Low Temperature Lithium Production via Organic Electrolyte
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Solution Overview
Problem
Conventional lithium production methods, such as molten-salt electrolysis, require high temperatures and result in lithium metal with impurities, making it unsuitable for battery applications and necessitating a subsequent purification step, 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 produced with a purity of greater than 95 wt.% without the need for additional purification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If molten-salt electrolysis is used to produce lithium metal, then lithium production is achieved, but the temperature must be maintained above 352°C and the lithium metal contains impurities such as sodium
Solution Approach 1:
The invention changes the temperature parameter from high temperature (above 352°C) to low temperature (below 180°C) by using a different electrolyte system. Specifically, it uses an organic electrolyte containing acetonitrile and lithium perchlorate instead of molten salt, enabling lithium deposition at lower temperatures while achieving high purity (greater than 95 wt.%) without sodium impurities
Solution Approach 2:
The invention introduces an intermediary substance (organic electrolyte composed of acetonitrile and lithium perchlorate) that mediates the electrolysis process. This intermediary enables lithium ion transport and deposition at low temperatures, replacing the traditional molten salt medium that requires high temperatures and produces impure lithium
2Productivity
If molten-salt electrolysis is used to produce lithium metal, then lithium production is achieved, but subsequent purification steps are required to remove impurities
Solution Approach 1:
The invention merges the electrolysis process with purification by designing an electrolyte system that inherently produces high-purity lithium metal. The organic electrolyte (acetonitrile with lithium perchlorate) enables selective lithium deposition without co-deposition of sodium or other impurities, combining production and purification into a single step, thereby simplifying the overall process and improving productivity
3Quantity of substance
If molten-salt electrolysis is used to produce lithium metal, then lithium production is achieved, but high energy consumption and environmental impact result
Solution Approach 1:
The invention changes the operating temperature parameter from high (above 352°C) to low (below 180°C), which directly reduces energy consumption for heating and maintaining the electrolysis process. The organic electrolyte system requires significantly less thermal energy compared to molten salt, enabling lithium production with lower energy input while maintaining practical production rates
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 enables the production of high-purity lithium metal at temperatures below the melting point of lithium, suitable for battery applications, in a one-pot process without subsequent high-temperature purification, facilitating industrial-scale production with reduced energy consumption and environmental impact.
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
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. %.