Synthesis and characterization of full concentration-gradient LiNi 0.7 Co 0.1 Mn 0.2 O 2 cathode material for lithium-ion batteries

Improved electrochemical performance of LiNi0.8Co0.1Mn0.1O2 cathode materials via incorporation of rubidium cations into the original Li sites

“…The small semicircles in the high frequency can be assigned to the resistance of Li + diffusion in the surface layer (including the SEI lm and the surface modied layer). 32 Such impedance spectra can be explained by an equivalent circuit model as shown in the inset of Fig. 8(a), including a solution resistance (R s ), a chargetransfer resistance (R ct ), a constant phase element (CPE) and Warburg impedance (Z w ).…”

Structural, morphological and electrochemical investigation of LiNi0.6Co0.2Mn0.2O2 cathode material synthesized in different sintering conditions

“…Primary steps of NCM622 synthesis involved ball-milling, two-step sintering, after which the product was grinded and sieved, and then active material was used as working electrode and assembled with other ancillaries for button battery test. The mixture of Li 2 CO 3 and Ni 0.6 Co 0.2 Mn 0.2 (OH) 2 was pretreated under 650 o C for 6 h followed by calcined at 750~850 o C (samples denoted as NCM622-750, -780, -800, -850) for 10~18 h (denoted as NCM622-10h, -12h, -14h, -16h, -18h) under flowing oxygen to suppress the generation of lattice defect [21].…”

Progress in Preparation and Modification of LiNi0.6Mn0.2Co0.2O2 Cathode Material for High Energy Density Li-Ion Batteries

“…When the Co content in Ni 0.6 Mn 0.4−x Co x (OH) 2 increased, the tap-density and the initial discharge capacity of NCM622 increased, but their cycling stability decreased owing to the acceleration of grain growth [17]. The NCM622 cathode materials with the concentration gradient of Mn and Ni elements were synthesized using hydroxide coprecipitation method [18]. As seen in Figure 2, the electrochemical properties of concentration-gradient cathode materials were better than those of the homogeneous cathode material.…”