Conductive-Coated Vanadium Oxide Composite for Higher Battery Capacity

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Solution Overview

Problem

Existing vanadium oxide-based battery materials, such as Li3VO4, face challenges in achieving high capacity and efficient electron conductivity, limiting their performance in next-generation batteries.

Innovation Solution

A vanadium oxide composite with a specific composition (Li3+x+aV1−xMxO4+a/2) is coated with an electrically conductive material, maintaining 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

VSEngineering 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

Engineering Contradiction:

Improvebattery capacityVSAvoidelectron conductivity

Core Design Contradiction:

Quantity of substanceVSReliability

Solution Approach 1:

The patent applies composite materials by combining Li3+x+aV1−xMxO4+a/2 particles with carbon materials to form a composite negative electrode active material. The carbon material coating layer provides electron conductivity while the vanadium oxide core provides high capacity, resolving the contradiction between capacity and conductivity.

Inventive Principle:

Principle #40Composite materials

2Productivity

If particle size is reduced to improve Li insertion/extraction efficiency, then reaction kinetics improve, but electron conductivity decreases

Engineering Contradiction:

Improvecharge-discharge rateVSAvoidelectron conductivity

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent applies local quality by creating a core-shell structure where the inner core (Li3+x+aV1−xMxO4+a/2) has small particle size for fast Li insertion/extraction, while the outer shell (carbon material) provides electron conductivity. This resolves the contradiction by assigning different properties to different parts of the composite material.

Inventive Principle:

Principle #3Local quality

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 charge and discharge characteristics, increasing battery capacity and power output while maintaining structural integrity.

Implementation Method 1

an electrically conductive material at least partially coating a surface of the particle

Methodology Applied

Scientific EffectElectrical conduction: Conduction (electrical)

Implementation Method 2

facilitating Li insertion and extraction

Methodology Applied

Scientific EffectElectrochemical reaction: Redox Reactions

Data Source

PatentUS20260074207A1Vanadium oxide composite and battery using same

Publication Date: 2026.03.12 PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD

AI summary

A vanadium oxide composite of the present disclosure includes: a particle including a vanadium oxide represented by a composition formula (1) Li3+x+aV1−xMxO4+a/2, and an electrically conductive material at least partially coating a surface of the particle. In the composition formula (1), 0<a<1 and 0≤x<1 are satisfied, and M is at least one element selected from the group consisting of a tetravalent metal element and a tetravalent metalloid element. The vanadium oxide composite has an average particle size of 0.5 μm or more and 5.0 μm or less.