1. Types of energy density

① Mass energy density: refers to the energy stored per unit mass of the battery, the unit is Wh/kg

② Volume energy density: refers to the energy stored per unit volume of the battery, the unit is Wh/L

2. Factors affecting energy density

① Battery materials: The properties of materials such as positive electrode, negative electrode and electrolyte directly affect the battery energy density.

② Battery structure: The electrode structure, electrolyte structure, and battery packaging and integration technology will affect the energy density.

③ Battery preparation process: The electrode preparation process, electrolyte preparation process, and battery assembly and packaging process also have an impact on the energy density.

3. Methods to improve energy density

① Improvement of electrolyte and diaphragm: optimize electrolyte performance and improve ion transmission efficiency.

② Battery structure design: adopt flattened, thin-sheet design, or multi-electrode structure design, etc.

③ Manufacturing process optimization: reduce active material loss and improve battery capacity and energy efficiency by improving manufacturing process.

4.Energy density type selection

Which energy density to choose depends on the needs of the specific application scenario. If long battery life and light weight are required, then a battery with higher mass energy density will be a better choice. On the contrary, if you need to obtain maximum energy storage in a limited space, a battery with higher volume energy density will be more suitable.