Battery Electrode Coating and Binder for Uniform Peel Strength
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Solution Overview
Problem
Existing electrodes in electrochemical devices face challenges in achieving both high peel strength and uniformity of peel strength between the electrode layer and the current collector, which affects the performance and consistency of electrochemical devices.
Innovation Solution
Incorporating a current collector with a coating layer containing conductive carbon and a first binder, and an electrode layer with a second binder comprising a styrenic elastomer with specific nitrogen content and styrene mole fraction, enhancing the interaction between the electrode layer and the current collector.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a coating layer with conductive carbon and binder is used on the current collector, then the adhesion between current collector and electrode layer is improved, but the uniformity of peel strength across the electrode surface may be compromised
Solution Approach 1:
The invention changes the chemical composition parameters of the binder, specifically incorporating a styrenic elastomer with controlled nitrogen content (120-400 mass ppm) and styrene mole fraction (0.12 or more). This parameter optimization enables the binder to achieve both strong adhesion to the current collector and uniform distribution across the electrode layer, resolving the contradiction between high peel strength and uniformity of peel strength
Solution Approach 2:
The invention uses a composite binder system comprising a styrenic elastomer combined with conductive carbon in the coating layer. This composite material structure provides both the adhesive functionality (from the elastomer) and the electrical conductivity (from the carbon), while the specific composition ratios ensure uniform performance across the entire electrode surface, simultaneously achieving high peel strength and its uniformity
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 configuration improves both peel strength and its uniformity, leading to enhanced cycle characteristics and consistent performance of electrochemical devices, particularly in all-solid-state secondary batteries.
Implementation Method 1
The adhesion between the current collector and the electrode layer affects the performance of electrochemical devices. A current collector that includes a substrate and a coating layer is known as a current collector capable of enhancing adhesion.
Data Source
AI summary
An electrode plate according to the present disclosure includes: a current collector, the current collector including a substrate and a coating layer coating the substrate; and an electrode layer disposed on the current collector, wherein the coating layer includes conductive carbon and a first binder, the electrode layer includes a second binder, and the second binder includes a styrenic elastomer in which a mole fraction of a repeating unit derived from styrene is 0.12 or more and a total nitrogen content is 120 mass ppm or more and 400 mass ppm or less.