Hierarchical Oxygen-Containing Carbon Anode for Fast-Charging Li-Ion Batteries
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Solution Overview
Problem
Current anode materials for lithium-ion batteries fail to simultaneously achieve high capacity, fast chargeability, and long cyclability, limiting their application in high energy and power storage systems.
Innovation Solution
A hierarchical oxygen-containing carbon anode material with larger interlayer spaces and functional groups is developed, featuring oxygen distribution from the surface to a 15 nm depth, combined with porous graphene coating for enhanced conductivity and capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If graphite is used as anode material, then low cost and long cycle life are achieved, but capacity is limited
Solution Approach 1:
The patent applies local quality by creating a non-uniform oxygen distribution within the graphite particle structure. Oxygen-containing functional groups are concentrated in the size range of 5-50 nm, particularly at particle surfaces and interfaces, while the bulk graphite structure remains intact. This localized modification enables high capacity through additional lithium storage sites without compromising the overall structural stability required for long cycle life.
2Speed
If larger interlayer spaces are created, then fast charging capability is improved, but structural stability deteriorates
Solution Approach 1:
The patent utilizes porous materials by introducing oxygen-containing functional groups that create nanoscale pores and channels (5-50 nm) within the graphite structure. These pores facilitate rapid lithium ion diffusion and transport, enabling fast charging capability. The porous structure is integrated within the graphite lattice, maintaining structural integrity through the controlled distribution of oxygen groups rather than creating large voids that would compromise stability.
3Quantity of substance
If oxygen-containing functional groups are added, then capacity and rate capability are improved, but manufacturing complexity increases
Solution Approach 1:
The patent applies parameter changes by precisely controlling the size distribution (5-50 nm) and concentration of oxygen-containing functional groups during the oxidation process. By optimizing parameters such as oxidation time, temperature, and acid concentration, the method achieves the desired functional group distribution while maintaining a relatively simple wet chemical oxidation process. This parameter optimization enables high capacity and rate capability without requiring complex multi-step synthesis procedures.
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 solution provides a high-capacity, fast chargeable anode material with improved rate capability and cyclability, suitable for large-scale energy storage systems like electric vehicles.
Implementation Method 1
graphite phase with an interlayer space d002 larger than 0.3357 nm
Implementation Method 2
porous graphene covered carbon material
Data Source
AI summary
An anode material for a lithium ion battery, comprising an oxygen-containing carbon where oxygen is in the form of functional groups, the oxygen being distributed gradient from the surface to the inside of the carbon, and the carbon having an interlayer space d002 larger than 0.3357 nm; and a porous graphene layer covering the oxygen-containing carbon, the graphene being in the form of monolayer or few-layer graphene.