Lithium-ion Full Cell Manufacturing Process Training--Separator section
1.Role and Selection Criteria of Separators
1.1.Role of Separator
1) The separator is an important component of lithium-ion batteries.
2) Electronic insulation and ionic conductivity.
1.2.Requirement of Separator
Characteristics of separators
1)Electronic insulation - mechanical isolation between the positive and negative electrodes;
2)Certain pore sizes and porosity, low resistance and high ionic conductivity, allowing good permeability for lithium ions;
3)Resistant to corrosion by electrolytes, with sufficient chemical and electrochemical stability;
4)Good wettability to electrolytes and sufficient ability to absorb and retain moisture;
5)Sufficient mechanical properties - such as puncture strength and tensile strength, while maintaining as thin a thickness as possible;
6)Good spatial stability and flatness;
7)Excellent thermal stability and automatic shutdown performance;
8)Higher requirements for separators in power batteries, typically using composite membranes.
1.3.Main Performance Parameters of Separators