Polymeric Single-Ion Conductor Coating for Metal Battery Anodes
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Solution Overview
Problem
Lithium, sodium, and zinc-based negative electrodes in secondary metal-ion batteries tend to form dendrites during cell cycling, leading to reduced abuse tolerance and cell life due to uneven current distribution.
Innovation Solution
A polymeric single-ion conductor coating is applied to the metal substrate, formed from a metal salt of a sulfonated tetrafluoroethylene-based fluoropolymer copolymer or a polymeric metal salt with pendent metal salt groups, which evenly distributes cations across the surface, suppressing dendrite growth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a metal substrate (lithium, sodium, or zinc) is used as a negative electrode in secondary metal-ion batteries, then high energy density and power capability are achieved, but dendrites form during cell cycling leading to reduced abuse tolerance and cell life
Solution Approach 1:
A polymeric single-ion conductor coating is introduced as an intermediary layer between the metal substrate and the electrolyte. This coating mediates the interaction by providing a controlled interface that guides ion transport and prevents direct contact between the metal and electrolyte, thereby suppressing dendrite formation while maintaining high energy density
Solution Approach 2:
The invention changes the physical and chemical parameters of the electrode surface by applying a polymeric coating with specific ionic conductivity properties. This modifies the local electric field distribution and ion transport characteristics, transforming the electrode interface to prevent dendrite growth without sacrificing the underlying metal's high energy density
2Power
If a metal substrate (lithium, sodium, or zinc) is used as a negative electrode in secondary metal-ion batteries, then high power capability is achieved, but uneven current distribution causes dendrite formation reducing cell life
Solution Approach 1:
The polymeric single-ion conductor coating provides locally optimized properties at the electrode surface, creating uniform current distribution zones that prevent dendrite initiation. The coating's ionic conductivity and surface morphology are specifically designed to ensure homogeneous current density across the entire electrode surface during high-power operation
Solution Approach 2:
The polymeric coating acts as a mediator that decouples the high power capability of the metal substrate from its tendency to form dendrites. It provides a controlled ion transport pathway that maintains high current densities necessary for power while preventing the localized stress concentrations that lead to dendrite formation and reduced cell life
3Reliability
If a polymeric single-ion conductor coating is applied to the metal substrate, then dendrite growth is suppressed and abuse tolerance is enhanced, but additional manufacturing steps and coating materials are required
Solution Approach 1:
The invention uses a thin polymeric film coating rather than bulk materials or complex multi-layer structures. This thin-film approach minimizes the added manufacturing complexity while providing sufficient dendrite suppression functionality, making the process compatible with existing battery manufacturing lines
Solution Approach 2:
The solution employs a composite structure combining the metal substrate with a polymeric single-ion conductor coating. This composite approach leverages the high energy density of the metal while adding the dendrite-suppressing properties of the polymer, achieving enhanced reliability through a relatively simple composite material system
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 even distribution of current prevents dendrite formation, enhancing the abuse tolerance and lifespan of the batteries by ensuring consistent charge cycling.
Implementation Method 1
a polymeric single-ion conductor coating formed on a surface of the metal substrate
Data Source
AI summary
A negative electrode includes a metal substrate and a polymeric single-ion conductor coating formed on a surface of the metal substrate. The metal substrate is selected from the group consisting of lithium, sodium, and zinc. The polymeric single-ion conductor coating is formed of i) a metal salt of a sulfonated tetrafluoroethylene-based fluoropolymer copolymer or ii) a polymeric metal salt having an initial polymeric backbone and pendent metal salt groups attached to the initial polymeric backbone.