MXene-Coated Polymer Separators for Lithium Dendrite Restraint

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Solution Overview

Problem

Lithium metal anodes face challenges such as short lifespan and safety risks due to dendrite growth during plating/stripping, which can disrupt battery separators and lead to safety hazards.

Innovation Solution

The use of a polymeric film coated with a MXene material on at least one side, which helps in uniform Li nucleation and forms a stable solid-electrolyte-inter-phase (SEI) with fluorine functional groups, thereby restraining lithium dendrite growth.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Duration of action of moving object

If traditional separators are used in lithium metal anodes, then the battery structure is simple and easy to manufacture, but the lifespan is short due to dendrite growth disrupting the separator

Engineering Contradiction:

Improvelifespan of lithium metal anodeVSAvoidcomplexity of separator structure

Core Design Contradiction:

Duration of action of moving objectVSDevice complexity

Solution Approach 1:

The patent applies composite materials by combining MXene (a two-dimensional transition metal carbide, nitride, or carbonitride) with polymeric film materials to create a separator that prevents lithium dendrite growth. The MXene layers form a stable solid-electrolyte interphase (SEI) that restrains dendrite penetration, extending battery lifespan from approximately 100 hours to over 1300 hours while maintaining structural integrity.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent implements local quality by coating the polymeric film with MXene material on at least one side to create a functional gradient. The MXene coating is applied selectively to the side facing the lithium metal anode, providing localized dendrite prevention where it is most needed while maintaining the bulk properties of the polymeric film for porosity and ion transport.

Inventive Principle:

Principle #3Local quality

2Use of energy by moving object

If lithium metal anodes are used to achieve ultrahigh theoretical gravimetric capacity, then energy density is improved, but safety risks increase due to dendrite growth impaling separators

Engineering Contradiction:

Improvegravimetric capacity of anodeVSAvoidsafety risks from dendrite growth

Core Design Contradiction:

Use of energy by moving objectVSObject-affected harmful factors

Solution Approach 1:

The patent uses MXene as an intermediary layer between the lithium metal anode and the polymeric separator. This intermediate MXene coating forms a stable solid-electrolyte interphase that mediates lithium ion deposition, promoting uniform nucleation and preventing direct contact between growing dendrites and the separator, thereby eliminating safety risks while preserving high capacity.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent changes the surface properties and chemical composition of the separator by introducing MXene material with specific fluorine functional groups. This parameter change creates a stable solid-electrolyte interphase with different electrochemical properties that prevent dendrite formation, allowing the system to maintain high energy density without safety compromises.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If MXene material is coated on polymeric film to prevent dendrite growth, then separator reliability is improved, but manufacturing complexity increases

Engineering Contradiction:

Improvereliability of separator in preventing dendrite disruptionVSAvoidease of coating MXene on polymeric film

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent applies preliminary action by pre-coating the polymeric film with MXene material before battery assembly. This advance preparation ensures that the separator is already equipped with dendrite-prevention functionality, eliminating the need for complex post-assembly modifications and simplifying the overall manufacturing process while ensuring reliable performance from the first cycle.

Inventive Principle:

Principle #10Preliminary action

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 MXene-polymer composite separators significantly improve the lifespan of lithium metal anodes, extending the cycle life of symmetric Li|Li cells from approximately 100 hours with traditional separators to over 1300 hours, while enhancing safety by preventing dendrite disruption.

Implementation Method 1

a highly stable solid-electrolyte-inter-phase (SEI) derived from fluorine functional groups that can be present

Methodology Applied

Scientific EffectSolid-electrolyte-inter-phase formation:

Implementation Method 2

useful choice to induce uniform Li nucleation and a highly stable solid-electrolyte-inter-phase (SEI)

Methodology Applied

Scientific EffectNucleation: Nucleation

Implementation Method 3

Methodology Applied

Scientific EffectPhysical barrier separation: Physical Containment

Data Source

PatentUS20250149737A1Mxene-polymer separators for li-ion batteries

Publication Date: 2025.05.08 DREXEL UNIV

AI summary

This disclosure is directed to composites comprising a polymeric film coated on one or both sides with a MXene material, as well as lithium metal electrodes and components thereof, including MXene-polymer composite separators.