obtain artificial graphite, where an ambient atmosphere of the heat treatment is a mixed gas including a gas that is at least one of oxygen or water vapor
Implementation Method 2
heat-treating a graphite raw material to obtain artificial graphite, where the heat treatment is performed at a temperature of 400° C. to 900° C.
Implementation Method 3
during the heat treatment, the graphite raw material is in a motion state... the motion state is at least one of a continuous fluidizing state or a tumbling state
Data Source
AI summary
A preparation method of an artificial graphite includes heat-treating a graphite raw material to obtain artificial graphite, where an ambient atmosphere of the heat treatment is a mixed gas including a gas that is at least one of oxygen or water vapor and including a chemically inert gas, and, during the heat treatment, the graphite raw material is in a motion state.