Alumina Interfacial Layer for Solid-State Battery Anode Oxidation
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Solution Overview
Problem
Conventional solid-state lithium-based thin-film batteries face issues with uneven lithium distribution, anode oxidation, slow charging rates, and low capacity, necessitating a solution for enhanced performance and safety.
Innovation Solution
The development of an all solid-state lithium-based thin-film battery with a specific stack structure including an anode-side electrode, an aluminum oxide interfacial layer, a solid-state electrolyte layer, a lithiated cathode material layer, and a cathode-side electrode, where the anode-side is formed first, followed by the cathode-side, and featuring a continuous aluminum oxide interfacial layer to improve lithium distribution and reduce oxidation, enabling fast charging and high capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional solid-state lithium-based batteries are formed with cathode side first, then anode side, then lithium-containing anode region undergoes oxidation and lithium distribution becomes uneven, but if anode side is formed first with aluminum oxide interfacial layer, then oxidation is reduced and lithium distribution is improved
Solution Approach 1:
An aluminum oxide interfacial layer is introduced as an intermediary between the anode-side electrode and the solid-state electrolyte layer. This intermediate layer prevents direct contact and chemical reaction between the anode region and electrolyte, thereby reducing anode oxidation while also providing a controlled interface for uniform lithium distribution during charging cycles.
Solution Approach 2:
The anode-side electrode and aluminum oxide interfacial layer are formed prior to forming the cathode layer and solid-state electrolyte layer. This preliminary formation of the anode structure with protective coating before electrolyte deposition prevents oxidation during subsequent processing and ensures uniform lithium distribution from the start of battery operation.
2Quantity of substance
If conventional batteries use larger capacity materials, then energy storage increases, but device weight and size increase, but if thin-film solid-state batteries are used, then device size and weight are reduced, but charging rate and capacity are limited
Solution Approach 1:
The patent changes the physical and chemical parameters of the battery components by using thin-film deposition techniques to create highly dense, uniform layers with optimized thicknesses. The aluminum oxide interfacial layer provides controlled lithium ion transport properties, while the solid-state electrolyte layer enables fast ion conduction, collectively achieving high capacity in a lightweight thin-film configuration.
3Loss of time
If conventional batteries use traditional charging rates, then battery life is extended, but charging time increases, but if fast charging is implemented, then charging time is reduced, but battery reliability and performance degrade
Solution Approach 1:
The patent replaces traditional liquid electrolyte systems with a solid-state electrolyte layer that enables controlled lithium ion transport. The aluminum oxide interfacial layer further regulates ion flow at the anode interface, allowing fast charging rates (3C or greater) while maintaining uniform lithium distribution and preventing degradation through controlled ion transport mechanics.
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 configuration results in improved performance with high reliability, fast charge rates exceeding 3 C, and specific charge capacity greater than 50 mAh/g, addressing the limitations of conventional batteries.
Implementation Method 1
the lithium-containing anode region may undergo oxidation. Moreover, and in some cases, the anode region of a conventional solid-state, lithium-based battery has an uneven distribution of lithium
Implementation Method 2
a solid-state electrolyte layer located on a physically exposed surface of the aluminum oxide interfacial layer
Data Source
AI summary
An all solid-state lithium-based thin-film battery is provided. The all solid-state lithium-based thin-film battery includes a battery material stack of, from bottom to top, an anode-side electrode, an anode region, an aluminum oxide interfacial layer, a solid-state electrolyte layer, a cathode layer, and a cathode-side electrode layer. The all solid-state lithium-based thin-film battery stack is formed by first forming the anode-side of the battery stack and thereafter forming the cathode-side. All solid-state lithium-based thin-film batteries including the aluminum oxide interfacial layer located between the anode region and the solid-state electrolyte layer have improved performance, high capacity, and high reliability.