3D Printed Solid Electrolyte Foam for High Power Lithium-Air Batteries
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Solution Overview
Problem
Lithium-air batteries face challenges in achieving high power density and long cycle life due to limitations in existing solid-state electrolytes, which either result in low power density or short cycle life, depending on the type of electrolyte used.
Innovation Solution
A three-dimensional rechargeable lithium-air battery design utilizing a solid-state electrolyte with a deterministic foam structure, increasing the interface area to volume ratio and reducing ion travel distance, combined with micro and nano-scale geometric structuring, to enhance power density and cycle life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If solid-state electrolyte is used in lithium-air batteries, then cycle life is improved, but power density deteriorates
Solution Approach 1:
The patent transitions from traditional planar (2D) electrode-electrolyte interfaces to three-dimensional (3D) non-planar interfaces. The solid electrolyte is configured with a non-planar surface that creates extensive 3D contact areas with electrodes, dramatically increasing the effective interface area to volume ratio. This dimensional transformation enables solid-state electrolytes to achieve both long cycle life and high power density by providing abundant reaction sites while maintaining structural stability.
Solution Approach 2:
The patent employs porous or foam-like structures for the solid electrolyte and electrodes. These porous materials provide high surface area to volume ratios, enabling increased interface area between the solid electrolyte and electrodes. The porous structure facilitates ion transport pathways while maintaining the solid-state configuration, thereby achieving high power density without sacrificing cycle life.
2Power
If interface area to volume ratio is increased, then power density is improved, but material use increases
Solution Approach 1:
By creating non-planar, three-dimensional interfaces between the solid electrolyte and electrodes, the patent achieves dramatically increased interface area to volume ratios. This dimensional transformation allows the battery to achieve high power density with minimal material quantities, as the 3D structure provides extensive reaction surfaces within a compact volume, reducing overall material requirements by up to 20 times compared to conventional planar designs.
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 design achieves a 20 times reduction in material use and cost, with high energy density and efficiency, enabling widespread use in consumer electronics, vehicles, and grid power storage, while maintaining safety and stability.
Implementation Method 1
a solid electrolyte that is permeable to lithium ions but has a low electronic conductivity
Implementation Method 2
a layer of electrically conductive anode material located in the first non-overlapping volume and in contact with the solid electrolyte, wherein at least one part of the anode material is capable of undergoing electrochemical oxidation
Implementation Method 3
a porous electrically conductive thin cathode film located in the second non-overlapping volume
Data Source
AI summary
A scaffold of an electrolyte is fabricated in polymer material using 3D printing techniques. A thin layer of solid electrolyte is deposited on the scaffold followed by burning off the polymer. This leaves behind a 3D foam-like solid electrolyte with two distinct non-overlapping volumes. Lithium followed by a conductive layer (for anode) is then deposited through one volume on the first surface whereas a porous or non-porous conductive layer is deposited on the opposite surface through the second volume. The non-porous conductive layer on the second surface is made porous by a selective timed etch.