H2-xV3O8 Battery Electrode Material Oxidation Stability
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Solution Overview
Problem
Current rechargeable batteries using H2V3O8 as active material face issues with limited chemical stability, leading to poor electrochemical stability and capacity reduction over time due to volume changes and proton exchange, causing corrosion and electrolyte poisoning.
Innovation Solution
The development of H2-xV3O8 active material, where x is between 0.01 and 0.99, achieved by oxidizing H2V3O8 in the presence of an oxidizing agent at controlled temperatures, maintains the orthorhombic lattice structure and enhances chemical stability, increasing capacity and electrochemical stability over repeated charging/discharging cycles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If H2V3O8 is used as active material, then high capacity and high rate capability are achieved, but chemical stability is limited leading to poor electrochemical stability over time
Solution Approach 1:
The patent removes exchangeable protons from the H2V3O8 structure by oxidizing it to form H2-xV3O8 (where x is between 0.01 and 0.99). This extraction of harmful protons eliminates their corrosive effects while preserving the beneficial high-capacity vanadium oxide framework, thereby improving electrochemical stability without sacrificing capacity.
Solution Approach 2:
The patent changes the hydrogen content parameter in the H2V3O8 structure by controlling the oxidation process to achieve H2-xV3O8 with specific x values. This parameter modification reduces the number of exchangeable protons from 2 per formula unit to fewer than 2, fundamentally altering the material's chemical stability while maintaining its electrochemical performance.
2Quantity of substance
If protons are exchanged in H2V3O8, then capacity is increased, but volume changes damage the material structure over time
Solution Approach 1:
The patent extracts exchangeable protons from the H2V3O8 structure through oxidation to create H2-xV3O8. By removing these protons that cause volume changes and structural damage during cycling, the material maintains its structural integrity while retaining high capacity for alkali metal ion insertion.
Solution Approach 2:
The patent performs oxidation treatment beforehand to create H2-xV3O8 with reduced proton content before the material is used in battery cycling. This pre-treatment cushions against future structural damage by eliminating the source of volume changes and structural degradation that would occur during repeated charging/discharging cycles.
3Use of energy by moving object
If H2V3O8 is used, then high energy density is achieved, but proton exchange causes corrosion and electrolyte poisoning
Solution Approach 1:
The patent converts the harmful effect of protons by oxidizing H2V3O8 to H2-xV3O8, thereby removing the exchangeable protons that cause corrosion and electrolyte poisoning. This transformation eliminates the harmful factors while preserving the beneficial high energy density properties of the vanadium oxide structure.
Solution Approach 2:
The patent extracts and removes the harmful exchangeable protons from the H2V3O8 structure through controlled oxidation. By taking out these protons that cause corrosion and electrolyte degradation, the material maintains its high energy density capability without the associated harmful side effects.
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 H2-xV3O8 active material exhibits improved chemical inertness and higher electrochemical stability, maintaining capacity and reducing vanadium dissolution, resulting in a more stable battery performance over time.
Implementation Method 1
The active material comprises H2-xV3O8, wherein x is between 0.01 and 0.99... obtained by oxidizing H2V3O8 in the presence of an oxidizing agent at controlled temperatures
Implementation Method 2
H2V3O8 is capable to reversibly exchange large amounts of alkali metals ions and transition metals ions, in particular lithium (Li)... to intercalate
Data Source
AI summary
An active material for an electrode for a battery cell, wherein the active material comprises H2-xV3O8, wherein x is between 0.01 and 0.99. Also, a method for producing an active material for an electrode comprising a step of oxidation of H2V3O8, thereby obtaining H2-xV3O8, wherein x is between 0.01 and 0.99, as the active material, wherein the oxidation is performed at a temperature between 80° C. and 150° C., preferably between 100° C. and 130° C.