Vanadium Molybdenum Oxide Cathode Room-Temperature Manufacturing
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Solution Overview
Problem
Lithium secondary batteries face limitations in charge/discharge capacity, output characteristics, and lifespan performance due to the use of vanadium oxides as positive electrode materials, which also pose challenges in manufacturing on polymer materials and require complex high-temperature vacuum processes for doping with molybdenum.
Innovation Solution
A method involving the reaction of vanadium oxide with a water-soluble molybdenum-based compound in the presence of a solvent, followed by thermal treatment, to create a positive electrode material with substituted molybdenum, maintaining the orthorhombic crystal structure and improving lithium ion diffusion pathways.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If vanadium oxide is used as positive electrode material, then the battery can be manufactured at room temperature on polymer materials, but the charge/discharge capacity, output characteristics, and lifespan performance are insufficient
Solution Approach 1:
The patent applies composite materials by combining vanadium oxide with molybdenum oxide to form a doped composite structure (V1-xMoxO5). This composite approach allows the material to maintain the room-temperature manufacturing advantage of vanadium oxide while incorporating molybdenum oxide to enhance charge/discharge capacity, output characteristics, and lifespan performance, thus resolving the contradiction between ease of manufacture and reliability.
Solution Approach 2:
The patent employs parameter changes by doping vanadium oxide with molybdenum oxide at controlled ratios (0 < x < 1) to modify the material's electrochemical properties. This parameter adjustment enables the positive electrode material to achieve improved charge/discharge capacity and output characteristics while maintaining compatibility with room-temperature polymer substrate manufacturing processes.
2Reliability
If molybdenum doping is performed using conventional vacuum doping method, then the charge/discharge capacity is improved, but the manufacturing process becomes complex and requires high temperature vacuum equipment
Solution Approach 1:
The patent replaces the complex mechanical vacuum doping system with a simpler chemical mixing approach. Instead of using high-temperature vacuum equipment for molybdenum doping, the invention directly mixes molybdenum oxide with vanadium oxide in predetermined ratios, followed by simple thermal treatment. This substitution dramatically reduces device complexity while maintaining improved charge/discharge capacity.
Solution Approach 2:
The patent changes the doping process parameters from high-temperature vacuum conditions to low-temperature atmospheric mixing and thermal treatment. By altering the temperature and pressure parameters, the manufacturing process becomes simpler and less equipment-intensive while still achieving effective molybdenum doping and improved battery performance.
3Quantity of substance
If LiCoO2 is used as positive electrode material, then the operating voltage and capacity are high, but the material is expensive, has low charge/discharge current capacity, and exhibits safety risks at high voltage
Solution Approach 1:
The patent uses composite materials by combining vanadium oxide and molybdenum oxide to create a new positive electrode material (V1-xMoxO5) that offers an alternative to LiCoO2. This composite material provides competitive operating voltage and capacity while eliminating the high cost, safety risks, and current capacity limitations associated with LiCoO2, thus resolving the technical contradiction.
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
This approach enhances the charge/discharge capacity, output characteristics, and lifespan performance of lithium secondary batteries while allowing for a room-temperature manufacturing process on polymer materials, avoiding the complexities of high-temperature vacuum doping methods.
Implementation Method 1
reacting a vanadium oxide with a water-soluble molybdenum-based compound in the presence of a solvent
Implementation Method 2
thermally treating the reaction product
Implementation Method 3
maintaining the orthorhombic crystal structure
Implementation Method 4
improving lithium ion diffusion pathways
Data Source
AI summary
A positive electrode material for lithium secondary batteries capable of easily doping vanadium oxide with molybdenum, and a method of manufacturing the same are disclosed. The method of manufacturing a positive electrode material for lithium secondary batteries includes (a) reacting vanadium oxide with a water-soluble molybdenum-based compound in the presence of a solvent; and (b) thermally treating the reaction product of (a).