TMCCC Electrode Pre-Dehydration for Relaxed Electrolyte Drying
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Solution Overview
Problem
The high costs and complexity associated with reducing water impurities in non-aqueous electrolytes for electrochemical cells, particularly those using transition metal cyanide coordination compounds (TMCCC), lead to increased production costs and limitations in battery performance due to stringent drying requirements.
Innovation Solution
Partial dehydration of TMCCC electrodes before assembly allows for relaxed water content specifications in non-aqueous electrolytes, enabling the electrodes to absorb and manage water impurities, thereby optimizing cell performance and reducing manufacturing costs by simplifying processing steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If stringent drying processes are implemented to remove water impurities from non-aqueous electrolytes, then cell performance is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The electrode materials are pre-dehydrated to a controlled residual water content (e.g., 0.1-5% by weight) before cell assembly. This preliminary dehydration action allows the use of non-aqueous electrolytes with higher water content (e.g., 10-1000 ppm) without compromising cell performance, thereby simplifying the overall manufacturing process by eliminating the need for stringent water removal from electrolytes
Solution Approach 2:
The patent converts the previously harmful water impurities in non-aqueous electrolytes into a beneficial feature by using partially dehydrated electrode materials that can tolerate and even benefit from higher water content electrolytes. The residual water in electrodes acts as a buffer, allowing simpler electrolyte purification processes while maintaining cell performance
2Manufacturing precision
If vacuum drying at low pressure is used to remove interstitial water from TMCCC materials, then a single charge-discharge plateau is achieved, but processing time and energy consumption increase
Solution Approach 1:
Instead of completely removing all interstitial water through prolonged vacuum drying, the patent applies partial dehydration by controlling the drying process to achieve a specific residual water content range. This partial action is sufficient to induce the desired phase transition and achieve the single charge-discharge plateau, while significantly reducing processing time and energy consumption compared to complete dehydration
Solution Approach 2:
The patent optimizes drying parameters (temperature, pressure, time) to achieve the desired phase transition more efficiently. By carefully controlling these parameters, the phase transition from cubic to rhombohedral structure is achieved with reduced drying time, balancing manufacturing precision with productivity
3Reliability
If aqueous electrolytes are used in electrochemical cells with TMCCC electrodes, then ionic conductivity is improved, but voltage is limited to prevent water decomposition
Solution Approach 1:
The patent uses composite electrolyte systems that combine aqueous and non-aqueous components, or uses non-aqueous electrolytes with controlled water content in combination with partially dehydrated TMCCC electrodes. This composite approach allows the system to achieve good ionic conductivity while maintaining higher operating voltages above the water decomposition threshold
Solution Approach 2:
The patent changes the water content parameter in the electrolyte system from either purely aqueous or completely anhydrous to an intermediate controlled level. This parameter change allows the electrochemical cell to operate at higher voltages while maintaining sufficient ionic conductivity through the optimized water content in both electrolyte and electrode materials
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 maintains optimal battery performance while reducing production costs by allowing for a wider range of water concentrations in electrolytes and electrodes, enhancing cycle life and rate capability without degrading electrochemical properties.
Implementation Method 1
Partial dehydration of TMCCC electrodes before assembly allows for relaxed water content specifications in non-aqueous electrolytes, enabling the electrodes to absorb and manage water impurities
Implementation Method 2
electrochemical cells including a coordination compound electrochemically active in one or more electrodes
Data Source
AI summary
A system and method for optimizing electrochemical cells including electrodes employing coordination compounds by mediating water content within a desired water content profile that includes sufficient coordinated water and reduces non-coordinated water below a desired target and with electrochemical cells including a coordination compound electrochemically active in one or more electrodes, with an improvement in electrochemical cell manufacture that relaxes standards for water content of electrochemical cells having one or more electrodes including one or more such transition metal cyanide coordination compounds.