Abstract:

To avoid the performance fading and safety problem of lithium batteries caused by dendrite growth on the surface of lithium anode, the mesoporous carbon matrix (MCM) was prepared using the zeolitic imidazolate framework-8 (ZIF-8) as the template and precursor. X-ray powder diffraction (XRD) and Raman spectroscopy indicate that the MCM has a certain degree of graphitization, and the N₂ adsorption-desorption test (BET) proves that MCM has typical mesoporous characteristics. The XRD, Raman and BET test results suggest that the optimum annealing temperature is 900 ℃. The optimized MCM is used to study the surface modification of lithium anode. After the charge and discharge cycle test, the XRD and scanning electron microscopy (SEM) tests show that the orientation deposition of lithium metal is avoided and the growth of lithium dendrites is suppressed because MCM can balance the charge distribution on the lithium anode surface. This work reveals a facile but efficient synthesis approach of the surface modification agent to extend the cycle life and enhance the safety for high performance lithium batteries.

Key words: lithium battery, lithium dendrite, surface modification agent, mesoporous carbon matrix, suppressing dendrite growth