ABSTRACTIncreasing the operation voltage of LiCoO2 (LCO) is a direct way to enhance the energy density of the Li-ion batteries. However, at high voltages, the cycling stability degrades very fast due to the irreversible changes in the electrode structure, and formation of an unstable solid electrolyte interface layer. In this work, Ag thin film was prepared on commercial LCO cathode by using magnetron sputtering technique. Ag coated electrode enabled an improved electrochemical performance with a better cycling capability. After 100 cycles, Ag coated LCO delivers a discharge capacity of 106.3 mAh g-1 within 3 - 4.5 V at C/5, which is increased by 45 % compared to that of the uncoated LCO. Coating the electrode surface with Ag thin film also delivered an improved Coulombic efficiency, which is believed to be an indication of suppressed parasitic reactions at the electrode interface. This work may lead to new methods on surface modifications of LCO and other cathode materials to achieve high-capacity Li-ion batteries for high-voltage operations.
We presented a computational screening protocol for the efficient development of cathode-electrolyte interphase (CEI)-forming additive materialsviathe first-principles calculations.
Correction for ‘The role of thermal annealing on the microstructures of (Ti, Fe)-alloyed Si thin-film anodes for high-performance Li-ion batteries’ by Minsub Oh et al., RSC Adv., 2018, 8, 9168–9174.
The development of highly oxidation resistant current collectors that are inert against lithium at elevated temperatures and high potentials is essential for the realization of high performance thin film solid state lithium based batteries.
Computational screening of phosphite derivatives as high-performance additives in high-voltage Li-ion batteries