Energy storage methods

1. Electrical / Electro magnetical

1.1. Capacitors

1.2. Superconducting magnetic storage

2. Chemical

2.1. Electro chemical

2.1.1. Lead-acid batteries

2.1.2. Batteries based on nickel

2.1.3. Li-Io batteries

2.1.4. High-temperature batteries

2.1.5. Redox-Flow batteries

2.1.6. Hybrid-Flow batteries

2.1.7. Metal-air batteries

2.1.8. Hydrogen

2.2. Fuels

2.3. Thermo-chemical

2.3.1. Storage based on sorption

2.3.2. Storage based on reversible chemical bond

3. Thermal

3.1. Latent heat storage systems

3.2. Sensible heat storage systems

3.2.1. Short term storage

3.2.1.1. Hot water

3.2.1.2. Steam

3.2.1.3. Fluids & solids

3.2.2. Long term storage

3.2.2.1. Hot water

3.2.2.2. Gravel - water

3.2.2.3. Borehole - storage

3.2.2.4. Aquifer

3.2.2.5. Hybrid - storage

4. Mechanical

4.1. Compressed-air storage (CAES)

4.2. Pumped hyrdo-electric storage

4.3. Flywheel energy storage systems (FESS)