Bamboo-Fiber Binder Networks for Thick Li-Ion Electrodes
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Solution Overview
Problem
Thick electrodes in electrochemical cells face performance issues due to limited lithium ion passageways and physiochemical changes in polymer binders, leading to reduced adhesion and delamination.
Innovation Solution
Incorporation of a polymer binder network with bamboo-type fibers, comprising beads and filaments, which form a cylindrical structure to maintain lithium ion flow and enhance adhesion, allowing for thicker electrodes with improved cycling performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If thicker electrodes are used to increase energy density, then the relative amount of electroactive materials increases, but lithium ion passageways become limited and performance deteriorates
Solution Approach 1:
The polymer binder is segmented into bamboo-type fibers with internal hollow cavities and radial filaments, creating a hierarchical porous structure that provides multiple lithium ion passageways within the binder itself, resolving the conflict between high electroactive material loading and adequate ion transport
Solution Approach 2:
The bamboo-type fiber structure incorporates internal hollow cavities and radial filaments that form a porous network, enabling efficient lithium ion diffusion pathways through the polymer binder phase, thus maintaining ion transport performance even with thicker electrodes
2Quantity of substance
If thicker electrodes are used to increase energy density, then the relative amount of electroactive materials increases, but polymer binder undergoes physiochemical changes leading to delamination
Solution Approach 1:
The segmented bamboo-type fiber structure with radial filaments creates a network that mechanically interlocks with electroactive material particles, distributing stress and preventing delamination during binder physiochemical changes in thick electrodes
Solution Approach 2:
The bamboo-type fiber combines hollow cavity structure with radial filament arrangements to create a composite polymer binder system that maintains structural integrity and adhesion under the mechanical and chemical stresses experienced in thick electrode applications
3Ease of manufacture
If traditional polymer binder structures are used, then manufacturing is simple, but adhesion is insufficient and delamination occurs in thick electrodes
Solution Approach 1:
The bamboo-type fibers are pre-formed with hollow cavities and radial filaments before electrode assembly, allowing the complex three-dimensional adhesion structure to be manufactured separately and then integrated into the electrode, maintaining both manufacturing feasibility and enhanced adhesion performance
Data Source
AI summary
The present disclosure provides an electrode for an electrochemical cell. The electrode includes a polymer binder network and a plurality of electroactive material particles. The polymer binder network includes a plurality of fibers defining the polymer binder network. Each of the plurality of fibers includes a plurality of beads and a plurality of filaments. The plurality of filaments extends from at least a portion of the plurality of beads, respectively. The plurality of electroactive material particles is in voids of the polymer binder network. In certain aspects, the present disclosure provides a single- or double-sided electrode component including a current collector and the electrode.