Carbon-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 limitations in reaction potential and capacity, and there is a need for improved electron conductivity and battery performance.
Innovation Solution
A vanadium oxide composite with a composition formula Li3+x+aV1−xMxO4+a/2, where 0<a<1 and 0≤x<1, coated with an electrically conductive material, particularly carbon, enhances electron conductivity and facilitates 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 low reaction potential and high capacity are achieved, but electron conductivity is insufficient
Solution Approach 1:
The patent applies composite materials by combining Li3VO4 particles with carbon material to form a composite structure. The carbon material wraps or coats the Li3VO4 particles, creating a composite that maintains the high capacity of Li3VO4 while adding the electron conductivity of carbon, thus resolving the contradiction between capacity and conductivity
Solution Approach 2:
The carbon material acts as an intermediary substance that mediates between the Li3VO4 active material and the electrode current collector. It provides a conductive pathway for electrons to reach the Li3VO4 particles during charge and discharge, enabling the low-conductivity Li3VO4 to function effectively while maintaining its high capacity
2Quantity of substance
If Li3VO4 is used as a negative electrode active material, then high capacity is achieved, but reaction potential is too low
Solution Approach 1:
The patent modifies the parameters of the electrode system by introducing carbon material with different electrochemical properties than Li3VO4. The carbon component provides alternative reaction pathways with different potentials, effectively adjusting the overall reaction potential of the electrode while preserving the high capacity contribution from Li3VO4
3Reliability
If vanadium oxide composite with carbon coating is used, then electron conductivity is improved, but manufacturing complexity increases
Solution Approach 1:
The carbon material is pre-formed into coatings or composite structures before being combined with Li3VO4 particles. This preliminary preparation of conductive carbon structures simplifies the overall manufacturing process compared to attempting to create conductivity through complex post-processing or electrode design modifications
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 battery capacity and charge/discharge characteristics by facilitating Li ion transport, offering enhanced electron conductivity and cost-effective production.
Implementation Method 1
an electrically conductive material at least partially coating a surface of the particle
Implementation Method 2
facilitates Li insertion and extraction
Data Source
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.