Battery Cell Material Preparation via Mist Drying and Continuous Reaction
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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 with desired crystal structures and morphologies, reducing manufacturing time and energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
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 manufacturing time and energy consumption are excessively high
Solution Approach 1:
The patent changes the physical state parameter of the precursor material from solid to liquid, and changes the heating method from external furnace heating to internal microwave heating. This transforms the graphitization process from a slow solid-state pyrolysis requiring 3000°C for extended periods into a faster liquid-phase microwave heating process, significantly reducing manufacturing time while maintaining crystal structure quality
Solution Approach 2:
The patent replaces the mechanical grinding process with a chemical dissolution and reprecipitation approach. Instead of mechanically grinding solid precursors to achieve uniform particle size and mixing, the process dissolves precursors in liquid ammonia and allows controlled precipitation, eliminating the need for extensive mechanical processing while achieving superior uniformity
2Productivity
If conventional solid-state processes are used for cathode active materials, then the materials are produced, but the particle uniformity and quality consistency are poor
Solution Approach 1:
The patent changes the processing state from solid to liquid, enabling molecular-level mixing and uniform distribution of precursor materials. The liquid ammonia medium allows for homogeneous dissolution and controlled precipitation, producing particles with consistent size and composition that cannot be achieved through conventional solid-state mixing and processing methods
Solution Approach 2:
The patent introduces liquid ammonia as an intermediary medium that facilitates uniform mixing and controlled precipitation of precursor materials. The ammonia acts as a solvent and structure-directing agent, enabling the formation of uniform particles with desired crystal structures, replacing the need for complex mechanical mixing and processing steps
3Manufacturing precision
If conventional manufacturing methods are used, then materials are produced, but the manufacturing cost is considerably higher
Solution Approach 1:
The patent replaces external furnace heating with internal microwave heating. The microwave energy is absorbed directly by the liquid precursor mixture, heating it rapidly and uniformly from within. This eliminates the need for energy-intensive external furnaces operating at extreme temperatures for extended periods, dramatically reducing energy consumption while maintaining or improving material quality
Solution Approach 2:
The patent utilizes phase transitions of liquid ammonia (evaporation and condensation) as a heat transfer mechanism. The rapid evaporation during microwave heating and subsequent condensation provides efficient thermal processing without requiring sustained extreme temperatures, reducing overall energy input while achieving the desired crystalline products
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, consistent active battery materials with improved energy density and cycle life, while reducing production time, labor, and costs compared to conventional methods.
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, and 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.