Lithium Transition Metal Oxide Precursors via Dry Impact Milling
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Solution Overview
Problem
Existing methods for producing lithium transition metal oxide particulates, such as LiNMC, face challenges including inhomogeneous element distribution, high production costs, water usage, and environmental impact due to water-based processes, and the need for long sintering times, which affect electrochemical performance and efficiency.
Innovation Solution
A novel method involving dry impact milling of metal oxide precursors to create single-phase rock-salt oxide particulates with controlled grain and particle sizes, followed by heating with lithium compounds to form lithium transition metal oxide particulates with an O3 crystal structure, using solid-state processes to enhance atomic mixing and reduce processing time and costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If co-precipitation method is used to prepare MMH or MMC precursor particulate, then atomic-scale mixing of transition metals is achieved, but production cost increases and large amounts of waste water are produced
Solution Approach 1:
The invention changes the chemical parameters of the precipitation process by controlling pH, temperature, and precipitation rate to achieve atomic-scale mixing while reducing waste water production. The controlled precipitation conditions allow for efficient mixing without requiring excessive water or complex purification steps.
Solution Approach 2:
The invention replaces traditional mechanical grinding and mixing methods with a chemical precipitation process that achieves atomic-scale mixing through controlled chemical reactions. This substitution eliminates the need for extensive mechanical processing and reduces associated costs and waste.
2Manufacturing precision
If long sintering times are used to convert MMH or MMC precursor particulates to single-phase LiNMC, then complete phase transformation is achieved, but lithium loss via evaporation increases and production cost increases
Solution Approach 1:
The invention performs preliminary atomic-scale mixing of transition metals in the MMH or MMC precursor, which prepares the material structure for faster and more efficient sintering. This preliminary arrangement allows complete phase transformation at shorter sintering times, reducing lithium evaporation and energy consumption.
Solution Approach 2:
The invention optimizes sintering parameters including temperature profile, atmosphere control, and time duration to achieve single-phase LiNMC formation more quickly. By carefully controlling these parameters, the process achieves complete transformation while minimizing lithium loss through evaporation.
3Ease of operation
If co-precipitation method is used to produce MMH or MMC precursor particulate with particle size larger than 100 nm, then dust and particle handling problems are reduced, but the number of processing steps increases
Solution Approach 1:
The invention controls the precipitation parameters (pH, temperature, addition rate) to directly produce precursor particulate with optimal particle size greater than 100 nm. This direct control eliminates the need for additional particle size adjustment steps, reducing overall process complexity while maintaining good handling properties.
4Manufacturing precision
If soluble metal salts are used as sources of transition metals in co-precipitation method, then atomic-scale mixing is achieved, but material cost increases compared to insoluble sources
Solution Approach 1:
The invention uses soluble metal salts but optimizes the precipitation conditions to achieve complete and efficient utilization of the metal ions. By controlling pH and precipitation rate, the process achieves atomic-scale mixing while minimizing salt consumption and waste, thereby reducing overall material costs despite using soluble sources.
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 produces high-quality lithium transition metal oxide particulates with improved electrochemical performance, reduced production time, and lower environmental impact, suitable for use in rechargeable lithium batteries.
Implementation Method 1
The rock-salt precursor particulate is heated to react with a lithium compound to thereby form the lithium transition metal oxide
Implementation Method 2
dry impact milling of metal oxide precursors to create single-phase rock-salt oxide particulates with controlled grain and particle sizes, followed by heating with lithium compounds to form lithium transition metal oxide particulates
Data Source
AI summary
Improved methods for preparing lithium transition metal oxide particulate such as lithium nickel metal cobalt oxide (“NMC”) for use in lithium batteries and other applications are disclosed. The lithium transition metal oxide particulate is prepared from appropriate transition metal oxide and Li compound precursors mainly using dry, solid state processes including dry impact milling and heating. Further, novel precursor particulates and novel methods for preparing precursor particles for this and other applications are disclosed.