Powdered Lithium Oxide Preparation for Fast Overlithiated Oxide Conversion
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Solution Overview
Problem
Existing methods for producing lithium oxide from lithium peroxide are uneconomical, require high temperatures, result in granular products with low surface area, and introduce impurities due to corrosion and long reaction times, which are detrimental for the production of overlithiated metal oxides.
Innovation Solution
A process involving calcination of lithium peroxide at mild temperatures (280-370°C) under inert conditions to produce a powdered lithium oxide with high specific surface area and low bulk density, which can be easily converted into overlithiated metal oxides with reduced energy input.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If lithium carbonate is thermally decomposed at high temperatures (900-1000°C), then lithium oxide can be produced, but the process requires very high energy input and produces lumpy oxide that must be ground
Solution Approach 1:
The patent changes the temperature parameter from conventional high temperatures (900-1000°C) to a lower range (400-600°C), which fundamentally alters the decomposition behavior of lithium peroxide to produce fine powder directly without requiring subsequent grinding operations
Solution Approach 2:
The patent uses lithium peroxide as a preliminary intermediate substance before final lithium oxide production. This preliminary substance decomposes at lower temperatures to directly yield fine powder, avoiding the energy-intensive high-temperature processing and grinding steps required when starting from lithium carbonate
2Quantity of substance
If lithium carbonate is decomposed at high temperatures, then lithium oxide is produced, but strong corrosive effects cause impurities and crucible destruction
Solution Approach 1:
By changing the temperature parameter to a lower range (400-600°C), the patent avoids the melting and sintering phases that cause corrosive effects, thereby eliminating impurity formation and crucible material destruction while still achieving complete decomposition of lithium peroxide to lithium oxide
3Manufacturing precision
If lithium peroxide is decomposed at low temperature (300°C), then powder form is obtained, but very long reaction times (at least 20 hours) are required
Solution Approach 1:
The patent optimizes the temperature parameter to a specific range (400-600°C) that balances reaction kinetics and product morphology. This temperature range provides sufficient thermal energy to accelerate decomposition (reducing time from 20+ hours to 2-10 hours) while maintaining the fine powder morphology that results from avoiding melting and sintering phases
4Ease of manufacture
If conventional methods are used to produce lithium oxide, then production can proceed, but the processes are uneconomical and require high energy costs
Solution Approach 1:
The patent employs lithium peroxide as a preliminary intermediate that can be produced economically and stored. This preliminary substance serves as a more efficient starting material than metallic lithium or lithium carbonate, enabling decomposition at lower temperatures (400-600°C vs. 900-1000°C) and thereby significantly reducing energy costs while maintaining production feasibility
Solution Approach 2:
By changing the temperature parameter from conventional high temperatures to the optimized range of 400-600°C, the patent reduces energy consumption for heating while maintaining complete conversion efficiency, thereby improving the economic viability of lithium oxide production
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 yields a powdered lithium oxide with a specific surface area of at least 5 m²/g, facilitating quick and energy-efficient conversion into overlithiated metal oxides, reducing impurities and energy costs.
Implementation Method 1
calcination of lithium peroxide at mild temperatures (280-370°C) under inert conditions to produce a powdered lithium oxide
Data Source
AI summary
The invention relates to powdered lithium oxide Li2O, which has a specific surface area according to BET of at least 5 m2/g and a bulk density of at most 0.3 g/ml, a process for its preparation and its use in the preparation of overlithiated metal oxides.