Soft carbon and method for manufacturing the same

A method for making a soft carbon, comprising the steps of:

• a) providing a coke;
• and
• b) subjecting the coke to a carbonization process to obtain the soft carbon, the carbonization process sequentially including a preliminary calcination treatment, a main calcination treatment, and a surface-modifying calcination treatment,
• wherein
• the preliminary calcination treatment is conducted by calcining the coke at a first temperature within a range of 800° C. to 1000° C. to obtain a pre-calcinated coke;
• the main calcination treatment is conducted by calcining the pre-calcinated coke at a second temperature that is higher than the first temperature and within a range of 1000° C. to 1200° C. to obtain a main-calcinated coke;
• and
• the surface-modifying calcination treatment is conducted by calcining the main-calcinated coke in the presence of a pitch at a third temperature that is higher than the first temperature and within a range of 1000° C. to 1200° C. such that after the surface-modifying calcination treatment, the main-calcinated coke is coated with the pitch, thereby obtaining the soft carbon.