Secondary Battery Electrode Structure for Lower Lithium Side Reactions

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Solution Overview

Problem

Existing electrode materials for secondary batteries suffer from increased lithium resistance due to side reactions during charge and discharge, leading to battery degradation and cracks from external impact.

Innovation Solution

The use of a base film with through holes as a binder, combined with a current collector, to bind active material particles and reduce lithium side reactions, while simplifying the manufacturing process.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If PTFE is used for fiberization to form active material sheet, then fiberization capability is improved, but lithium resistance increases due to side reactions

Engineering Contradiction:

Improvefiberization capabilityVSAvoidlithium resistance

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent introduces a binder as an intermediary substance between PTFE fibers and active material particles. The binder coats the PTFE fibers, preventing direct contact between lithium and PTFE, thereby reducing side reactions while maintaining the fiberization structure's mechanical benefits

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent creates a composite structure combining PTFE fibers with binder materials and active material particles. This composite approach leverages the fiberization capability of PTFE while using the binder to suppress harmful side reactions, achieving both manufacturing ease and lithium resistance

Inventive Principle:

Principle #40Composite materials

2Reliability

If composite binder including PTFE and PVDF or copolymer is used, then lithium side reactions are reduced, but fiberization structure becomes unsatisfactory

Engineering Contradiction:

Improvelithium side reaction suppressionVSAvoidfiberization structure

Core Design Contradiction:

ReliabilityVSShape

Solution Approach 1:

The patent applies different materials to different locations/functions: PTFE fibers provide the structural framework and fiberization, while the binder is locally applied to coat the fibers and interact with active material particles, creating distinct functional zones that resolve the contradiction between structure and reaction suppression

Inventive Principle:

Principle #3Local quality

3Reliability

If mixture of PTFE and CMC or PAA is used to minimize lithium resistance, then side reactions are reduced, but battery degradation occurs due to unsatisfactory fiberization structure

Engineering Contradiction:

Improvelithium resistanceVSAvoidbattery lifespan

Core Design Contradiction:

ReliabilityVSDuration of action of stationary object

Solution Approach 1:

The patent segments the electrode structure into distinct components: PTFE fibers form the structural skeleton, binder materials coat the fibers, and active material particles are distributed throughout. This segmentation allows each component to perform its optimal function, preventing the degradation that occurs when materials are improperly combined

Inventive Principle:

Principle #1Segmentation

Data Source

PatentEP4539135A1Electrode material for a secondary battery and method of manufacturing the same

Publication Date: 2025.04.16 IRM CO LTD

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AI summary

An electrode for a secondary battery and a method for manufacturing the same are disclosed, which reduces lithium side reactions, has a simple process, and can reduce cracks caused by external impact. The electrode material for a secondary battery according to an exemplary embodiment of the present invention comprises a base film with a plurality of through holes, a binder and a current collector. The binder includes active material particles dispersed therein and is fixed to the through holes. The current collector is attached to the base film.