We put the table below together to shed a little light on coating materials used on Chinese lithium battery separators and where the market is heading.

Alumina

• Improve thermal performance
• Increased puncture resistance
• High porosity is conducive to enhancing electrolyte 
• Improve battery efficiency, rate, cycle performance and extend battery life
• High Purity Alumina (HPA)

Boehmite – use increased 

• Low hardness, less machine wear
• Low specific gravity
• Coats 25% more area than Al2O3
• Better particle size distribution
• Low water absorption coefficient
• Low energy intensity
• Environmentally friendly;
• Low production cost

2020 demand

Alumina: 9,000 tons

Boehmite 8,700 tons

Research shows in 2019, boehmite accounted for 44%, an increase of 30% over 2016, and it is expected that in 2025 demand will reach 75%