Polyurethane Electrode Coating for Lithium Battery Cycle Life
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Lithium secondary batteries face challenges in achieving improved cycle life and capacity density due to limitations in electrode materials and coatings.
Innovation Solution
A polyurethane-based coating layer is formed on the surface of the electrode using an isocyanate-based compound through a urethane bonding reaction with hydroxyl groups, enhancing the electrode's stability and interface properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional electrode structure is used, then the manufacturing process is simple, but the cycle life is insufficient
Solution Approach 1:
The patent applies preliminary action by pre-forming a polyurethane-based coating layer on the electrode surface before battery assembly. This coating layer is formed through a urethane bonding reaction between hydroxyl groups on the electrode active material surface and isocyanate compounds, creating a protective interface that stabilizes the electrode-electrolyte interaction from the outset, thereby improving cycle life without complicating the overall manufacturing process
Solution Approach 2:
The patent implements parameter changes by modifying the surface properties of the electrode through chemical treatment. Specifically, it changes the surface chemistry by introducing hydroxyl groups on metal oxide surfaces and subsequently forming polyurethane coatings, which alters the interface characteristics between the electrode and electrolyte, leading to improved stability and cycle performance
2Stability of the object's composition
If the electrode surface is left untreated, then the manufacturing process is simple, but the interface stability is poor
Solution Approach 1:
The patent applies self-service by utilizing the inherent hydroxyl groups present on the metal oxide surface of the electrode active material. These surface hydroxyl groups automatically react with the applied isocyanate compounds to form polyurethane bonds, eliminating the need for separate surface treatment steps or complex coating equipment. The electrode surface essentially serves itself by providing the reactive groups needed for coating formation
Solution Approach 2:
The patent uses an isocyanate compound as an intermediary substance that facilitates the formation of a stable interface between the electrode and electrolyte. The isocyanate reacts with hydroxyl groups on the electrode surface to create a polyurethane-based coating layer that acts as a mediator, improving interfacial stability and preventing direct contact between the electrolyte and electrode surface
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 polyurethane-based coating layer improves the cycle life of secondary batteries by maintaining the porous structure and stabilizing the electrode interface, leading to better retention of capacity over multiple charging and discharging cycles.
Implementation Method 1
the polyurethane-based coating layer may be formed by urethane bonding reaction of the hydroxyl group (—OH) at the surface of the electrode active material combination and an isocyanate compound
Data Source
AI summary
The present invention relates to an electrode for a secondary battery including an electrode current collector, an electrode active material combination layer formed on one or both sides of the electrode current collector, and a polyurethane-based coating layer formed on the electrode active material combination layer, and a lithium secondary battery including the same.