Lithium Oxide Powder Production via Dual-Stage Salt Heating
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Solution Overview
Problem
Existing methods for producing lithium oxide powders often require harsh conditions, multiple steps, and result in impurities such as lithium hydroxide and other lithium compounds, making them economically and purity-wise inefficient.
Innovation Solution
A process involving heating a mixture of two lithium salts at specific temperatures to form lithium oxide powders, with the option of adding a non-reactive additive to prevent agglomeration and enhance purity, and subsequent conversion of lithium salt to lithium oxide to achieve high purity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional methods are used to produce lithium oxide, then lithium oxide can be produced, but the process requires harsh conditions and multiple steps resulting in impurities
Solution Approach 1:
The process divides the production into two distinct stages: (1) heating a mixture of two lithium salts to form lithium oxide powder containing lithium salt, and (2) converting the lithium salt to lithium oxide through heating. This segmentation allows each stage to be optimized independently, achieving high purity without requiring complex multi-step conventional methods
Solution Approach 2:
The invention employs specific temperature parameters: heating the lithium salt mixture to a temperature below the melting point of the lower-melting salt, then subsequently heating the resulting powder to a temperature 25-200°C above the melting point of the lithium salt. These controlled parameter changes enable high purity production under milder overall conditions
2Manufacturing precision
If lithium oxide is produced with minimal lithium salt content, then purity is improved, but the product becomes sensitive to ambient air
Solution Approach 1:
A non-reactive additive is introduced as an intermediary substance during the first heating stage. This additive facilitates the formation of lithium oxide while remaining inert, and its presence during processing helps maintain product stability against ambient air exposure without interfering with the chemical conversion
3Ease of manufacture
If the process uses milder conditions, then economic feasibility improves, but production efficiency may be reduced
Solution Approach 1:
The process maintains continuous heating through both stages without interruption or significant cooling periods. The second heating stage begins immediately after the first, ensuring continuous conversion of lithium salt to lithium oxide. This continuity maximizes production efficiency while operating under milder overall conditions compared to conventional methods
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 process produces high purity lithium oxide powders with minimal lithium salt content, which are not ambient air stable, and does so under milder conditions, improving economic feasibility and product quality.
Implementation Method 1
heating a mixture of two lithium salts at one or more temperatures ranging from about 50 degrees Celsius below the eutectic point of the mixture of two different lithium salts to a temperature below the melting point of the lithium salt having a lower melting point, to form a powder comprising lithium oxide and a lithium salt
Implementation Method 2
During the process, at least a portion of gaseous byproducts produced by the process is removed
Implementation Method 3
heating the powder comprising lithium oxide and a lithium salt at one or more temperatures in the range of about 25 degrees Celsius below the melting point of the lithium salt to a temperature about 200 degrees Celsius above the melting point of the lithium salt
Data Source
AI summary
This invention provides processes for preparing lithium oxide powders from combinations of lithium salts.