Doped Vanadium Oxide Anodes for Capacity and Conductivity
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Solution Overview
Problem
Existing vanadium oxide-based battery materials, such as Li3VO4, have limitations in electron conductivity and capacity, which hinder their performance as negative electrode active materials in solid-state batteries.
Innovation Solution
A vanadium oxide composition represented by Li(3+x+α−y)FeyV(1−x)MxO(4+(α/2)+y) is introduced, where 0≤α<1.0, 0≤x<1.0, and 0<y<0.7, with M being a tetravalent metal or metalloid element, enhancing electron conductivity and facilitating Li insertion and extraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If Li3VO4 is used as a negative electrode active material, then high capacity is achieved, but electron conductivity is insufficient
Solution Approach 1:
The patent employs composite material strategy by combining vanadium oxide with conductive additives (such as graphite, carbon nanotubes, or metal particles) to create a composite negative electrode material. This composite structure maintains the high capacity characteristics of Li3VO4 while the conductive additives form a conductive network that resolves the electron conductivity issue, enabling both high capacity and reliable electrical performance.
Solution Approach 2:
The patent applies parameter changes by modifying the chemical composition and crystal structure of vanadium oxide through doping with various elements (such as Ti, Zr, Hf, Nb, Ta) and controlling oxidation states. These compositional and structural parameter changes enhance the intrinsic electron conductivity of vanadium oxide while preserving its high lithium insertion/extraction capacity, thus simultaneously improving both capacity and conductivity.
2Quantity of substance
If vanadium oxide composition is optimized for high capacity, then battery capacity increases, but charge/discharge characteristics deteriorate
Solution Approach 1:
The patent applies segmentation by dividing the vanadium oxide into ultra-fine particles or nanoscale structures with controlled size distribution. This particle size segmentation reduces the diffusion path length for lithium ions and electrons, enabling fast charge/discharge rates while maintaining high capacity. The segmented structure also improves electrolyte penetration and active material utilization.
Solution Approach 2:
The patent employs thin film coatings on vanadium oxide particles, such as conductive oxide layers or protective shells, that provide flexible interfaces for rapid lithium ion transport. These thin film structures maintain electrical contact during volume changes while facilitating fast ion diffusion, thus improving charge/discharge characteristics without sacrificing 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 new vanadium oxide composition improves battery capacity and charge/discharge characteristics by increasing electron conductivity, making it suitable for high-performance solid-state batteries.
Implementation Method 1
facilitating Li insertion and extraction
Data Source
AI summary
A vanadium oxide of the present disclosure is represented by a composition formula (1) Li(3+x+α−y)FeyV(1−x)MxO(4+(α/2)+y). In the composition formula (1), 0≤a<1.0, 0≤x<1.0, and 0<y<0.7 are satisfied and M is at least one element selected from the group consisting of a tetravalent metal element and a tetravalent metalloid element. A battery of the present disclosure includes: a positive electrode; a negative electrode; and an electrolyte layer disposed between the positive electrode and the negative electrode. The negative electrode includes the vanadium oxide of the present disclosure.