In order to improve the electrochemical performance and decrease the volume changes of artificial graphite, Li 2 SiO 3 and Li 2 CO 3 have been in situ prepared to co-modify the graphite by ball milling and heating the precursors of Li 4 SiO 4 and graphite. The as-obtained graphite-based samples were characterized using various techniques, and the effects of Li 4 SiO 4 content were investigated. The results show that the co-modified graphite with 20 wt.% Li 4 SiO 4 exhibits the highest reversible capacity and the best cycling performance among the graphite-based samples. Compared to the pristine graphite, the initial reversible capacities of the co-modified graphite with 20 wt.% Li 4 SiO 4 respectively increase 10.1%, 16.4%, 28.9%, and 62.4% at the current rates of 0.1, 1.0, 2.0 and 5.0 C, while the capacity fade ratios respectively decrease 3.8%, 10.0%, and 23.2% at the current rates of 1.0, 2.0 and 5.0 C after 50 cycles. Furthermore, co-modification by Li 2 SiO 3 and Li 2 CO 3 decreases the polarization degree as well as the charge transfer reaction and diffusion resistances of pure graphite. Non-destructive stress-strain tests were adopted to real time monitor the macroscopic stress safety properties of the cells, and the results indicate that the combination of Li 2 SiO 3 and Li 2 CO 3 relieves the swelling of the graphite electrode during cycles, and the stress value of the cell surface decreases 34.4% after 50 cycles at the current rate of 1.0 C. The relationship between residue stress and capacity fade along with possible reaction mechanisms is discussed. The good results pave a novel facile way to enhance the performance of current energy materials using combined lithium salts via in situ reaction.