On-site spray synthesis for lithium-ion solid battery manufacturing
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Solution Overview
Problem
Current lithium-ion solid battery manufacturing processes are complex, costly, and inefficient, particularly due to the need for high-temperature treatments and the use of organic solvents, which limits the production of high-voltage batteries with long cycle life and high energy density.
Innovation Solution
A synthesis method for lithium-ion solid batteries involving on-site spray synthesis using molten lithium metal to produce current collectors, cathodes, diaphragms, and anodes, simplifying the manufacturing process and enabling the production of high-voltage batteries through simultaneous spraying of metal compounds and lithium metal on a substrate, reducing the need for high-temperature treatments and organic solvents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional high-temperature treatment and ball milling processes are used to prepare solid electrolytes, then lithium-ion conduction capability is achieved, but manufacturing complexity and cost increase significantly
Solution Approach 1:
The invention changes the temperature parameter from conventional high-temperature (750°C) treatment to low-temperature (below 100°C) processing. The spray drying process enables solid electrolyte formation at temperatures below 100°C, dramatically reducing the thermal energy input and simplifying the manufacturing process while maintaining lithium-ion conduction capability
Solution Approach 2:
The invention replaces the mechanical ball milling process with a spray drying process. Instead of mechanically grinding and mixing powders at high temperatures, the method uses aerosolization and rapid evaporation to form solid electrolyte films, eliminating the need for complex mechanical processing equipment and high-temperature furnaces
2Ease of manufacture
If organic solvents and diaphragms are used in lithium-ion batteries, then battery assembly is simplified, but cycle life decreases and safety hazards increase
Solution Approach 1:
The invention changes the physical state of the electrolyte from liquid (organic solvent-based) to solid. The spray drying process produces a solid electrolyte film that eliminates the need for separate liquid electrolyte filling and diaphragm installation steps, while the solid state inherently prevents the chemical reactions that cause degradation and safety issues
Solution Approach 2:
The invention creates a composite solid electrolyte system by spray-drying metal salts (such as lithium trifluoromethanesulfonate) that form a solid film containing both ionic conductivity pathways and structural integrity. This composite approach eliminates organic solvents while maintaining the necessary ion transport function
3Use of energy by moving object
If battery voltage is increased to improve energy density, then volumetric energy density increases, but cathode material oxidizes the electrolyte solution
Solution Approach 1:
The invention changes the chemical composition and physical state of the electrolyte from liquid organic solvent to solid inorganic salt-based material. This fundamental parameter change allows the battery to operate at higher voltages because the solid electrolyte is not susceptible to oxidation by the cathode material, enabling volumetric energy density improvement without compromising electrolyte stability
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 method significantly simplifies the manufacturing process, reduces costs, and enables the production of high-voltage lithium-ion solid batteries with enhanced cycle life and energy density, making them more suitable for electric vehicle applications.
Implementation Method 1
spraying a spraying jet of the current-collector mixture and a spraying jet of the molten lithium metal onto a substrate simultaneously in a heating state to reduce metal ions in the metal compound into a metallic current collector and to oxidize the lithium metal into a solid electrolyte
Implementation Method 2
spraying a spraying jet of the current-collector mixture and a spraying jet of the molten lithium metal onto a substrate simultaneously in a heating state
Data Source
AI summary
The present disclosure relates to a lithium-ion solid battery, and a synthesis method and a synthesis device thereof. The synthesis method comprises a synthesis step for a current collector, a synthesis step for a cathode, a synthesis step for a diaphragm and a synthesis step for an anodee, wherein at least one of the steps is accomplished through on-site spray synthesis, and the on-site spray synthesis comprises a process of spraying a molten lithium metal. In the aforesaid way, the manufacturing process flow of the lithium-ion solid battery can be simplified.