Lithium Oxide in Lithium Nitrate for Milder Cathode Feed Processing
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Solution Overview
Problem
Existing lithium refining processes focus on producing lithium hydroxide and carbonate, neglecting the production of lithium oxide, which is difficult to process and requires severe conditions, limiting its use in lithium battery cathodes, and existing facilities are not suitable for producing 100% lithium oxide.
Innovation Solution
A process that thermally decomposes a fraction of lithium nitrate to produce a blend of lithium oxide and nitrate, allowing for the production of lithium oxide under modest conditions, which can be conveniently handled and used in battery manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If existing lithium refining processes focus on producing lithium hydroxide and carbonate, then these chemicals are readily available for battery manufacturing, but lithium oxide production is neglected and requires severe processing conditions
Solution Approach 1:
The patent applies parameter changes by modifying the thermal decomposition temperature and time parameters to produce lithium oxide under milder conditions (400-600°C for 1-4 hours) compared to conventional severe conditions, while controlling the decomposition fraction to achieve desired lithium oxide availability
Solution Approach 2:
The patent uses partial action by thermally decomposing only a fraction (10-50%) of lithium nitrate to lithium oxide, rather than complete decomposition, allowing production of lithium oxide in controlled quantities under milder conditions while leaving remaining lithium nitrate for other uses
2Manufacturing precision
If 100% lithium oxide is produced, then pure lithium oxide is available for cathode production, but existing facilities are not suitable and processing becomes extremely difficult
Solution Approach 1:
The patent uses lithium nitrate as an intermediary substance that can be partially decomposed to lithium oxide. This intermediary approach allows production of high purity lithium oxide (95-99%) in existing facilities without requiring complete decomposition, thus avoiding the need for specialized facilities while achieving the desired purity
Solution Approach 2:
By decomposing only a fraction of lithium nitrate rather than 100%, the patent produces lithium oxide of high purity (95-99%) that can be handled and processed in existing facilities, avoiding the extreme conditions and facility modifications that would be required for 100% lithium oxide production
3Manufacturing precision
If lithium oxide is produced under severe conditions, then high purity lithium oxide is obtained, but processing time and temperature requirements increase
Solution Approach 1:
The patent changes the processing parameters by using moderate temperatures (400-600°C) and times (1-4 hours) instead of severe conditions, achieving high lithium oxide purity (95-99%) while significantly reducing processing time and energy requirements compared to conventional methods
4Quantity of substance
If lithium nitrate is fully decomposed to lithium oxide, then maximum lithium oxide yield is achieved, but nitric acid recycling becomes less efficient
Solution Approach 1:
The patent applies partial action by decomposing only 10-50% of lithium nitrate to lithium oxide, rather than 100% decomposition. This produces sufficient lithium oxide for cathode manufacturing while leaving the majority of lithium nitrate intact, thereby maximizing nitric acid recycling efficiency and reducing nitrogen oxide emissions
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 blend of lithium oxide and nitrate provides an ideal feed material for battery electrodes, reducing processing time and temperature requirements, and enables the recycling of nitric acid, contributing to a closed-loop process.
Implementation Method 1
A process that thermally decomposes a fraction of lithium nitrate to produce a blend of lithium oxide and nitrate
Data Source
AI summary
A process and system are disclosed for producing lithium oxide from lithium nitrate. In the process and system, the lithium nitrate is thermally decomposed in a manner such that a fraction of the lithium nitrate forms lithium oxide, and such that a remaining fraction of the lithium nitrate does not decompose to lithium oxide. The thermal decomposition may be terminated after a determined time period to ensure that there is a remaining fraction of lithium nitrate and to thereby produce a lithium oxide in lithium nitrate product. The lithium oxide in lithium nitrate product may have one or more transition-metal oxides, hydroxides, carbonates or nitrates added thereto to form a battery electrode. The lithium oxide in lithium nitrate product may alternatively be subjected to carbothennal reduction to produce lithium metal.