Electrode-Separator Composite Structure for Heat and Peeling Control
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Solution Overview
Problem
Rechargeable lithium batteries face issues with heat generation and separator peeling, which affect their stability and durability, particularly in high-energy density applications.
Innovation Solution
An electrode-separator structure is developed with a separator composite layer comprising polymer fibers and inorganic particles, formed through electrospinning and electrospraying, to enhance adhesion and control heat generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If high energy density active materials are used in rechargeable lithium batteries, then energy density is improved, but heat generation increases causing separator peeling
Solution Approach 1:
The patent applies local quality by creating different regions on the current collector: an uncoated region at the end where heat can be dissipated without active material, and a coated region with active material for energy storage. This spatial differentiation allows the battery to achieve high energy density in the coated region while managing heat generation through the uncoated region, preventing separator peeling caused by excessive heat.
Solution Approach 2:
The patent uses composite materials by combining the current collector with both coated and uncoated regions, creating a heterogeneous structure that integrates energy storage functionality with heat management capabilities. The composite structure allows simultaneous achievement of high energy density and effective heat dissipation, resolving the contradiction between energy density improvement and heat generation control.
2Reliability
If separator adhesion is strengthened to prevent peeling, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-forming the uncoated region on the current collector before battery assembly. This pre-prepared heat dissipation pathway is integrated into the electrode structure, allowing the separator to maintain stable adhesion without requiring additional complex adhesion-promoting layers or modifications. The uncoated region proactively manages heat before it can cause separator peeling, simplifying the overall structure while improving reliability.
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 structure provides excellent durability and prevents separator peeling, enabling the implementation of thin film rechargeable lithium batteries with controlled heat generation.
Implementation Method 1
injecting a polymer composition into a supply device of a nozzle section ejected onto the electrode active material layer, and injecting an inorganic particle composition into another supply device of a nozzle section ejected onto the uncoated region; and concurrently performing electrospinning by utilizing an electrospinning device, so that the polymer composition is electrospun on the electrode active material layer to form or provide a fiber region including a polymer fiber
Implementation Method 2
injecting an inorganic particle composition into another supply device of a nozzle section ejected onto the uncoated region; and concurrently performing electrospinning by utilizing an electrospinning device, so that the polymer composition is electrospun on the electrode active material layer to form or provide a fiber region including a polymer fiber, and the inorganic particles are electrosprayed on the uncoated region to form or provide an inorganic coating region
Data Source
AI summary
An electrode-separator structure is disclosed. The electrode-separator structure may include an electrode including a current collector; an electrode active material layer on the current collector; and an uncoated region at an end (e.g., at least one end) of the current collector where the electrode active material layer is not coated on the current collector; and a separator composite layer on a surface of the electrode, wherein the separator composite layer may include a fiber region including a polymer fiber and provided on the electrode active material layer; and an inorganic coating region including inorganic particles and provided on the uncoated region. The electrode may have excellent or suitable durability, and the separator on the current collector may not be easily peeled off and may achieve or provide the effect of controlling heat generation, thereby enabling the implementation of a thin film rechargeable lithium battery.