Jet Mill Precursor Mixing for Lithium Phosphate Batteries
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Solution Overview
Problem
Existing methods for producing electrode active materials for lithium batteries often result in materials that lack one or more essential characteristics such as high free energy of reaction, lithium intercalation capacity, lattice structure maintenance, rapid lithium diffusion, electrical conductivity, and economic production, due to suboptimal synthesis methods and material properties.
Innovation Solution
A method involving the production of a mixture of lithium hydrogen phosphate and a metal hydroxide, followed by grinding in a jet mill to achieve a finely ground, homogeneous precursor, which is then reacted with additional components to form an electrode active material with improved processability, cost-effectiveness, and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional solid state reaction methods are used to synthesize electrode active materials, then the synthesis process is simple, but the resulting materials lack essential characteristics such as high free energy of reaction, lithium intercalation capacity, rapid lithium diffusion, and electrical conductivity
Solution Approach 1:
The patent applies preliminary action by pre-grinding the lithium hydrogen phosphate and metal hydroxide precursors in a jet mill to achieve intimate mixing and reduced particle size before the actual reaction. This preliminary size reduction and mixing step ensures that when the materials are subsequently reacted, they achieve complete reaction with optimal performance characteristics including high free energy of reaction, lithium intercalation capacity, and electrical conductivity.
Solution Approach 2:
The patent changes the particle size parameter by grinding the precursor mixture in a jet mill to achieve a fine, homogeneous particle size distribution. This parameter change from coarse to fine particles increases the surface area for reaction, improves mixing homogeneity, and enables the resulting material to achieve essential performance characteristics such as rapid lithium diffusion and electrical conductivity that are not attainable with conventional particle sizes.
2Ease of operation
If larger particle sizes are used in the precursor mixture, then the handling and processing is easier, but the reaction completeness and homogeneity of the final product deteriorates
Solution Approach 1:
The patent changes the particle size parameter by grinding the precursor mixture in a jet mill to achieve a fine, homogeneous particle size distribution. This parameter change from coarse to fine particles increases the surface area for reaction, improves mixing homogeneity, and enables the resulting material to achieve essential performance characteristics such as rapid lithium diffusion and electrical conductivity that are not attainable with conventional particle sizes.
3Device complexity
If conventional grinding methods are used, then the equipment is simpler, but the particle size reduction and homogeneity achievement is insufficient
Solution Approach 1:
The patent replaces conventional mechanical grinding methods with a jet mill that uses fluid dynamics (gas or liquid jet) to achieve particle size reduction and mixing. This substitution of the mechanical grinding system with a fluid-based jet mill system achieves superior particle size reduction and homogeneity while maintaining reasonable equipment complexity.
Solution Approach 2:
The patent employs pneumatic principles by using a jet mill that utilizes high-velocity gas or liquid jets to fracture and mix the precursor particles. The pneumatic force from the jet stream achieves efficient particle size reduction and homogeneous mixing of the lithium hydrogen phosphate and metal hydroxide, producing the fine particle size and homogeneity required for optimal electrode material performance.
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 efficient and complete reaction of materials, leading to improved processability, reduced costs, and enhanced performance of the electrode active materials, addressing the limitations of existing synthesis techniques.
Implementation Method 1
grinding in a jet mill to achieve a finely ground, homogeneous precursor
Data Source
AI summary
Methods for producing an electrode active material precursor, comprising;a) producing a mixture comprising particles of lithium hydrogen phosphate, having a first average particle size, and a metal hydroxide, having a second average particle size; andb) grinding said mixture in a jet mill for a period of time suitable to produce a generally homogeneous mixture of particles having a third average size smaller than said first average size. The precursor may be used as a starting material for making electrode active materials for use in a battery, comprising lithium, a transition metal, and phosphate or a similar anion.