Negative Electrode Ferroelectric Particle Attachment
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Solution Overview
Problem
Existing methods for manufacturing negative electrodes for nonaqueous electrolyte secondary batteries fail to effectively utilize ferroelectric particles as additives, leading to decreased high-rate characteristics due to the binder interposing between the particles, which hinders the catalytic action of ferroelectric particles in reducing reaction resistance for lithium ions.
Innovation Solution
A method involving the direct attachment of ferroelectric particles to negative electrode active material particles without a binder, followed by forming granulated particles and applying pressure to create a sheet-shaped negative electrode mixture layer, ensuring the ferroelectric particles maintain their catalytic action and improve high-rate characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If negative electrode active material particles, binder, and ferroelectric particles are collectively mixed with each other, then the manufacturing process is simple, but the binder is interposed between the negative electrode active material particles and the ferroelectric particles, preventing the catalytic action of ferroelectric particles
Solution Approach 1:
The manufacturing process is divided into two distinct mixing stages: first mixing only the negative electrode active material particles and ferroelectric particles to form first composite particles, then mixing these first composite particles with the binder to form granulated particles. This segmentation ensures that the binder does not interfere with the direct attachment and catalytic action between ferroelectric particles and active material particles.
Solution Approach 2:
The ferroelectric particles are preliminarily attached to the negative electrode active material particles before the binder is introduced. This preliminary action ensures that the catalytically active interface is established first, and the binder is subsequently added without disrupting this critical attachment.
2Reliability
If ferroelectric particles are directly attached to negative electrode active material particles without binder, then the catalytic action is maximized, but the binding strength between particles decreases
Solution Approach 1:
The mixture is segmented into two functional components: first composite particles containing the catalytically active attachment of ferroelectric particles to active material particles, and binder material. This segmentation allows the catalytic interface to form without binder interference, while the binder is subsequently added to provide mechanical binding strength.
Solution Approach 2:
The first composite particles act as an intermediary structure that maintains the direct ferroelectric particle-to-active material particle attachment for catalysis, while also serving as the foundation for binder attachment to provide mechanical strength. The binder attaches to the surface of these composite particles rather than interfering with the internal catalytic interface.
3Stability of the object's composition
If binder is added to mix with negative electrode active material particles and ferroelectric particles, then the electrode structure is maintained, but the proportion of ferroelectric particles directly attached to active material particles decreases
Solution Approach 1:
The critical catalytic attachment of ferroelectric particles to active material particles is performed as a preliminary action before the binder is introduced. This ensures that the maximum proportion of direct attachments is established first, and the subsequent binder addition does not disrupt or reduce this attachment proportion.
Solution Approach 2:
The mixing process is segmented into two distinct operations: first forming first composite particles with direct ferroelectric-to-active material attachments, then forming granulated particles by mixing these first composite particles with binder. This segmentation preserves the catalytic interface while adding structural stability.
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
This approach enhances the high-rate characteristics of the negative electrode by promoting desolvation of lithium ions and reducing activation energy, while maintaining the attachment of ferroelectric particles to the active material, thus improving the battery's performance, especially at low temperatures.
Implementation Method 1
the ferroelectric particles promote the desolvation of solvated Li ions and reduce activation energy in an intercalation reaction of Li ions into the negative electrode active material particles
Data Source
AI summary
A method of manufacturing a negative electrode for a nonaqueous electrolyte secondary battery, the method includes mixing negative electrode active material particles and ferroelectric particles with each other to form first composite particles in which the ferroelectric particles are attached to the negative electrode active material particles; mixing the first composite particles and a binder with each other to form granulated particles; applying pressure to an aggregate of the granulated particles to form a sheet-shaped negative electrode mixture layer; and arranging the negative electrode mixture layer on a main surface of a negative electrode current collector foil.