Ceramic-Polymer Composite Electrode Protection for Lithium Batteries

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Solution Overview

Problem

The commercialization of lithium metal anodes in electrochemical cells is hindered by reactivity, dendrite formation, electrolyte compatibility, fabrication, and safety issues, which reduce the cycle life and energy density of lithium batteries.

Innovation Solution

A composite protective structure for electrodes in electrochemical cells, comprising a polymer matrix with patterned cavities filled with ceramic material, providing ionic communication and mechanical flexibility to inhibit undesirable electrolyte components while promoting desirable ion passage, thereby enhancing the structural and functional integrity of the electrodes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a protective structure is added to protect lithium metal anodes from electrolyte reactivity and dendrite formation, then electrode safety and cycle life are improved, but ionic conductivity and mechanical flexibility may be reduced

Engineering Contradiction:

Improvecycle lifeVSAvoidstructural complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The protective structure employs a composite design combining a polymer matrix with ceramic material fillers. The polymer matrix provides mechanical flexibility and ion transport pathways, while the ceramic particles enhance chemical stability and inhibit dendrite formation. This composite approach allows the protective structure to simultaneously achieve reliability improvement (cycle life extension through dendrite inhibition and chemical stability) while maintaining acceptable ionic conductivity and mechanical flexibility through the polymer component.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The protective structure implements local quality by creating regions with different properties within the same structure. The polymer matrix regions provide flexibility and ion conduction, while the ceramic-filled regions provide chemical stability and dendrite resistance. This spatial differentiation of material properties allows different parts of the protective structure to fulfill different functional requirements, resolving the contradiction between protection effectiveness and ion transport capability.

Inventive Principle:

Principle #3Local quality

2Stability of the object's composition

If a protective structure with ceramic material is used to inhibit dendrite formation, then electrode stability is improved, but manufacturing complexity and fabrication difficulty increase

Engineering Contradiction:

Improveelectrode stabilityVSAvoidfabrication difficulty

Core Design Contradiction:

Stability of the object's compositionVSEase of manufacture

Solution Approach 1:

The protective structure is fabricated and attached to the lithium metal anode before the electrode is inserted into the electrochemical cell. This preliminary action allows the protective structure to be pre-formed with its complex composite architecture (polymer matrix with ceramic particles) under controlled manufacturing conditions, rather than attempting to create or apply it in situ. The pre-fabricated protective structure can then be easily integrated into the electrode assembly, reducing overall manufacturing complexity while achieving the desired electrode stability through dendrite inhibition and chemical protection.

Inventive Principle:

Principle #10Preliminary action

3Object-affected harmful factors

If a protective structure is implemented to prevent electrolyte compatibility issues, then safety is improved, but weight and volume of the anode increase

Engineering Contradiction:

Improveelectrolyte compatibilityVSAvoidanode weight

Core Design Contradiction:

Object-affected harmful factorsVSWeight of moving object

Solution Approach 1:

The protective structure applies partial action by providing localized protection only where and when needed - at the interface between the lithium metal anode and the electrolyte. Rather than replacing the entire anode or using excessive protective layers, the thin protective structure (polymer matrix with ceramic particles) provides sufficient protection against electrolyte reactivity and dendrite formation without adding significant weight or volume. This partial protection approach achieves improved electrolyte compatibility while minimizing the impact on anode weight.

Inventive Principle:

Principle #16Partial or excessive 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 composite structure minimizes the detrimental effects of defects, reduces cracking susceptibility, and maintains high ionic conductivity, leading to improved cycle life and energy density of lithium batteries while ensuring mechanical robustness and flexibility.

Implementation Method 1

Each ceramic-filled cavity is in ionic communication with the base layer. The protective structure has an average ionic conductivity of at least 10^-7 S/cm.

Methodology Applied

Scientific EffectIonic conduction: Conduction (electrical)

Data Source

PatentUS11041248B2Ceramic/polymer matrix for electrode protection in electrochemical cells, including rechargeable lithium batteries

Publication Date: 2021.06.22 SION POWER CORP

AI summary

Articles and methods for forming ceramic/polymer composite structures for electrode protection in electrochemical cells, including rechargeable lithium batteries, are presented.