Anode-Free Solid-State Battery Layers for Dendrite-Free Fast Charging
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Solution Overview
Problem
Lithium-ion batteries face dendritic growth issues due to uneven lithium distribution, leading to short-circuiting and catastrophic failure, especially at faster charging rates, which existing buffer layers fail to adequately prevent.
Innovation Solution
An anode-free solid-state lithium-ion battery cell with an anti-dendrite functional layer and a scaffold layer is introduced, where the anti-dendrite functional layer forms a strong bond with lithium ions and guides them towards the scaffold layer, preventing dendritic growth by enhancing interfacial adhesion and controlling lithium diffusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing buffer layers are used to prevent dendritic growth, then some protection is provided, but they fail to adequately prevent dendritic growth at faster charging rates
Solution Approach 1:
The anti-dendrite functional layer is segmented into multiple distinct layers: a first anti-dendrite sub-layer in contact with the electrolyte layer, and a second anti-dendrite sub-layer in contact with the conductive layer. This segmentation allows each sub-layer to perform specialized functions - the first sub-layer prevents dendrite initiation from the electrolyte side, while the second sub-layer provides a safe lithium deposition site, collectively solving the inadequate protection at high charging rates
Solution Approach 2:
The anti-dendrite functional layer acts as an intermediary between the electrolyte layer and the conductive layer. It mediates the lithium ion transfer process by providing a controlled interface that guides lithium plating to the conductive layer interface while blocking direct dendritic growth into the electrolyte, enabling safe high-rate charging
2Reliability
If the anti-dendrite functional layer has higher interfacial adhesion to the electrolyte layer, then dendritic growth is restricted, but lithium plating must be guided to the conductive layer interface
Solution Approach 1:
The anti-dendrite functional layer exhibits local quality variations through its different sub-layers with distinct adhesion properties. The first sub-layer has higher adhesion to the electrolyte layer to restrict dendrite growth, while the second sub-layer interfaces with the conductive layer to guide lithium plating. This spatial variation in adhesion quality enables simultaneous dendrite prevention and controlled lithium deposition without requiring complex overall interface design
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 solution effectively prevents dendritic growth and enhances lithium ion diffusion, improving the operational endurance and safety of lithium-ion batteries by spatially restricting lithium plating and accumulation.
Implementation Method 1
the anti-dendrite functional layer can bond with lithium ions transferred from the cathode layer through the electrolyte layer to form an alloy with the lithium material
Implementation Method 2
The solid electrolyte can have a first side and a second side to transfer ions between the first side and the second side
Data Source
AI summary
Provided herein are various battery cell embodiments. A battery cell can have a solid electrolyte. The electrolyte can be arranged within the cavity. The battery cell can have a cathode disposed within the cavity along a first side of the electrolyte. The battery cell can have a functional layer disposed within the cavity along a second side of the electrolyte. A first side of the functional layer can be in contact with a second side of the electrolyte. The functional layer can form an alloy with lithium material received via the electrolyte. The battery cell can have a scaffold layer disposed within the cavity along a second side of the functional layer.