Potassium Battery Electrolyte Composition for Nonflammable SEI Formation
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Solution Overview
Problem
Certain battery electrolytes exhibit flammability and evolve unwanted byproducts, necessitating the development of improved electrolytes for potassium batteries.
Innovation Solution
A nonflammable electrolyte comprising potassium hexafluorophosphate, cyclic carbonate, and organic phosphate, specifically ethylene carbonate, propylene carbonate, and trimethyl phosphate, is developed, along with a method to mitigate the effects of byproducts such as HF, HPO2F2, and phosphates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional battery electrolytes are used, then ionic conductivity is achieved, but flammability and unwanted byproduct evolution occur
Solution Approach 1:
The patent converts the harmful flammability of conventional electrolytes into a benefit by using phosphate esters that decompose endothermically to release protective phosphoric acid, transforming the harmful property into a protective mechanism that forms stable SEI layers and suppresses further decomposition
Solution Approach 2:
The patent employs composite electrolyte formulations combining phosphate esters with cyclic carbonates and chain carbonates, creating a multi-component system where each component contributes specific properties: phosphate esters provide safety and SEI formation, cyclic carbonates enhance ionic conductivity, and chain carbonates improve solubility and stability
2Reliability
If flammable electrolytes are used, then good ionic conductivity is achieved, but safety is compromised
Solution Approach 1:
The patent changes the chemical composition parameters of the electrolyte by introducing phosphate esters with specific molecular structures and ratios, adjusting the balance between safety and ionic conductivity through controlled composition variations while maintaining optimal performance
3Productivity
If conventional electrolytes are used, then charge transfer is achieved, but unwanted byproducts are evolved
Solution Approach 1:
The patent applies preliminary anti-action by having phosphate esters decompose first during initial cycling to form protective SEI layers that prevent subsequent decomposition reactions, thereby preemptively blocking the formation of harmful byproducts like HF and phosphates during normal operation
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 electrolyte provides enhanced safety and performance by reducing flammability, improving ionic conductivity, and forming a stable solid electrolyte interface (SEI) that enhances capacity retention and charge transfer in potassium batteries.
Implementation Method 1
improving ionic conductivity
Implementation Method 2
forming a stable solid electrolyte interface (SEI)
Data Source
AI summary
An electrolyte, comprising: an amount of potassium hexafluorophosphate; at least one cyclic carbonate, the at least one cyclic carbonate optionally comprising at least one of ethylene carbonate and propylene carbonate; and at least one organic phosphate, the at least one organic phosphate optionally comprising at least one of trimethyl phosphate and triethyl phosphate. An electrical cell, comprising: the electrolyte according to the present disclosure, and an electrode, the electrode contacting the electrolyte. A method, comprising: any one or more of separating, disposing, or at least partially neutralizing any one or more of HF, HPO2F2, H2PO3F, an organofluorophosphate, a monofluorophosphate, an organophosphate, and a phosphonate evolved from operating an electrical cell that includes as an electrolyte any one or more of LiPF6, NaPF6, and KPF6.