Silazane Anion Receptor Electrolytes for Stable Lithium-Ion Conduction
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Solution Overview
Problem
Existing anion receptors, such as aza-ethers, suffer from limited solubility in polar solvents and electrochemical instability, leading to poor performance in lithium batteries, while solid polymeric electrolytes have low ionic conductivity at room temperature, restricting their use in commercial applications.
Innovation Solution
Development of silazane-based anion receptor compounds with electron-withdrawing groups substituted into silicon or nitrogen atoms, enhancing ionic conductivity and electrochemical stability, and a solidifying electrolyte that cures at high 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 interactions, but solubility in polar solvents deteriorates and electrochemical stability deteriorates
Solution Approach 1:
The patent modifies the molecular structure parameters of anion receptors by replacing aza-ether oxygen atoms with silazane nitrogen atoms and introducing electron-withdrawing groups (trifluoromethyl, fluorosulfonyl) to adjust electron density distribution. This changes the Lewis basicity and solubility parameters while maintaining anion coordination capability, thereby improving electrochemical stability without sacrificing anion stability.
Solution Approach 2:
The patent creates composite molecular structures combining silazane cores with electron-withdrawing group substituents. This composite approach integrates the high electrochemical stability of silazane frameworks with the tailored solubility and coordination properties of electron-withdrawing groups, achieving simultaneous improvement in anion stability and electrochemical compatibility.
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 silazane-based anion receptors improve ionic conductivity and electrochemical stability, enabling safe operation of lithium batteries and preventing fires due to thermal runaway.
Implementation Method 1
Anion receptors enhance anion stability by Lewis acid-base interactions. Such anion receptors, compounds with electron-poor atoms (N and B), allow electron-rich anions to be coordinated in the surrounding thereof
Implementation Method 2
a solidifying electrolyte that cures at high temperatures to prevent thermal runaway
Data Source
AI summary
The present invention relates to novel anion receptors and electrolytes comprising the same. More particularly, the novel anion receptor comprises a compound comprising a structure which combines silicon and nitrogen atoms, such as a novel silazane, in which an amine group substituted with an electron withdrawing group is introduced into a silicon atom or an electron withdrawing group is introduced into a nitrogen atom; or a mixture of a compound comprising a structure which combines silicon and nitrogen atoms, such as the novel silazane, and a composition selected from a linear hydrocarbon, a cyclic hydrocarbon, a polyalkylene oxide, and a siloxane compound in which the amine group substituted with the electron-withdrawing group is introduced or the electron-withdrawing group is introduced to a nitrogen atom in a ring.