Ionically Insulating Coating for Electrode Binder Stability
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Solution Overview
Problem
Electrode binders in energy storage devices degrade at elevated voltages and temperatures, leading to reduced performance, capacity loss, and potential cell failure due to electrochemical reactions with lithium ions.
Innovation Solution
Coating binder particles with an ionically insulating material to prevent ionic contact with electrolytes, thereby reducing degradation and enhancing stability, using methods such as fibrillization and milling to form self-supporting electrode films with conductive carbon coatings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If electrode binders are used at higher operating voltages and temperatures, then energy storage capacity and power capability are enhanced, but binder degradation occurs leading to reduced performance and cell failure
Solution Approach 1:
An ionically insulating coating layer is applied as an intermediary between the binder particle and the electrolyte. This coating prevents direct ionic contact while allowing the binder to maintain its binding function, thereby protecting the binder from electrochemical degradation at elevated voltages and temperatures without compromising device performance
Solution Approach 2:
The binder particle is transformed into a composite structure with a core binder material and an outer ionically insulating coating layer. This composite structure combines the binding functionality of the core material with the protective properties of the coating, enabling stable operation under harsh conditions
2Reliability
If binder particles are coated with ionically insulating material, then ionic contact with electrolyte is reduced and stability is improved, but device complexity increases
Solution Approach 1:
The coating process utilizes control of physical parameters such as particle size distribution, coating thickness, and material composition to achieve effective protection. By optimizing these parameters, the coating can be applied efficiently without requiring overly complex processing equipment or multiple sequential steps
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
The coated binder particles improve the stability and performance of energy storage devices by reducing equivalent series resistance, maintaining capacitance, and extending the life of the device under high voltage and temperature conditions.
Implementation Method 1
the coating provides ionic insulation to the binder particle
Implementation Method 2
the coating material is an electrical conductor
Data Source
AI summary
Passivation methods and compositions for electrode binders are disclosed. A coated binder particle for use in an electrode film of an energy storage device is provided. The coated binder particle can comprise a coating over the surface of a binder particle, wherein the coating provides ionic insulation to the binder particle. In some embodiments, the coating covers the entire surface of the binder particle. In still further embodiments, a coated binder particle in an energy storage device blocks ionic contact between the binder and an electrolyte.