Spherical Lithium Titanate Anode via Spray Drying
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Solution Overview
Problem
Current methods for preparing lithium titanate (Li4Ti5O12) as an anode active material for lithium ion batteries face challenges such as high costs, impurity issues, and difficulty in achieving a spherical shape, which affects the battery's performance and capacity.
Innovation Solution
A method involving mixing a lithium salt with rutile-phase titania, followed by heat-treatment at 700-900°C, and subsequent atomization to produce spherical primary particles of lithium titanium oxide with a spinel structure, optimized for use as an anode active material in lithium rechargeable batteries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If conventional methods are used to prepare lithium titanate, then the material can be produced, but the particles do not achieve a spherical shape and have irregular morphology
Solution Approach 1:
The invention applies spheroidality by using a spray drying process that transforms irregularly shaped lithium titanate particles into spherical particles. The spray drying technique creates a liquid precursor mixture that is atomized into droplets, which then dry into spherical particles during the drying process, achieving the desired spherical morphology for improved battery performance
Solution Approach 2:
The invention changes physical parameters by controlling the spray drying conditions including temperature, atomization pressure, and drying time. These parameter changes enable the transformation from irregular particles to spherical particles while maintaining the desired size distribution and morphology, resolving the contradiction between achieving spherical shape and manufacturing precision
2Quantity of substance
If lithium metal is used as anode active material, then high capacity is achieved, but dendrite formation causes short circuits and safety issues
Solution Approach 1:
The invention uses lithium titanate particles as a disposable anode material that provides sufficient capacity for battery operation without the safety risks of lithium metal. The spherical lithium titanate particles enable reversible lithium ion insertion and extraction, providing reliable and safe battery operation while maintaining adequate capacity
Solution Approach 2:
The invention introduces lithium titanate as an intermediary material between lithium metal and graphite anodes. This intermediary material provides the capacity benefits of lithium metal while eliminating the dendrite formation problem, acting as a safe intermediate solution that maintains both capacity and reliability
3Quantity of substance
If graphite is used as anode active material, then reasonable capacity is achieved, but the theoretical capacity is limited to about 380 mAh/g
Solution Approach 1:
The invention changes the chemical composition parameter by using lithium titanate (Li4Ti5O12) instead of graphite as the anode material. This parameter change enables the battery to achieve higher theoretical capacity while maintaining structural stability and safety, overcoming the capacity limitation of graphite anodes
4Quantity of substance
If amorphous carbon is used as anode active material, then large capacity is achieved, but high irreversibility occurs during charging and discharging
Solution Approach 1:
The invention changes the material composition from amorphous carbon to crystalline lithium titanate with a spinel structure. This parameter change eliminates the high irreversibility problem of amorphous carbon while maintaining high capacity, as the ordered crystal structure of lithium titanate enables reversible lithium ion insertion and extraction with minimal energy loss
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
This approach enables the production of lithium titanium oxide particles with improved spherical shape, surface area, and tap density, enhancing the battery's charging/discharging efficiency and lifespan while reducing costs and impurity concerns.
Implementation Method 1
performing heat-treatment on the mixture at a temperature of about 700 to about 900° C.
Implementation Method 2
atomizing a resultant on which the heat-treatment is performed to prepare a spherical primary particle
Data Source
AI summary
A spherical primary particle of a lithium titanium oxide of which average diameter is in the range of about 1 to about 20 μm, a method of preparing the spherical primary particle of the lithium titanium oxide, and a lithium rechargeable battery including the spherical primary particle of the lithium titanium oxide.