Carbonaceous material, method for preparing same, and secondary battery and electric device comprising same

The invention provides a carbonaceous material and a preparation method thereof, and a secondary battery and an electric device containing the carbonaceous material, in a CO2 adsorption test, the total CO2 adsorption amount of the carbonaceous material at 0 DEG C under the relative pressure P/P0 of 10 <-8 >-0.029 is recorded as A, the adsorption time is recorded as B, the carbonaceous material meets the condition that A/B is greater than or equal to 1.7 cm < 3 >/(g * h) STP, the STP is a standard condition, P represents the test pressure of CO2, and B represents the test time of CO2. And P0 represents the saturated vapor pressure of CO2 at 0 DEG C. The carbonaceous material disclosed by the invention can give consideration to relatively high capacity and initial coulombic efficiency.