Vanadium Oxide Composite Coating for Conductive Battery Anodes
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Solution Overview
Problem
Existing vanadium oxide-based negative electrode materials for batteries have limitations in electron conductivity and capacity, which hinder their performance in solid-state batteries.
Innovation Solution
A vanadium oxide composite is developed 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 capacity through the use of a carbon material coating and controlled particle size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If vanadium oxide is used as negative electrode material, then capacity is improved, but electron conductivity deteriorates
Solution Approach 1:
The patent applies composite materials by combining vanadium oxide particles with an electrically conductive material to form a coated composite structure. The conductive material coating (30% or more surface coverage) creates a conductive network that compensates for the poor intrinsic conductivity of vanadium oxide, while the vanadium oxide core maintains its high capacity characteristics. This composite approach resolves the contradiction by integrating both high-capacity and high-conductivity materials into a single functional unit.
2Quantity of substance
If particle size is reduced to improve Li insertion/extraction, then capacity is improved, but electron conductivity deteriorates
Solution Approach 1:
The patent applies parameter changes by optimizing the particle size to a specific range (0.5-5.0 μm) and controlling the surface coverage parameter (30% or more). This size optimization balances the advantages of small particles (shorter Li diffusion paths, higher capacity) with the need for sufficient electron conductivity. The specified particle size range ensures that particles are small enough for rapid Li insertion/extraction but large enough to maintain adequate electron transport pathways when coated with conductive material.
3Reliability
If surface coverage by conductive material is increased to improve electron conductivity, then electron conductivity is improved, but manufacturing complexity increases
Solution Approach 1:
The patent applies parameter changes by specifying a threshold value (30% or more surface coverage) that balances conductivity improvement with manufacturing feasibility. This quantitative parameter provides a clear target for manufacturing processes while ensuring sufficient conductive network formation. The parameter is high enough to guarantee adequate electron conductivity but not so high as to require complete encapsulation, which would significantly increase manufacturing complexity and material usage.
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, facilitating Li insertion and extraction, resulting in enhanced charge and discharge characteristics and increased energy density.
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
Data Source
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.