Patent ID: 8894964

Claim:
An energy storage device, comprising: a crystalline carbon material comprising a crystal structure including a plurality of atom layers with a controlled interlayer spacing between two adjacent atom layers formed in a crystal plane (002), the controlled interlayer spacing represented by peaks of the crystal plane (002), measured by a X-ray diffraction using CuKα ray, at scattering angles of the CuKα ray 23°±5.0° and 26.5°±1.0°, with the peak height at the scattering angle of the CuKα ray 23°±5.0° being higher than the one at the scattering angle 26.5°±1.0°, and the crystalline carbon material has a specific surface area ranging from 21.8 m 2 /g to 58.4 m 2 /g; the crystalline carbon material has surface pH ranging from 5 to 8.