Polyanionic Carbene Electrolytes for Magnesium Battery Stability

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

The development of practical high-capacity magnesium batteries is hindered by the lack of suitable electrolytes that are resistant to decomposition at the preferred voltage windows, which is essential for improving energy storage capacity and sustainability in portable devices and electric vehicles.

Innovation Solution

The fusion of carbenes with carborane anions to selectively produce stable lithium and magnesium adducts of dianionic normal C-2 and abnormal C-5 imidazolylidene constitutional isomers, as well as trianionic C-2/C-5 deprotonated species, using a novel condensation reaction between unusual anionic carboranyl amines and ketone or aldehyde derivatives, allowing for the formation of polyanionic carbenes with unique chemical behavior.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional electrolytes are used in magnesium batteries, then the battery can operate, but the electrolytes decompose at the preferred voltage windows (1-5 V vs Mg0/+2)

Engineering Contradiction:

Improveelectrolyte stabilityVSAvoidenergy storage capacity

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent changes the chemical parameters of the electrolyte by introducing polyanionic carbenes with carba-closo-dodecaborate groups. These modified electrolytes have altered electrochemical stability windows that accommodate the 1-5 V operating range of magnesium batteries without decomposition, thereby enabling high energy storage capacity while maintaining reliability.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs composite molecular structures combining polyanionic carbene frameworks with carba-closo-dodecaborate anions. This composite material approach creates electrolytes with enhanced stability properties that resist decomposition at high voltages, solving both the reliability and energy storage capacity requirements simultaneously.

Inventive Principle:

Principle #40Composite materials

2Quantity of substance

If lithium ion technology is used, then portable devices and electric vehicles can achieve current storage capacity, but cost and sustainability are limited

Engineering Contradiction:

Improveenergy storage capacityVSAvoidcost and sustainability

Core Design Contradiction:

Quantity of substanceVSEase of manufacture

Solution Approach 1:

The patent replaces expensive lithium-based systems with magnesium-based systems using polyanionic carbene electrolytes. Magnesium is more abundant and less costly than lithium, and the novel electrolyte formulation enables practical magnesium battery operation, achieving comparable energy storage capacity at lower cost and with improved sustainability.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

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 enables the creation of new opportunities for catalysis and energy storage by providing stable polyanionic carbenes that can function as effective electrolytes for magnesium batteries, enhancing their energy storage capacity and sustainability.

Implementation Method 1

The carborane anion 4 delocalizes its charge throughout the 12 cage atoms, rendering the cluster and its derivatives very weakly coordinating.

Methodology Applied

Scientific EffectCharge delocalization:

Implementation Method 2

using a novel condensation reaction between unusual anionic carboranyl amines and ketone or aldehyde derivatives, allowing for the formation of polyanionic carbenes with unique chemical behavior.

Methodology Applied

Scientific EffectCondensation reaction:

Data Source

PatentUS9994595B2Catalyst and battery components derived from condensation reactions with carba-closo-dodecaborate amines

Publication Date: 2018.06.12 RGT UNIV OF CALIFORNIA

AI summary

Described herein is the fusion of two families of unique carbon-containing molecules that readily disregard the tendency of carbon to form four chemical bonds, namely N-heterocyclic carbenes (NHCs) and carborane anions. Deprotonation of an anionic imidazolium salt with lithium diisopropylamide at room temperature leads to a mixture of lithium complexes of C-2 and C-5 dianionic NHC constitutional isomers as well as a trianionic (C-2, C-5) adduct. Judicious choice of the base and reaction conditions allows for the selective formation of all three stable polyanionic carbenes. In solution, the so-called abnormal C-5 NHC lithium complex slowly isomerizes to the normal C-2 NHC, and the process can be proton catalyzed by the addition of the anionic imidazolium salt. These results indicate that the combination of two unusual forms of carbon atoms can lead to unexpected chemical behavior, and that this strategy paves the way for the development of a broad new generation of NHC ligands for catalysis.