Thin Film Lithium Battery Cathode Manufacturing via Slurry Casting
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Solution Overview
Problem
Current battery technologies face challenges in achieving high power density, long cycle life, wide operating temperature range, rapid recharge capability, and cost-effective large-scale production for electronic devices, as they require advancements in battery performance and manufacturing methods.
Innovation Solution
A hybrid approach for manufacturing thin film lithium batteries involves casting LiCoO2 powder on a metal substrate using a wet slurry method, followed by deposition of a LiPON electrolyte and lithium anode, with specific particle size reduction and annealing techniques to achieve smooth, thin cathode films and improved inter-particle adhesion, reducing production costs and enhancing performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional battery manufacturing methods are used, then production cost is reduced, but power density and performance are insufficient
Solution Approach 1:
The patent changes the manufacturing parameters by using a hybrid approach that combines wet slurry casting with vacuum deposition techniques. This allows for precise control of film thickness and composition, achieving high power density while maintaining cost-effectiveness through optimized processing parameters rather than expensive materials alone
Solution Approach 2:
The patent employs composite material structures by combining LiCoO2 cathode material with LiPON electrolyte and lithium anode in a thin-film configuration. This composite approach enables high power density by integrating materials with complementary properties, achieving superior performance that neither material could provide alone
2Power
If battery thickness is reduced to increase power density, then power density improves, but manufacturing precision requirements increase
Solution Approach 1:
The patent replaces conventional mechanical battery construction with a thin-film deposition process. By using vacuum-based physical vapor deposition and chemical vapor deposition techniques, the manufacturing process achieves atomic-level precision in film thickness control, eliminating the need for mechanical assembly and significantly improving thickness uniformity
Solution Approach 2:
The patent utilizes thin-film technology to create batteries with thicknesses in the micrometer range. The flexible thin-film structure allows for high power density while the vacuum deposition processes ensure precise thickness control, with each layer deposited to within nanometer tolerances
3Speed
If rapid recharge capability is improved, then recharge speed increases, but cycle life and stability deteriorate
Solution Approach 1:
The patent employs porous LiCoO2 cathode material with optimized surface area and pore structure. This porous structure facilitates rapid lithium ion diffusion during charging, enabling fast recharge capability while the controlled porosity maintains structural integrity over many charge-discharge cycles, preserving cycle life
Solution Approach 2:
The patent optimizes the LiPON electrolyte composition and thickness parameters to enable rapid ion transport. By carefully controlling the electrolyte's ionic conductivity and film thickness, the system achieves fast recharge rates while maintaining electrochemical stability and extending cycle life through balanced parameter optimization
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 results in batteries with improved power density, cycle stability, and reduced impedance, achieving capacity retention and efficient energy storage with minimal capacity fade, while being cost-effective for large-scale production.
Implementation Method 1
casting LiCoO2 powder on a metal substrate using a wet slurry method
Implementation Method 2
specific particle size reduction and annealing techniques to achieve smooth, thin cathode films and improved inter-particle adhesion
Data Source
AI summary
A thin-film battery (10) is disclosed which includes a cathode current collector (11), a cathode (12), an electrolyte (13), an anode (14), and an anode current collector (15). The cathode is produced by grinding lithium cobalt oxide or other suitable cathode material to a powder having a mean particle size of between 5 and 12 microns, forming a liquid slurry with the cathode material, casting the liquid slurry upon a substrate, drying the liquid slurry to form a layer of cathode material, and compressing the cathode layer to a generally uniform and smooth thickness of between 5 and 12 microns. The compressed layer is then heated to a temperature which sinters or melts the peripheral edges of the cathode particles together.