Abstract: The present application provides a hard carbon, a method for preparing the same, a secondary battery comprising the same, and an electrical apparatus comprising the same, where an amount of generated CO2 is detected in thermal programmed desorption-mass spectrum (TPD-MS) to be less than or equal to 1.0 mmoL/g and an amount of generated CO is detected in thermal programmed desorption-mass spectrum to be less than or equal to 2.0 mmoL/g, when the hard carbon is heated from 50° C. to 1,050° C. The present application can improve both the capacity and the first coulomb efficiency of the hard carbon.

Abstract: A carbon material includes a porous carbon substrate and an amorphous carbon layer provided on at least part of a surface of the porous carbon substrate.

Abstract: A hard carbon. A total quantity of adsorbed nitrogen under a relative pressure P/P0 of nitrogen between 10?8 and 0.035 is V1 cm3 (STP)/g and a total quantity of adsorbed nitrogen under a relative pressure P/Po of nitrogen between 0.035 and 1 is V2 cm3 (STP)/g in a nitrogen adsorption isotherm determined at a temperature of 77 K for the hard carbon. The hard carbon satisfies: V2/V1?0.20 and 20?V1?150, where P represents an actual pressure of nitrogen, and P0 represents a saturated vapor pressure of nitrogen at a temperature of 77 K.