I. Improving Lithium-ion Battery Safety
The main function of the lithium-ion battery separator is to isolate the positive and negative electrodes while allowing lithium ions to pass through. When the battery operates under high temperature or overcharge conditions, ordinary separators may experience thermal shrinkage, while the alumina powder coating has the characteristics of high temperature resistance and good thermal stability, forming a stable ceramic protective layer.
The functions of the alumina coating:
· Prevents separator thermal shrinkage
· Prevents direct contact between the positive and negative electrodes
· Reduces the risk of battery short circuits
· Improves battery thermal safety performance
In short: The alumina coating is equivalent to adding a high-temperature resistant protective layer to the separator.
II. Improving the High-Temperature Resistance of the Separator
Ordinary PE separators have a melting point of approximately 130℃, PP separators approximately 160℃, while alumina can withstand temperatures exceeding 1000℃. After coating with alumina, the separator maintains structural stability even at high temperatures.
Comparison of separator before and after coating:
Performance: Standard separator vs. Alumina-coated separator
Heat shrinkage: Relatively large vs. Very small
High temperature resistance: Average vs. Very high
Safety: Average vs. High
Cycle life: Medium vs. Long
Battery stability: Average vs. More stable
Therefore, most power batteries, energy storage batteries, and high-end 3C batteries currently use ceramic-coated separators.
III. Improving Battery Cycle Life
Alumina powder possesses the following characteristics:
· High chemical stability
· Does not participate in battery reactions
· Strong surface adsorption capacity for electrolyte
· Improved separator wettability
This brings several benefits:
1. Increased electrolyte adsorption
2. More stable lithium-ion transport
3. Lower internal resistance
4. Longer cycle life
5. Higher battery capacity retention
Therefore, many battery manufacturers use high-purity, ultrafine alumina powder as the ceramic coating material for separators.
IV. Improving Separator Surface and Coating Performance
Alumina powder used for lithium battery separator coating typically possesses the following characteristics:
· Small particle size and narrow distribution
· High purity
· Large specific surface area
· Good dispersibility
· Uniform coating
· Strong adhesion
This ensures:
· No coating cracking
· No powder shedding
· Uniform coating thickness
· Stable separator permeability
· Better battery performance consistency
Zibo Xiangrun Environmental Engineering Co., Ltd. has extensive production experience in the field of alumina materials. For lithium battery separator ceramic coating applications, they have developed specialized alumina powder products with stable physical properties and excellent coating effects.
Our alumina powder for lithium battery separators offers the following advantages: High purity and low impurity content, improving battery stability and safety; concentrated particle size distribution, resulting in a uniform coating and reducing coating defects; good powder dispersibility and strong compatibility with binder systems, suitable for ceramic coating processes; moderate specific surface area, beneficial for electrolyte adsorption and ion conduction; and high batch stability, meeting the large-scale continuous production needs of lithium battery separator manufacturers.
Zibo Xiangrun can provide alumina powder products with different particle size ranges and performance indicators according to different separator coating processes and customer requirements, providing lithium battery separator manufacturers with stable and reliable raw material solutions.
If you have any questions or needs regarding alumina powder for lithium battery separators, please contact Zibo Xiangrun Environmental Engineering Co., Ltd. – a professional alumina manufacturer.
