Transition Metal Hydroxide Preparation with Segmented Mechanical Energy
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Solution Overview
Problem
Existing lithium ion batteries have limitations in energy density, particularly in terms of volumetric energy density, and face challenges in processing cathode materials with high specific capacity and suitable morphology for maximum energy density.
Innovation Solution
A process involving the preparation of transition metal hydroxides with controlled morphology and surface properties by combining transition metal salts with alkali metal hydroxides in a stirred vessel, with continuous mechanical power input in a separate compartment, to produce particulate materials suitable for lithium ion battery electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If large amounts of mechanical energy are introduced into large volumes of solutions or suspensions, then the morphology and surface properties of transition metal hydroxides are improved, but the apparatus complexity increases
Solution Approach 1:
The patent divides the stirred vessel into multiple compartments, with at least one compartment dedicated to introducing mechanical energy through a homogenizer or wet grinder. This segmentation allows concentrated mechanical energy input in a specific zone rather than attempting to distribute it uniformly throughout the entire large volume, thereby achieving improved morphology and surface properties without requiring the entire apparatus to be overly complex.
2Quantity of substance
If transition metal hydroxides with high specific capacity are used to increase energy density, then the energy density of batteries is improved, but the processability and morphology control become more difficult
Solution Approach 1:
The patent systematically varies multiple process parameters including mechanical energy input (50-10000 W/l), pH (9-14), temperature (20-100°C), and residence time (0.1-600 seconds) to optimize both the morphology and surface properties of transition metal hydroxides. By controlling these parameters, the patent achieves particles with D50 between 6-12 μm and specific surface areas of 0.5-5.0 m²/g, which provide both high energy density and good processability for battery electrode manufacturing.
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 results in transition metal hydroxides with optimal particle size and density, enhancing the energy density and processability of cathode materials for lithium ion batteries, leading to improved battery performance.
Implementation Method 1
introducing a mechanical power in the range from 50 to 10 000 W/l in a proportion of the suspension in each case, based on the proportion of the suspension
Implementation Method 2
combining, in a stirred vessel, at least one solution of at least one transition metal salt with at least one solution of at least one alkali metal hydroxide to prepare an aqueous suspension of transition metal hydroxide
Data Source
AI summary
The present invention relates to a process for preparing transition metal hydroxides with a mean particle diameter in the range from 6 to 12 μm (D50), which comprises combining, in a stirred vessel, at least one solution of at least one transition metal salt with at least one solution of at least one alkali metal hydroxide to prepare an aqueous suspension of transition metal hydroxide, and, in at least one further compartment, continuously introducing a mechanical power in the range from 50 to 10 000 W/l in a proportion of the suspension in each case, based on the proportion of the suspension, and then recycling the proportion into the stirred vessel.