H-Nb2O5 Electrode Particle Sizing for High-Rate Capacity Retention
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Solution Overview
Problem
Niobium oxide electrodes for lithium-ion batteries suffer from poor electronic conductivity and capacity decay due to pulverization during charge-discharge, limiting their practical application, especially at high charge/discharge rates, and existing methods for improving them are complex and inefficient.
Innovation Solution
The method involves jet milling and classification of H-Nb2O5 to achieve a specific particle size distribution of 2.2-15 µm with a span of <1.90, maintaining the Wadsley-Roth crystal structure, which enhances the electrode's performance as an active material, particularly at high de-lithiation rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional sputtering or evaporation techniques are used to deposit conductive oxide layers, then the electrode can be manufactured, but the manufacturing precision and uniformity of the conductive layer are poor
Solution Approach 1:
The patent replaces conventional mechanical sputtering or evaporation techniques with a chemical bath deposition process. This chemical method allows for more uniform deposition of conductive oxide layers (such as ITO, IZO, or IGZO) on the transparent electrode, improving manufacturing precision and uniformity while maintaining ease of manufacture through simple solution-based processing.
Solution Approach 2:
The patent changes the deposition parameters by using solution-based chemical deposition instead of physical vapor deposition. This involves controlling chemical parameters such as solution concentration, deposition temperature, and deposition time to achieve uniform conductive layers with controlled thickness and conductivity, thereby improving manufacturing precision.
2Reliability
If the transparent electrode layer is made thinner to reduce resistance, then the electrical conductivity improves, but the mechanical strength and stability deteriorate
Solution Approach 1:
The patent uses composite material structures where a thin transparent conductive oxide layer (providing electrical conductivity) is combined with an underlying transparent electrode layer or substrate (providing mechanical strength). This composite approach allows the thin conductive layer to achieve low resistance while the supporting structure maintains mechanical integrity and stability.
Solution Approach 2:
The patent applies different material properties to different layers: the thin conductive oxide layer is optimized for electrical conductivity with minimal thickness, while the underlying electrode or substrate provides the necessary mechanical strength. This local optimization allows the thin layer to achieve good conductivity without compromising overall mechanical stability.
3Manufacturing precision
If multiple processing steps are used to achieve uniform conductive layers, then the manufacturing precision improves, but the productivity decreases
Solution Approach 1:
The patent merges multiple processing steps into a single chemical bath deposition process. Instead of requiring separate sputtering, evaporation, or annealing steps, the chemical deposition method achieves uniform conductive layer formation in one step, thereby improving productivity while maintaining manufacturing precision through controlled chemical reactions.
Solution Approach 2:
The chemical bath deposition process is a self-service method where the deposition occurs automatically through controlled chemical reactions between the solution and substrate. This eliminates the need for complex equipment operation and multiple processing steps, improving productivity while achieving uniform layers through inherent chemical control mechanisms.
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 process improves the capacity and retention of niobium oxide electrodes, enabling their use in high-power batteries with faster charge/discharge capabilities by optimizing particle size and distribution, reducing side reactions, and maintaining structural integrity.
Implementation Method 1
the other electrode is a conductive polymer electrolyte, and the electrochemical reactions between the positive and negative electrodes and the conductive polymer electrolyte serve as charge storage reactions
Implementation Method 2
a positive electrode potential distribution diagram of a lithium-ion battery in a charged state and a negative electrode potential distribution diagram of the lithium-ion battery in the charged state
Data Source
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AI summary
The invention relates to a method of making an electrode, the method comprising: providing a starting H-Nb2O5 material; jet milling and classifying the starting material to provide a processed H-Nb2O5 material having a D50 particle diameter of 2.2-15 μm and a particle size distribution span (D90-D10/D50 of <1.90; and forming an electrode comprising the processed H-Nb2O5 material as an active electrode material.