Conductive-Coated Vanadium Oxide Particles for Capacity and Charge Rate
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Solution Overview
Problem
Existing vanadium oxide-based battery materials face challenges in achieving high electron conductivity and capacity due to limitations in particle size and surface coating, which affect charge and discharge characteristics.
Innovation Solution
A vanadium oxide composite with a surface coverage of 30% or more by an electrically conductive material and an average particle size of 0.5 µm to 5.0 µm, enhancing electron conductivity and facilitating Li insertion and extraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the particle size of vanadium oxide is reduced to increase capacity, then the battery capacity is improved, but the electron conductivity deteriorates
Solution Approach 1:
The patent creates a composite material consisting of vanadium oxide particles coated with carbon material. The carbon coating forms a conductive network on the particle surfaces, compensating for the poor electron conductivity that would otherwise result from using fine vanadium oxide particles. This composite structure allows the system to achieve both high capacity (through fine particles) and good conductivity (through carbon coating).
Solution Approach 2:
The carbon material is applied locally on the surface of vanadium oxide particles rather than throughout the bulk material. This surface coating approach maintains the high surface area to volume ratio of fine particles (which provides high capacity) while locally adding conductive properties where electrons need to travel. The carbon coating creates conductive pathways at the particle surfaces and interfaces.
2Reliability
If the surface coverage by electrically conductive material is increased to improve electron conductivity, then the electron conductivity is improved, but the battery capacity deteriorates
Solution Approach 1:
The carbon coating is applied as a thin surface layer rather than as a thick bulk material. This localized surface treatment provides the necessary conductive pathways while minimizing the amount of carbon used, thereby preserving the majority of the vanadium oxide capacity. The coating coverage is optimized to provide sufficient conductivity without excessive material addition.
Solution Approach 2:
The patent optimizes the carbon coating thickness and coverage ratio as critical parameters. By controlling these parameters within specific ranges, the system achieves the minimum necessary conductive pathways while minimizing the volume occupied by non-active carbon material. This parameter optimization balances conductivity improvement against capacity preservation.
3Quantity of substance
If the average particle size is reduced to increase capacity, then the battery capacity is improved, but the charge and discharge characteristics deteriorate
Solution Approach 1:
The carbon-coated vanadium oxide composite addresses the speed limitation by providing continuous conductive pathways on particle surfaces. This conductive network enables faster electron transport to and from the active vanadium oxide sites, compensating for the increased surface area that would otherwise create more interfaces for electron transfer resistance. The result is improved rate capability despite using fine particles.
Solution Approach 2:
The carbon coating is strategically positioned at the particle surfaces where electron transfer occurs during charge and discharge. This localized conductive layer directly addresses the kinetic limitation at the electrode-electrolyte interface, enabling faster reaction rates while maintaining the high surface area of fine particles that provides high capacity.
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 composite improves electron conductivity and battery capacity, enabling better charge and discharge characteristics, particularly when using carbon materials for cost-effective production.
Implementation Method 1
an electrically conductive material at least partially coating a surface of the particle, wherein a surface coverage of the particle by the electrically conductive material is 30% or more
Implementation Method 2
facilitating Li insertion and extraction
Implementation Method 3
Li 3 VO 4 has attracted attention as a next-generation negative electrode active material
Data Source
Figure 1~2
Figure 3~4
AI summary
A vanadium oxide composite of the present disclosure includes: a particle including a vanadium oxide; and an electrically conductive material at least partially coating a surface of the particle. A surface coverage of the particle by the electrically conductive material is 30% or more. The vanadium oxide composite has an average particle size of 0.5 µm or more and 5.0 µm or less.