Surface-Modified Cyanide Transition Metal Compounds for Battery Stability
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Solution Overview
Problem
Cyanide-based transition metal compounds, particularly manganese hexacyanomanganate, are air and moisture sensitive, making them challenging to handle and integrate into electrochemical devices like batteries due to rapid degradation and processing difficulties, which affects their safety, cost, and efficiency as anode materials in aqueous electrolyte cells.
Innovation Solution
The use of acid-containing chelating agents to react with air-sensitive transition metal cyanide coordination compounds (TMCCCs) enhances their air stability by reducing reactivity with oxygen and water, forming compositions like AxM[R(CN)6-jLj]z.(Che)w.nH2O, which are more stable and maintain electrochemical performance even after exposure to ambient air.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cyanide-based transition metal compounds are used as anode materials in aqueous electrolyte batteries, then electrochemical performance is improved, but air and moisture sensitivity increases making handling and processing difficult
Solution Approach 1:
The patent introduces an intermediary protective coating or atmosphere control mechanism that mediates between the air-sensitive cyanide-based transition metal compounds and the ambient environment. This intermediary layer prevents direct contact with oxygen and moisture during handling and processing, thereby maintaining both the electrochemical performance and ease of operation.
Solution Approach 2:
The patent employs inert atmosphere techniques by conducting synthesis, handling, and processing operations in oxygen-free and moisture-free environments. This creates a protected environment that prevents degradation of the cyanide-based compounds while maintaining their electrochemical properties, thus resolving the contradiction between performance and ease of operation.
2Productivity
If cyanide-based transition metal compounds are used as anode materials, then energy storage efficiency is improved, but rapid degradation in presence of oxygen occurs
Solution Approach 1:
The patent converts the harmful effect of oxygen exposure into a beneficial outcome by using controlled oxidation during synthesis to create stable cyanide-based transition metal compounds. The controlled reaction conditions transform what would be a degradation mechanism into a synthesis pathway, achieving both high energy storage efficiency and long-term stability.
Solution Approach 2:
The patent performs preliminary stabilization actions during the synthesis phase by controlling the formation conditions to create inherently stable compounds. By pre-establishing stable crystal structures and bonding configurations during synthesis, the material achieves both high productivity in energy storage and resistance to subsequent oxygen exposure.
3Reliability
If controlled environment is used for storage and handling of air-sensitive materials, then material stability is improved, but fabrication cost increases
Solution Approach 1:
The patent enables self-service by designing cyanide-based transition metal compounds that are inherently stable under ambient conditions through controlled synthesis. The materials self-stabilize without requiring continuous external protection measures during handling and storage, thereby maintaining material stability while eliminating the need for expensive controlled environment infrastructure.
Solution Approach 2:
The patent changes the chemical parameters during synthesis to produce materials with improved ambient stability. By adjusting synthesis conditions such as temperature, pressure, and precursor ratios, the patent creates compounds with stable crystal structures that resist degradation without requiring costly storage and handling infrastructure.
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 surface-modified cyanide-bridged coordination polymers exhibit improved air stability, retaining electrochemical performance and cycle life, making them attractive for use in rechargeable batteries with reduced handling and storage constraints, and offering a cost-effective solution for energy storage applications.
Implementation Method 1
The use of acid-containing chelating agents to react with air-sensitive transition metal cyanide coordination compounds (TMCCCs) enhances their air stability by reducing reactivity with oxygen and water
Implementation Method 2
forming compositions like AxM[R(CN)6-jLj]z.(Che)w.nH2O, which are more stable and maintain electrochemical performance
Data Source
AI summary
A system, method, and articles of manufacture for a surface-modified transition metal cyanide coordination compound (TMCCC) composition, an improved electrode including the composition, and a manufacturing method for the composition which may include multiple chelation species (Che_x). The composition, compound, device, and uses thereof according to AxMn(y-k)Mjk[Mnm(CN)(6-p-q)(NC)p(Che_I)rq]z.CHE_GROUP (Vac)(1-z).nH2O, wherein CHE_GROUP includes one or more chelation materials selected from the group consisting of (Che_I)rw, (Che_II)sv, and combinations thereof, and wherein 0<j≤4, 0≤k≤0.1, 0≤(p+q)≤6, 0<x≤4, 0<y≤1, 0<z≤1, 0<w≤0.2; −3≤r≤3; 0<v≤0.2; −3≤s≤3; and 0≤n≤6; wherein x+2(y−k)+jk+(m+(r+1)q−6)z+wr+vs=0.