Thin-Film Lithiated Cathode Layers for Conformal 3D Battery Deposition
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Solution Overview
Problem
Existing methods fail to produce thin layers of electrochemically active lithiated materials that are homogeneous and conform to complex, three-dimensional patterns, particularly suitable for batteries, and especially for three-dimensional batteries, which require precise deposition on substrates with microstructures.
Innovation Solution
A method involving atomic layer deposition (ALD) of metal precursors, followed by oxidation and crystallization annealing, to form thin layers of lithiated materials on substrates with microstructures, ensuring adherence and homogeneity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional deposition methods are used, then lithiated materials can be deposited on substrates, but the materials cannot achieve homogeneous thin layers with high electrochemical activity suitable for complex three-dimensional patterns
Solution Approach 1:
The deposition process is divided into multiple sequential atomic layer deposition (ALD) cycles, where each cycle deposits a monolayer of material. This segmentation enables precise control over layer thickness and composition, achieving homogeneous thin layers that conform to complex three-dimensional substrate patterns while maintaining high electrochemical activity
Solution Approach 2:
The patent transitions from conventional two-dimensional planar deposition to three-dimensional conformal deposition on microstructured substrates with high surface-to-volume ratios. The ALD technique enables uniform coating on vertical walls, pillars, and cavities, achieving consistent thin layer formation across complex geometries that were previously inaccessible
2Reliability
If thin layers are deposited to achieve high surface-to-volume ratio conformance, then electrochemical performance improves, but manufacturing complexity increases
Solution Approach 1:
The atomic layer deposition process is self-limiting, where each deposition cycle automatically terminates when the surface is fully covered by a monolayer. This self-service mechanism eliminates the need for complex real-time monitoring and control systems, enabling precise thin layer formation on complex geometries through a inherently controllable process
Solution Approach 2:
The patent optimizes deposition parameters including temperature (600-800°C), precursor flow rates, and purge times to achieve complete crystallization and high electrochemical activity. By carefully controlling these parameters, the process achieves superior electrochemical performance while maintaining manufacturing feasibility through well-established ALD equipment
3Reliability
If high temperature annealing is applied to achieve crystallization, then electrochemical activity increases, but substrate material selection is constrained
Solution Approach 1:
An amorphous lithiated metal oxide layer is deposited first via ALD, serving as a precursor that will later crystallize during annealing. This preliminary deposition at lower temperatures allows the use of temperature-sensitive substrates, while the subsequent crystallization step enhances electrochemical activity without exposing the substrate to excessive thermal stress
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
Enables the production of electrochemically active lithiated materials that conform to substrate microstructures, suitable for three-dimensional batteries, with improved electrochemical performance.
Implementation Method 1
at least one atomic layer deposition of a precursor of a first metal... at least one atomic layer deposition of a lithium precursor through said reaction chamber on top of said thin layer of an oxide of the first metal
Implementation Method 2
at least one diffusion of a first oxidizing species through said reaction chamber to obtain a thin layer of an oxide of the first metal
Implementation Method 3
a crystallization annealing step g) at a temperature of between 600° C. and 800° C. for a period of between 1 and 4 hours to obtain a lithiated material
Data Source
AI summary
The invention relates to a manufacturing method for manufacturing a positive electrode layer based on a lithiated material suitable for three-dimensional batteries, or 3D batteries, so as to obtain a lithiated material on a substrate, the lithiated material comprising several thin layers, i.e. layers that have thicknesses between 1 nm and 1 μm, are made up of electrochemically active complex materials, and are, inter alia, homogeneous and suitable for conforming to the raised patterns of greater or lesser complexity of the surface of the substrate on which the lithiated material is deposited.