Hydrophilic Lithium Metal Composite Anode for Dendrite Suppression
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Solution Overview
Problem
Lithium metal anodes in batteries are prone to forming dendrites, leading to poor performance, instability, and safety issues due to their hydrophobic nature, which hinders the absorption of liquid electrolytes and affects battery performance.
Innovation Solution
The development of hydrophilic lithium metal composite anodes by incorporating hydrophilic matter such as particles with functional groups like hydroxyl, carbonyl, or amino groups into the lithium metal, enhancing the anode's ability to interface with electrolytes at a contact angle less than 90 degrees, thereby improving wettability and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If lithium metal is used as anode material to achieve high capacity and low redox potential, then energy density is improved, but dendrite formation occurs leading to poor stability and safety
Solution Approach 1:
The patent applies composite materials by combining lithium metal with hydrophilic matter (such as hydroxyl, carbonyl, carboxyl, amino, sulfhydryl, phosphate groups, or their corresponding compounds) to create a composite anode structure. This composite approach maintains the high energy density of lithium metal while introducing hydrophilic properties that improve electrolyte wettability and suppress dendrite formation, thereby resolving the contradiction between energy density and stability.
Solution Approach 2:
The patent changes the surface property parameter of lithium metal by incorporating hydrophilic matter, transforming it from hydrophobic to hydrophilic. This parameter change improves electrolyte absorption and distribution, preventing dendrite formation while maintaining the high capacity characteristics of lithium metal, thus resolving the stability issue without sacrificing energy density.
2Productivity
If lithium metal is used to achieve high specific capacity, then battery performance is improved, but dendrite formation leads to short circuits and thermal instability
Solution Approach 1:
The hydrophilic matter acts as an intermediary between lithium metal and the electrolyte. It modifies the interface properties to promote uniform electrolyte distribution and lithium ion flux, preventing dendrite formation while maintaining the high specific capacity of lithium metal. The intermediary layer facilitates beneficial interactions without compromising the underlying lithium metal's electrochemical performance.
3Quantity of substance
If lithium metal is used as anode material, then high energy storage is achieved, but hydrophobic nature hinders electrolyte absorption
Solution Approach 1:
The patent changes the surface energy parameter of lithium metal by incorporating hydrophilic functional groups or compounds. This parameter transformation converts the hydrophobic surface into a hydrophilic one, enabling effective electrolyte wetting and absorption while preserving the high energy storage capacity of the lithium metal core.
Solution Approach 2:
By creating a composite structure where hydrophilic matter is integrated with lithium metal, the patent achieves a material that combines the high energy storage of lithium with the electrolyte-absorbing properties of hydrophilic components. The composite structure enables both high energy storage and effective electrolyte interaction.
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 hydrophilic lithium metal composite anodes exhibit improved discharge capacity retention, reduced impedance, and enhanced thermal stability, suppressing dendrite growth and maintaining performance over a longer cycle life compared to conventional lithium metal anodes.
Implementation Method 1
the at least one type of hydrophilic material is added to the portion of lithium metal via electrostatic spray deposition (ESD)
Implementation Method 2
the at least one type of hydrophilic matter comprises particles of one or more of a hydroxyl (—OH) group, a carbonyl (—C═O) group, a carboxyl (—COOH) group, and amino group
Data Source
AI summary
A method of forming a lithium metal composite anode for a battery is disclosed. One method includes providing a portion of lithium metal and adding at least one type of hydrophilic matter to a portion of lithium metal to adhere or embed the at least one type of hydrophilic matter to or into the portion of lithium metal to form a lithium metal composite anode.