Simply Constructing Li_(1.2)Mn_(0.6)Ni_(0.2)O2/C Composites for Superior Electrochemical Performance and Thermal Stability in Li–Ion Battery

摘要

Co-free Li-rich cathode material Li_(1.2)Mn_(0.6)Ni_(0.2)O2 has been successfully modified by conductive acetylene black (CAB) using a simple physical grinding and post annealing process.Xray photoelectron spectroscopy (XPS),X-ray absorption nearedge structure (XANES) and Fourier transform infrared spectra (FTIR) characterizations show that annealing process leads to the formation of a strong chemical interaction between CAB and Li_(1.2)Mn_(0.6)Ni_(0.2)O2.The modified sample with 5wt% CAB exhibits excellent cycle stability (83.9% capacity retention after 100 cycles at 1 C) and remarkable rate capacity (93.0 mAhg~(-1) at 10 C).At the same time,the thermal stability of pristine is obviously enhanced by modification with CAB.Such improvement is ascribed to the existence of the strong interaction between Li-rich oxide and CAB.This work will offer hints for promoting the commercialization of Li-rich cathodes.