Silicon Anion Receptor Electrolyte for Stable LiPF6 Conductivity
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Solution Overview
Problem
Current anion receptors, such as aza-ethers, face limitations in solubility and electrochemical stability, particularly with LiPF6, and solid polymer electrolytes have low ionic conductivity due to high crystallinity, which hinders their application in lithium batteries.
Innovation Solution
A novel silicon-based anion receptor is introduced, featuring an amine group with an electron-withdrawing functional group as a substituent or an electron-withdrawing group on a nitrogen atom, enhancing ionic conductivity and electrochemical stability, and a solidifying electrolyte that hardens at elevated temperatures to prevent thermal runaway.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If aza-ether anion receptors are used, then anion stability is improved through Lewis acid-base interaction, but solubility in polar solvents deteriorates and electrochemical stability window cannot satisfy 4.0 V requirement
Solution Approach 1:
The patent changes the chemical structure parameters of the anion receptor by replacing the traditional aza-ether nitrogen atom with a silicon atom containing an amine group substituent. This structural parameter change enables the receptor to maintain anion binding capability while improving solubility in polar solvents and expanding the electrochemical stability window to satisfy 4.0 V requirements for commercial cathode materials.
Solution Approach 2:
The patent creates a composite structure by combining silicon atom, amine group, and electron-withdrawing functional groups into a novel anion receptor molecule. This composite molecular structure integrates the advantages of different components: silicon provides the core framework, amine group enables anion interaction, and electron-withdrawing groups enhance stability and solubility properties.
2Reliability
If aza-ether anion receptors are used, then anion interaction capability is improved, but chemical and thermal stability deteriorates due to reaction with LiPF6
Solution Approach 1:
The patent changes the chemical composition parameters by substituting the aza-ether structure with a silicon-based amine structure. This parameter change fundamentally alters the chemical reactivity profile, making the anion receptor resistant to decomposition by LiPF6 while maintaining the ability to interact with anions through the amine group's lone pair electrons.
3Ease of manufacture
If polyethylene oxide-based solid polymer electrolytes are used, then ease of manufacture is improved, but ionic conductivity deteriorates due to high crystallinity
Solution Approach 1:
The patent creates a composite solid polymer electrolyte by combining polyethylene oxide matrix with the novel silicon-based anion receptor and lithium salt. This composite structure maintains the ease of manufacture from PEO while the anion receptor components disrupt crystallinity and enhance ionic conductivity through improved ion transport pathways.
Solution Approach 2:
The patent introduces local quality changes by incorporating the silicon-based anion receptor at specific locations within the polymer matrix. These localized regions with enhanced ionic conductivity create percolation pathways that improve overall electrolyte performance while maintaining the bulk properties of the PEO matrix for ease of manufacture.
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 silicon-based anion receptor improves ionic conductivity and electrochemical stability, ensuring safer battery operation by preventing thermal runaway and enhancing the performance of lithium batteries.
Implementation Method 1
the nitrogen atom can properly interact with electron-rich anions through Coulomb attraction
Implementation Method 2
an amine group having an electron withdrawing functional group as a substituent introduced into a silicon atom or an electron withdrawing functional group introduced into a nitrogen atom in a ring
Implementation Method 3
a solidifying electrolyte that hardens at elevated temperatures to prevent thermal runaway
Data Source
AI summary
The present disclosure relates to a novel anion receptor and an electrolyte including the same. More particularly, the present disclosure relates to a compound as a novel anion receptor, an electrolyte composition including the same compound, and an electrolyte including the same compound. The present disclosure also relates to a battery using the electrolyte and to a recycle battery using the electrolyte.