Abstract
Surface modification of graphite anode with electroactive matters has been proven of a more practical strategy in enhancing the performance of Li-ion batteries than exploring alternative novel anode materials.Herein,rutile TiNbO4-x nanoparticles with a tunnel structure are employed as multifunctional decoration substances in combination with a carbon coating layer to improve the rate and cycle properties of mesocarbon microbeads(MCMBs).As compared to pristine MCMB,the Li+diffusion coefficients of the composite anodes are enhanced due to the synergistic effect of TiNbO4-x@C.Meanwhile,the overcharge and voltage polarization of the composite anodes at high rate are obviously minimized due to the current sharing effect of the high-potential TiN-bO4-x.Moreover,the amorphous LiyTiNbO4-x converted from TiNbO4-x in the initial lithiation process can deliver pseudocapacitive capacity to the composite anodes from the second cycle.All of these functions of TiNbO4-x@C coating layer have directly contributed to the improved rate and cycle performance of the MCMB/TiNbO4-x@C composite anodes.The one containing 12.0 wt％TiNbO4-x exhibits a high reversible specific capacity of 118 mAh·g-1 at 10C(1C=372 mA·g-1),together with a high capacity retention of 90.9％after 300 cycles at 3C,which are all much superior to those of pristine MCMB.
基金项目
Natural Science Foundation Project of Fujian Province(2020J01287)
Natural Science Foundation Project of Fujian Province(2020H0024)
NETL
NSTL
万方数据