Electrode Edge Protection via Tapered Design and Coatings

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Solution Overview

Problem

Electrochemical cells face issues with stress on protective layers and component damage due to uneven utilization of electrode active material at the edges, leading to reduced lifespan and potential short-circuiting.

Innovation Solution

Implementing a tapered edge design and coatings on the cathode edge region with polymers or inert materials to reduce electrolyte uptake and conductivity, thereby minimizing edge region activity and preventing over-utilization.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If the electrode edge region has high accessibility to electrolyte and high conductivity, then electrochemical reactions can occur at the edges, but this leads to over-utilization of active material at edges and stress on protective layers

Engineering Contradiction:

Improveelectrochemical reaction activityVSAvoidprotective layer integrity

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent applies local quality by creating a coated region at the electrode edge with different properties than the central region. The coating reduces electrolyte accessibility and conductivity specifically at the edge region where over-utilization occurs, while leaving the central region unchanged to maintain high productivity. This spatial differentiation of properties resolves the contradiction between edge reactivity and protective layer integrity.

Inventive Principle:

Principle #3Local quality

2Quantity of substance

If the electrode utilizes active material uniformly across all regions, then overall capacity is maximized, but edge regions experience over-utilization leading to dendrite growth and short-circuiting

Engineering Contradiction:

Improveactive material utilizationVSAvoiddendrite growth and short-circuiting

Core Design Contradiction:

Quantity of substanceVSObject-affected harmful factors

Solution Approach 1:

The coating applied to the edge region creates local quality differences that reduce electrolyte accessibility and conductivity at edges. This prevents over-utilization of active material at edge regions while maintaining uniform utilization in the central region, thereby maximizing overall capacity without inducing dendrite growth or short-circuiting.

Inventive Principle:

Principle #3Local quality

3Ease of manufacture

If the electrode edge is sharply defined, then manufacturing is simplified, but stress concentrates at the edge leading to component damage

Engineering Contradiction:

Improveedge definitionVSAvoidedge region durability

Core Design Contradiction:

Ease of manufactureVSStrength

Solution Approach 1:

The patent applies beforehand cushioning by coating the edge region with material that provides a transition zone. This coating acts as a cushion that distributes stress more evenly across the edge region, preventing stress concentration and component damage while maintaining the simplified sharp edge geometry for manufacturing.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

Data Source

PatentUS10720648B2Electrode edge protection in electrochemical cells

Publication Date: 2020.07.21 SION POWER CORP

AI summary

Methods and apparatuses for protecting the edge of electrodes and other layers in electrochemical cells are generally described.