Multi-Metal Carbon Oxide Ion Storage Layer for Stable Fast Switching
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Solution Overview
Problem
Vanadium pentoxide-based ion storage materials in electrochromic devices suffer from poor cycle stability and slow color switching speed, especially at high temperatures, limiting the reliability of electrochromic devices.
Innovation Solution
A multi-metal carbon oxide ion storage layer material is prepared by aging a precursor composition of vanadium oxide with additional metal or non-metal oxide precursors in a polar solvent, followed by wet coating and staged baking, forming a multi-metal carbon oxide ion storage layer with improved stability and switching speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If vanadium pentoxide is used as ion storage material, then color switching speed is fast, but charge-discharge cycle stability is poor especially at high temperature
Solution Approach 1:
The patent applies composite materials by combining vanadium oxide with other metal oxides (such as tungsten oxide, molybdenum oxide, or tungsten carbide) to create a composite ion storage material. This composite structure allows the material to inherit the fast color switching speed of vanadium oxide while gaining improved charge-discharge cycle stability from the other metal oxides, thereby resolving the contradiction between speed and reliability.
2Reliability
If doping with metal heteroatoms is performed to improve cycle stability, then charge-discharge cycle stability improves, but color switching speed slows down
Solution Approach 1:
The patent applies local quality by selectively introducing specific metal heteroatoms (such as tungsten, molybdenum, or carbon) into specific positions or regions of the vanadium oxide structure. This localized doping approach allows the material to achieve improved cycle stability at specific sites while preserving the fast color switching capability in the overall structure, thus resolving the contradiction between stability improvement and speed maintenance.
3Temperature
If vanadium pentoxide is used at high temperature, then electrochromic function is maintained, but cycle stability deteriorates rapidly
Solution Approach 1:
The patent applies parameter changes by modifying the chemical composition parameters of the ion storage material through combination with other metal oxides or carbon materials. This compositional parameter change results in a material that maintains its electrochromic function at high temperatures while significantly improving cycle stability, thereby resolving the contradiction between temperature tolerance and high-temperature reliability.
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 multi-metal carbon oxide ion storage layer maintains excellent color switching speed while significantly enhancing charge-discharge cycle stability, suitable for roll-to-roll mass production.
Implementation Method 1
The working principle of the ion storage layer relies on a reversible electrochemical redox reaction, which cooperates with the electrochromic layer to intercalate or de-intercalate counterions to complete reversible color change in the forward or reverse direction.
Implementation Method 2
During the process of counterion intercalation and deintercalation, the ion storage layer undergoes changes in terms of chemical structure and volume.
Data Source
AI summary
A method for making a multi-metal carbon oxide ion storage layer material comprises: mixing a first metal oxide precursor, a second metal or non-metal oxide precursor and a polar solvent thoroughly, and performing special aging treatment at room temperature; and then wet coating the aged solution on a conductive substrate to form a film, and then performing baking treatment to obtain the multi-metal hydrated carbon oxide ion storage layer material.