Nanostructured Carbon-Alloy Anodes for Uniform Ion Diffusion
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Solution Overview
Problem
Next-generation ion batteries face challenges with alloy-based anodes due to non-uniform ion diffusion leading to physical deterioration, high volume expansion, and reduced lifespan, particularly when using charge-carrying ions with larger ionic radii, which accelerates the deterioration process and causes capacity reduction.
Innovation Solution
A carbon-alloy-based anode material nanocomposite is developed through a diffusion-controlled induction process using dual-polymer protect-calcination and complexation, delaying phase separation and promoting a diffusion-controlled reaction that expands the one-phase reaction section, thereby enhancing ion storage and battery performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If alloy-based anode is used to achieve high energy density, then energy density is improved, but reversibility deteriorates due to non-uniform ion diffusion and volume expansion
Solution Approach 1:
The alloy-based anode is segmented into fine particles with size of 0.5 to 30 nm, which are then embedded in a carbon matrix. This segmentation reduces the diffusion distance for charge-carrying ions, enabling uniform ion distribution throughout the anode material and preventing the non-uniform diffusion that causes physical deterioration and reduces reversibility.
Solution Approach 2:
A composite structure is created by embedding alloy-based anode material particles within a carbon matrix to form a carbon-alloy-based anode material nanocomposite. The carbon matrix provides structural stability and conducts electrons, while the alloy particles provide high capacity. This composite structure accommodates volume expansion and maintains reversibility during charging and discharging cycles.
2Duration of action of stationary object
If particle size is reduced to suppress particle fragmentation, then lifespan is improved, but reaction mechanism remains interface-controlled with slow diffusion
Solution Approach 1:
The particle size parameter is changed to an ultra-fine range of 0.5 to 30 nm, which fundamentally alters the reaction mechanism. At this scale, the interface-controlled reaction transitions to a diffusion-controlled reaction, where ions diffuse uniformly throughout the particle interior rather than being limited to surface reactions. This parameter change simultaneously achieves particle fragmentation suppression and enhances ion diffusion speed.
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 approach results in improved battery lifespan and high output by enabling uniform interfacial diffusion, reducing mechanical deterioration, and allowing for the storage of alkali ions through a non-equilibrium reaction, effectively expanding the application to various next-generation ion batteries like lithium, sodium, zinc, and aluminum ion batteries.
Implementation Method 1
a diffusion-controlled reaction (DCR)... a case in which a diffusion rate of ions inside the anode determines an overall reaction
Implementation Method 2
the carbon-alloy-based anode material nanocomposite may store the alkali ions via the non-equilibrium reaction that is a reaction of forming a solid solution alloy as the alkali ions are intercalated into the alloy-based anode material particles
Data Source
AI summary
Disclosed is a diffusion controlled reaction based alloying anodes through nanostructuring. The diffusion controlled reaction based alloying anode includes a carbon-alloy-based anode material nanocomposite composed of a carbon matrix and alloy-based anode material particles and formed via a diffusion-controlled induction process that is means for inducing the diffusion-controlled reaction.