Low Temperature Lithium Production via Non-Aqueous Electrolysis
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Solution Overview
Problem
Conventional lithium production methods, such as molten-salt electrolysis, are energy-intensive, costly, and result in lithium metal with impurities, requiring high-temperature purification and being unsuitable for battery applications, while low-temperature processes struggle to achieve high purity lithium on an industrial scale.
Innovation Solution
A low-temperature electrolysis method using a non-aqueous electrolyte composition of acetonitrile and cation bis(trihaloalkylsulfonyl)imide or bis(halosulfonyl)amide with a lithium compound like LiOH or Li2CO3, allowing lithium metal to be deposited at the cathode with a purity of over 95 wt.% without the need for subsequent purification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If molten-salt electrolysis is used to produce lithium metal, then lithium metal can be produced, but the process requires high temperatures (above 350°C) and results in lithium with impurities requiring subsequent purification
Solution Approach 1:
The patent changes the fundamental parameters of the electrolysis system by using a non-aqueous electrolyte (acetonitrile-based) instead of conventional molten salts, enabling lithium production at temperatures below 350°C while achieving high purity lithium metal without subsequent purification steps
Solution Approach 2:
The patent introduces a specific intermediary substance (acetonitrile-based non-aqueous electrolyte with cation bis(trihaloalkylsulfonyl)imide) that mediates the electrolysis process, allowing lithium deposition at lower temperatures with high purity by acting as a selective medium that prevents impurity incorporation
2Productivity
If molten-salt electrolysis is used, then lithium metal production is achieved, but energy consumption is high due to high temperature requirements
Solution Approach 1:
The patent fundamentally changes the operating temperature parameter from above 350°C to below 350°C by using a non-aqueous electrolyte system, directly reducing the energy input required for heating and maintaining the electrolysis process while sustaining high productivity
3Manufacturing precision
If conventional electrolysis processes are used, then lithium metal can be produced, but subsequent purification steps are required to achieve greater than 95 wt. % purity
Solution Approach 1:
The non-aqueous electrolyte acts as a selective intermediary medium during electrolysis that prevents impurity incorporation into the lithium metal deposit, achieving greater than 95 wt. % purity directly from the electrolysis process without requiring additional purification equipment or steps
Solution Approach 2:
The patent merges the lithium production and purification functions into a single electrolysis step by using the acetonitrile-based electrolyte system, eliminating the need for separate purification operations and simplifying the overall process
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 method produces lithium metal with high purity suitable for battery applications in a one-pot process at low temperatures, eliminating the need for high-temperature purification and enabling scalable industrial production.
Implementation Method 1
a non-aqueous electrolyte composition of acetonitrile and cation bis(trihaloalkylsulfonyl)imide or bis(halosulfonyl)amide with a lithium compound like LiOH or Li2CO3, allowing lithium metal to be deposited at the cathode
Implementation Method 2
Power is applied to the anode and cathode to form lithium metal on the cathode of the electrolysis cell
Data Source
AI summary
A method and electrolysis cell for producing lithium metal at a low temperature. The method includes combining (i) acetonitrile and (ii) a cation bis(trihaloalkylsulfonyl)imide, cation bis(trihalosulfonyl)imidic acid, a cation bis(trihaloalkylsulfonyl)amide, or cation bis(trihaloalkylsulfonyl)amidic acid in a weight ratio of (i) to (ii) about 100:1 to about 5:1 to provide a non-aqueous electrolyte composition. A lithium compound selected from the group consisting of LiOH, Li2O and Li2CO3 is dissolved in the electrolyte composition to provide a lithium doped electrolyte composition. Power is applied to the electrolyte composition to form lithium metal on a cathode of an electrolysis cell. The lithium metal separated from the cathode has a purity of at least about 95 wt. %.