Battery Separator Coating Structure for Adhesion Without Added Thickness
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Solution Overview
Problem
Secondary batteries face challenges in achieving better safety and electrochemical performance, which are crucial for their widespread adoption in consumer electronics and electric vehicles.
Innovation Solution
A separator with a coating layer comprising organic and inorganic particles, where the organic particles are embedded into the inorganic particle layer to form bulges, enhancing adhesion and ion transmission while reducing heat transfer and ion channels, thereby improving cycling and safety performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separator has two coating layers (inorganic particle layer and organic particle layer), then adhesion and contact between separator and electrode plates are improved, but overall thickness of the separator increases
Solution Approach 1:
The patent combines the inorganic particle layer and organic particle layer into a single integrated coating layer. The organic particles are embedded within the inorganic particles, creating a unified structure that provides both adhesion benefits and thickness reduction compared to separate layers.
Solution Approach 2:
The coating layer uses a composite structure where organic particles (for adhesion) and inorganic particles (for structural support) are combined in a single layer. This composite approach allows the separator to achieve both good contact with electrode plates and reduced overall thickness.
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 separator design enhances energy density, cycling performance, and safety by reducing the overall thickness, improving adhesion, and forming a glue film structure that delays heat transfer and reduces ion transmission channels, especially at high temperatures.
Implementation Method 1
The organic particles and the inorganic particles form a special coating layer structure, which can ensure superior adhesion and contact between the separator and electrode plates
Implementation Method 2
during operation at high temperatures, the coating layer structure of the separator can form a glue film structure, which can effectively reduce ion transmission channels and delay heat transfer
Implementation Method 3
the inorganic particles and the first-type organic particles are included in the same coating layer... can ensure superior adhesion and contact between the separator and electrode plates, thereby improving the cycling performance of the battery
Data Source
AI summary
This application relates to a separator, including a substrate and a coating layer provided on at least one surface of the substrate. The coating layer includes organic particles and inorganic particles, the organic particles include first-type organic particles, the inorganic particles form an inorganic particle layer, and the first-type organic particles are embedded into the inorganic particle layer and form bulges on a surface of the inorganic particle layer. A number-based median particle size of the first-type organic particles is ≥12 μm, and a ratio of an average height of the bulges to a thickness of the inorganic particle layer is ≥4. This application further relates to a separator preparation method, a secondary battery containing such separator, and a related battery module, battery pack, and apparatus.