Microwave assisted synthesis and electrochemical behaviour of LiMg0.1Co0.9O2 for lithium rechargeable batteries

Successes and failures of Hubbard-corrected density functional theory: The case of Mg doped LiCoO2

“…For instance, the preferred site location of Mg changes with the U value. Mg is preferentially located on Co sites for calculations with GGA and GGA+U with U below 5.0 eV, which is in line with experiments 11,12,15,22,[25][26][27][28][29][30][31]81 showing that Mg is located at Co site. For calculations with U = 5.0 and 5.5 eV, however, Mg is equally stable on both Co and Li sites.…”

Microwave synthesis of novel high voltage (4.6V) high capacity LiCuxCo1−xO2±δ cathode material for lithium rechargeable cells

“…Cu dopant improves the cycling stability of LiCoO 2 material and further as reported by Yan et al [38] microwave synthesis controls the lithium loss (4%) compared to conventional calcination process (20-30%). Microwave synthesis of LiCu 0.2 Co 0.8 O 1.9 exhibits better cycling performance, less capacity fade compared to convetional synthesis of LiCu 0.05 Co 0.95 O 2 and other elemental doping cycled up to 4.5 V [5][6][7]11,16,[36][37][38][39][40][41]. Hence, microwave synthesis without calcination improves the cycling stability of the synthesized materials compared to the material synthesized by calcination assisted microwave process [5].…”

“…Microwave irradiation to transition metal oxides usually results in faster heating of the compounds so that the desired final product can be obtained within very short time [18]. Recently, we have reported the synthesis of Mg doped LiCoO 2 [5] material irradiated by 50% microwave power followed by calcination at 850 • C. It is observed that 50% microwave power is not enough to obtain the required final product. Hence, in this paper, we report the synthesis of divalent substituted Cu 2+ into the Co site in LiCoO 2 cathode material using microwave method only without further calcinations.…”

“…This structural instability results in restricted cycling performance. To reduce the influence of structural and stress effects on the electrochemical performance of LiCoO 2 , substitution of Co for other transition metals such as Al, Zr, Ti, and Mg has been investigated [5][6][7]. However, these attempts failed to enhance the capacity and also to increase the structural stability of LiCoO 2 during cycling when charged to higher voltages i.e., above 4.3 V. Metal powders especially Cu or Ag have been found to mainly increase the capacity of the layered cathode materials [8][9][10].…”

Synthesis and electrochemical performance of La-doped Li3V2−x La x (PO4)3 cathode materials for lithium batteries

“…Recently, many novel methods such as the sol-gel method (SG) [5], hydrothermal method (HT) [6], one-step method (OS) [7], rheological phase reaction method (RPR) [8], low temperature solid-state reaction method (LTSSR) [9], and microwave processing method (MWP) [10][11] have been explored to improve the electrochemical performance of Li 3 V 2 (PO 4 ) 3 cathode materials. Among these new methods the MWP method has some unique characteristics such as rapid and uniform heating, short reaction time, and low energy consumption compared with the conventional heating methods, and has been used in the synthesis of cathode materials of lithium ion batteries as an ideal heat source [12][13][14][15][16]. Rare earth elements have some outstanding features such as high electric charge, large radius and high self-polarization ability, and have been widely applied in the synthesis of cathode materials of lithium ion batteries, for instance, LiCo 1−x Re x O 2 , LiNi 1−x Re x O 2 , LiMn 2−x Re x O 4 , Li 2 V 2−x Re x O 5 , and LiFe 1−x Re x PO 4 (Re represents rare earths) [17].…”