Layered Lithium Cobalt Oxide Films with Localized Co3O4 Seeding
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Solution Overview
Problem
Existing methods for producing lithium cobalt oxide films do not provide control over the morphology of the film, and none teach the production of crystalline lithium cobalt oxide with localized concentrations of Co3O4, which is necessary to achieve advantageous crystal orientations for improved lithium-ion battery performance.
Innovation Solution
A composition comprising Co3O4 and crystalline lithium cobalt oxide is formed using a method where separate vapor sources for each component element are used, and the elements are co-deposited onto a heated substrate to react and form the crystalline oxide, allowing for controlled formation of localized Co3O4 concentrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If existing methods for producing lithium cobalt oxide films are used, then the production process is simple, but control over the morphology of the film is not achieved
Solution Approach 1:
The production method is segmented into distinct sequential steps: depositing Co3O4 layer, depositing LiCoO3 layer, and performing controlled annealing. This segmentation allows each step to be optimized independently for achieving the desired morphology and crystal orientation, resolving the contradiction between precision control and process simplicity.
Solution Approach 2:
The Co3O4 layer is deposited as a preliminary seed layer before the LiCoO3 layer. This preliminary action provides a template that guides the subsequent formation of LiCoO3 with specific morphology and crystal orientation, enabling precise control over the final film structure without requiring complex in-situ control mechanisms.
2Manufacturing precision
If crystalline lithium cobalt oxide with localized concentrations of Co3O4 is produced, then advantageous crystal orientations are achieved, but the production method becomes more complex
Solution Approach 1:
Localized concentrations of Co3O4 are created within the LiCoO3 matrix by controlling the deposition and annealing processes. This local quality variation provides specific nucleation sites that guide crystal growth in desired orientations, achieving precise crystal orientation control through localized compositional modification rather than uniform complex processing.
Solution Approach 2:
The final product is a composite material consisting of LiCoO3 with localized Co3O4 concentrations. This composite structure combines the benefits of both phases: LiCoO3 provides the base crystal structure while localized Co3O4 regions act as orientation templates, achieving superior crystal orientation control through material composition design rather than process complexity.
3Reliability
If Co3O4 is localized within the lithium cobalt oxide, then electrochemical properties are enhanced, but the manufacturing process requires additional steps
Solution Approach 1:
The deposition of Co3O4 and LiCoO3 layers, followed by annealing, is merged into a single integrated process sequence. This combining of steps achieves the desired localized Co3O4 distribution and enhanced electrochemical properties while maintaining production efficiency, as the annealing step simultaneously completes the formation of both phases in their correct locations.
Solution Approach 2:
The annealing process allows the system to self-organize into the desired structure with localized Co3O4 concentrations. By providing the right thermal treatment conditions, the material system automatically forms the optimal distribution of phases and crystal orientations, reducing the need for additional complex manufacturing steps while achieving enhanced electrochemical performance.
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
The method enables the production of lithium cobalt oxide films with controlled morphology and crystal orientations, leading to improved electrochemical properties such as enhanced capacity and cycle life in lithium-ion batteries.
Implementation Method 1
separate vapor sources for each component element are used, and the elements are co-deposited onto a heated substrate to react and form the crystalline oxide
Implementation Method 2
the elements are co-deposited onto a heated substrate to react and form the crystalline oxide
Data Source
AI summary
Provided is a composition comprising:(a) a principal phase that is provided by a layered mixed metal oxide having a rocksalt structure belonging to the R-3m space group; the layered mixed metal oxide comprising the following component elements:45 to 55 atomic % lithium;20 to 55 atomic % of one or more transition metals selected from the group consisting of chromium, manganese, iron, nickel, cobalt, and combinations thereof; and0 to 25 atomic % of one or more additional dopant elements selected from the group consisting of: magnesium, calcium, strontium, titanium, zirconium, vanadium, copper, ruthenium, zinc, molybdenum, boron, aluminium, gallium, tin, lead, bismuth, lanthanum, cerium, gadolinium and europium;wherein said atomic % is expressed as a % of total atoms of said layered oxide, excluding oxygen;(b) a minor phase that is provided by a metal oxide that does not have the crystal structure of the layered mixed metal oxide, the minor phase comprising one or more of the transition metals contained in the layered mixed metal oxide, the transition metals being selected from the group consisting of chromium, manganese, iron, nickel, and cobalt.Methods of making the composition and electrodes and cells, especially solid-state batteries, containing the composition are also provided. The rough morphology of the crystals confers advantages compared with smoother crystals of similar chemical composition, particularly in solid-state batteries.