Lithium Metal Anode Protective Coating for Dendrite Suppression
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Solution Overview
Problem
Lithium metal anodes face challenges in achieving high energy density and extended lifespan due to dendrite growth and uneven current density during electrochemical reactions, leading to internal short circuits and reduced stability.
Innovation Solution
A lithium metal anode precursor is developed with a current collector, a metal layer, and a protective coating layer composed of a carbon-based material and a binder polymerized from a high-strength monomer grafted onto a high-ion conductive monomer, which suppresses dendrite growth and enhances ion transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If lithium metal anode is used to increase energy density, then specific capacity is improved, but dendrite growth occurs leading to reduced lifespan
Solution Approach 1:
A protective coating layer comprising a carbon-based material and a binder is introduced as an intermediary between the lithium metal anode and the electrolyte. This coating layer prevents direct contact between the electrolyte and lithium metal, suppressing dendrite growth while maintaining high specific capacity, thus resolving the contradiction between energy density and lifespan
Solution Approach 2:
The protective coating layer is formed as a composite material combining a carbon-based material with a binder, where the binder contains specific functional groups that enhance both mechanical strength and ion conductivity. This composite structure provides both physical protection against dendrites and maintained electrochemical performance
2Reliability
If protective coating layer is formed on lithium metal anode, then dendrite growth is suppressed, but ion transfer efficiency may be reduced
Solution Approach 1:
The binder is designed with specific functional group ratios and molecular weight parameters optimized to balance mechanical strength and ion conductivity. By controlling these parameters, the coating layer achieves both dendrite suppression and high ion transfer efficiency, resolving the contradiction between reliability and productivity
3Strength
If binder polymer is used in protective coating layer, then mechanical strength is improved, but ion conductivity may be reduced
Solution Approach 1:
The binder is designed with specific functional groups distributed throughout the polymer structure, creating local regions with different properties. The main polymer chain provides mechanical strength while the functional groups create ion-conductive pathways, allowing both strength and ion conductivity to coexist in different local regions of the same material
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 precursor and anode design result in a lithium secondary battery with improved energy density and prolonged lifespan by stabilizing lithium deposition and preventing direct electrolyte contact, as demonstrated by increased cycle life in all-solid-state batteries.
Implementation Method 1
the binder is a polymer obtained by polymerizing a high-strength monomer grafted onto a high-ion conductive monomer or a polymer
Implementation Method 2
a high-strength monomer grafted onto a high-ion conductive monomer
Implementation Method 3
preventing direct electrolyte contact
Implementation Method 4
stabilizing lithium deposition
Data Source
Figure 1~2
Figure 3~5
AI summary
The present invention relates to a lithium metal anode, an anode precursor for same, and methods for producing anode and anode precursor. A lithium metal anode according to another aspect of the present invention comprises: a current collector; a metal layer formed on the current collector; and a protective coating layer formed on the metal layer, wherein the metal layer contains an alloy of lithium in the interface in contact with the protective coating layer, and the protective coating layer is a mixture of a carbon-based material and a binder, the binder may be a polymer obtained by polymerizing a high-strength monomer grafted onto a high-ion conductivity monomer.