Core-Shell 3D Anode Network for Dendrite-Resistant Cycling
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Solution Overview
Problem
Lithium and sodium-based batteries face issues such as instability due to volumetric changes, dendrite formation, and parasitic side reactions, leading to capacity loss and safety hazards, which conventional 3D anode structures fail to adequately address.
Innovation Solution
A three-dimensional (3D) anode configuration with a continuous, ion-conducting network is developed, where the anode active material forms a free-standing monolithic structure with a homogenous distribution of ion-conducting materials, minimizing dendrite formation and enhancing ion diffusion pathways.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional 3D anode structures are used, then the anode provides structural support, but ion diffusion pathways are limited and dendrite formation occurs
Solution Approach 1:
The patent employs a porous three-dimensional substrate (such as porous copper, nickel, or carbon-based foams) that provides extensive internal surface area and interconnected pore structures. This porous architecture enables uniform lithium ion diffusion throughout the bulk structure, preventing localized stress concentration and dendrite formation while maintaining structural integrity during cycling.
Solution Approach 2:
The patent introduces a protective coating layer (such as solid electrolyte interphase (SEI) stabilizing coatings, artificial SEI layers, or protective films) as an intermediary between the lithium-based anode material and the electrolyte. This intermediary layer prevents direct parasitic reactions, stabilizes the interface, and physically inhibits dendrite penetration while allowing ion transport.
2Quantity of substance
If lithium-based anode materials are used, then high theoretical capacity is achieved, but parasitic side reactions with electrolytes occur
Solution Approach 1:
The patent introduces a protective coating layer (such as solid electrolyte interphase (SEI) stabilizing coatings, artificial SEI layers, or protective films) as an intermediary between the lithium-based anode material and the electrolyte. This intermediary layer prevents direct parasitic reactions, stabilizes the interface, and physically inhibits dendrite penetration while allowing ion transport.
Solution Approach 2:
The patent employs composite anode structures combining lithium-based active materials with stable matrix materials (such as lithium alloys, lithium composites, or core-shell structures). The composite design isolates reactive lithium components, reducing their direct exposure to electrolyte while maintaining high capacity through the active lithium content.
3Speed
If high surface area substrates are used, then ion diffusion pathways are increased, but the structure transforms into a bi-layer configuration reducing effectiveness
Solution Approach 1:
The patent employs a porous three-dimensional substrate (such as porous copper, nickel, or carbon-based foams) that provides extensive internal surface area and interconnected pore structures. This porous architecture enables uniform lithium ion diffusion throughout the bulk structure, preventing localized stress concentration and dendrite formation while maintaining structural integrity during cycling.
Solution Approach 2:
The patent applies different functional properties to different regions of the anode structure. The porous substrate provides mechanical support and ion transport pathways, while the deposited active material provides electrochemical reactivity. The protective coating provides interface stabilization. This spatial differentiation of functions optimizes each component's performance while avoiding the bi-layer limitations.
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 stabilizes the anode volume, reduces dendrite formation, and improves cycling performance and power output, achieving high-rate capability and extended cycle life with high energy density.
Implementation Method 1
improves ion diffusion pathways
Data Source
AI summary
Current collectors are critical components of conventional electrochemical cell design, and serve to conduct electricity generated within the electrochemical cell to an external environment of the electrochemical cell, typically to a machine or device electrically coupled to the electrochemical cell, e.g. via a plurality of leads, tabs, contacts, terminals, etc. Accordingly, current collectors conventionally comprise one or more highly electrically conductive (and, optionally, thermally conductive) materials, most often metal(s) or alloy(s) of iron, nickel, copper, etc. As a result, current collectors often represent a substantial contribution to the total mass of the electrochemical cell, and undesirably reduce the power-to-weight ratio of the resulting battery. The presently disclosed inventive concepts include various configurations of free-standing electrodes that do not require a distinct current collector component to efficiently conduct electricity to external devices, and include unique compositions and structural arrangements that collectively convey substantial performance improvements on electrochemical cells implementing the same.