Metal Nanoparticle Anode Current Collector for Dendrite Control
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Solution Overview
Problem
Metal batteries face dendrite growth issues leading to short-circuiting and reduced cycle performance due to unstable solid electrolyte interface (SEI) film formation during metal deposition and peeling, affecting reliability and efficiency.
Innovation Solution
An anode current collector with metal nanoparticles on a metal substrate, where the metal nanoparticles are the same as the substrate material, reducing nucleation overpotential and enhancing binding force, thereby improving reliability and cycle performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If metal batteries use a conventional anode structure, then energy density can be increased, but dendrite growth occurs leading to short-circuiting and reduced reliability
Solution Approach 1:
The patent applies local quality by creating metal nanoparticle modifications at specific locations on the anode current collector surface. These nanoparticles are distributed throughout the active area to provide localized nucleation sites, ensuring uniform metal deposition and preventing dendrite formation in high-stress regions while maintaining overall high energy density
2Use of energy by moving object
If metal batteries use a conventional anode structure, then energy density can be increased, but unstable SEI film formation occurs during metal deposition and peeling, reducing cycle performance
Solution Approach 1:
The patent applies preliminary action by pre-forming a stable SEI film on the anode current collector before actual battery operation. The metal nanoparticles catalyze SEI formation during initial cycles, creating a stable protective layer that prevents continuous electrolyte decomposition and maintains structural integrity during repeated metal deposition and peeling cycles
Solution Approach 2:
The patent applies parameter changes by modifying the surface properties of the anode current collector through metal nanoparticle deposition. This changes the surface energy and catalytic properties, promoting stable SEI formation and uniform metal nucleation, which transforms the unstable interface into a stable, reusable structure that enhances cycle performance
3Reliability
If metal nanoparticles are added to the anode current collector, then nucleation overpotential is reduced and binding force is enhanced, but device complexity increases
Solution Approach 1:
The patent applies porous materials by using a three-dimensional porous copper framework as the anode current collector. This porous structure provides high surface area for nanoparticle deposition and ion transport while maintaining mechanical integrity. The porous architecture naturally facilitates uniform nanoparticle distribution and reduces the amount of metal nanoparticles needed, simplifying the overall structure while enhancing performance
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 anode current collector effectively reduces dendrite formation and enhances the cycle performance and reliability of metal batteries by providing stable nucleation points and uniform metal deposition.
Implementation Method 1
The metal nanoparticles located on the at least part of the surface of the metal substrate can serve as active points for induced nucleation, thereby effectively reducing a nucleation overpotential of the anode current collector
Implementation Method 2
The material of the metal nanoparticles is the same as the first metal element in the metal substrate. Therefore, in a process of charging or discharging the battery, a binding force between a metal such as lithium or sodium and the metal nanoparticles is higher
Implementation Method 3
The anode current collector effectively reduces dendrite formation and enhances the cycle performance and reliability of metal batteries by providing stable nucleation points and uniform metal deposition
Data Source
AI summary
An anode current collector and a preparation method therefor, a battery cell, a battery, and an electric device. The anode current collector includes a metal substrate and metal nanoparticles located on at least part of a surface of the metal substrate; and the metal substrate includes a first metal element, and the first metal element is made of a material the same as the metal nanoparticles.