Star Polymer Coated Metallic Anodes for Dendrite Suppression
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Solution Overview
Problem
Metallic anodes such as lithium, sodium, and magnesium in energy storage devices face challenges due to dendrite growth, leading to electrochemical instability and electrical shorting, and existing protective coatings struggle to maintain energy density while being thin enough.
Innovation Solution
Application of an ultra-thin coating of amphiphilic conformal star polymers with an ionically non-conductive core and ionically conductive arms on metallic anodes, which self-assemble to form a molecular layer that suppresses dendrite formation and enhances cyclability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protective coating is applied on metallic anodes to suppress dendrite growth, then electrochemical stability is improved, but coating thickness must be kept thin to retain energy density
Solution Approach 1:
The patent employs an ultrathin protective coating film on the metallic anode surface that is thin enough to maintain high energy density while providing sufficient protection against dendrite growth. The coating forms a conformal layer that covers the anode surface uniformly without adding significant thickness.
Solution Approach 2:
The protective coating is composed of composite materials with specific properties that enable both protection and thinness. The coating incorporates ionically conductive components that allow ion transport while maintaining structural integrity and protective function at ultrathin dimensions.
2Reliability
If conventional coating methods are used on highly reactive metallic anodes, then protection is achieved, but the coating process becomes complex and requires highly controlled inert environments
Solution Approach 1:
The coating process utilizes self-assembly mechanisms where the coating materials automatically organize themselves on the metallic anode surface without requiring complex external control systems. The coating materials are designed to spontaneously form the protective layer under simplified conditions.
Solution Approach 2:
The patent introduces intermediary coating materials that mediate between the highly reactive metallic anode and the external environment. These intermediary layers provide protection while being applied through simplified processes that do not require highly controlled inert environments.
3Quantity of substance
If the coating is made thinner to retain energy density, then energy density is maintained, but protection against dendrite formation becomes less effective
Solution Approach 1:
The coating is designed with local quality variations where different regions of the ultrathin coating have specialized functions. Certain areas provide enhanced dendrite suppression while maintaining overall thinness, with the coating structure optimized at the nanoscale to provide targeted protection.
Solution Approach 2:
The ultrathin coating incorporates porous structures that provide high surface area and enhanced protective function within a thin profile. The porous architecture allows ion transport while providing multiple interfaces for dendrite suppression without increasing coating thickness.
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 star polymer coating effectively prevents dendrite growth, improves electrochemical performance, and retains energy density, demonstrating improved cyclability and charge transfer kinetics in energy storage devices.
Implementation Method 1
The star polymers can, in some embodiments, self-assemble on the surfaces of the metallic anodes and form an ultrathin molecular layer thereon
Implementation Method 2
The nano-scale pattern in the coating protects the surfaces of the anode by suppressing dendrite formation
Data Source
AI summary
An energy storage device includes a coated anode. The coated anode includes a metallic anode in contact with an electrically non-conductive star polymer coating. The star polymers in the star polymer coating include a core with at least 3 arms attached to the core. At least some of the arms of the star polymers have ionically conductive polar functional groups. The energy storage device further includes a cathode and an electrolyte in contact with both the cathode and the coated anode.