Battery Cell Material Preparation via Continuous Mist Drying
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Solution Overview
Problem
Conventional manufacturing processes for lithium ion battery cathode active materials are costly, time-consuming, and result in inconsistent quality due to challenges in producing uniform particles with desired crystal structures, sizes, and morphologies, leading to low energy density and cycle life.
Innovation Solution
A method and system involving a mist generator, drying chamber, and reactor to form a gas-solid mixture from precursor compounds, which are then reacted and separated to produce high-quality, uniform solid particles suitable for battery electrodes, reducing processing time and energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional solid-state processes (grinding and pyrolysis at extreme high temperature) are used to prepare graphite materials, then the crystal structure is formed, but the processing time and energy consumption are extremely high
Solution Approach 1:
The patent changes the processing parameters from extreme high temperature (3000°C) to moderate temperature (400-1000°C) by using a gas-phase reaction process instead of solid-state pyrolysis, achieving crystal structure formation with significantly reduced energy consumption
Solution Approach 2:
The patent replaces the mechanical grinding and solid-state pyrolysis process with a chemical vapor deposition process where gaseous precursors react to form solid crystalline particles directly, eliminating the need for extreme mechanical and thermal processing
2Quantity of substance
If conventional manufacturing processes are used for cathode active materials, then the materials can be produced, but the quality consistency is poor due to difficulty in producing uniform particles with desired crystal structures, sizes, and morphologies
Solution Approach 1:
The patent produces particles individually through gas-phase nucleation and growth, where each particle forms independently from vapor precursors, ensuring uniform size and morphology without the aggregation problems of conventional methods
Solution Approach 2:
The patent controls particle characteristics by adjusting gas flow rates, temperature gradients, and precursor concentrations during the vapor-phase reaction, enabling precise control over crystal structure, size, and morphology for consistent quality
3Quantity of substance
If conventional manufacturing processes are used for lithium battery materials, then the materials can be produced, but the manufacturing cost is considerably higher than other types of secondary batteries
Solution Approach 1:
The patent employs a continuous gas-phase reaction process where precursors are continuously fed, reacted, and collected, eliminating the batch processing steps and extensive drying/calcination operations of conventional methods, thereby reducing manufacturing time and cost
Solution Approach 2:
The patent extracts and eliminates the expensive and time-consuming high-temperature pyrolysis and extended drying steps from the conventional process by directly forming crystalline particles through controlled gas-phase reaction at moderate temperatures
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 high-quality, uniform active materials with improved energy density and cycle life, reducing manufacturing costs and time while enhancing the consistency of battery cell performance.
Implementation Method 1
drying the mist of the liquid mixture for a first residence time inside the drying chamber, and forming a first gas-solid mixture inside the drying chamber from the heated first gas and the mist
Implementation Method 2
reacting the second gas-solid mixture inside the reactor for a second residence time, oxidizing the second gas-solid mixture into an oxidized reaction product
Data Source
AI summary
A continuous process for producing a material of a battery cell using a system having a mist generator, a drying chamber, one or more gas-solid separators and a reactor is provided. A mist generated from a liquid mixture of two or more metal precursor compounds in desired ratio is dried inside the drying chamber. Heated air or gas is served as the gas source for forming various gas-solid mixtures and as the energy source for reactions inside the drying chamber and the reactor. One or more gas-solid separators are used in the system to separate gas-solid mixtures from the drying chamber into solid particles mixed with the metal precursor compounds and continuously deliver the solid particles into the reactor for further reaction to obtain final solid material particles with desired crystal structure, particle size, and morphology.