Hydrothermal Synthesis of Li2MnO3-Stabilized LiMnO2 as a Cathode Material for Li-Ion Battery

Abstract

Herein, we reported the composite structure of LiMnO2 and Li2MnO3 as a low-cost and environmentally benign cathode material. This composite with the main phase of LiMnO2 (90%) was synthesized by hydrothermal method at 220°C from LiOH and Mn(CH3COO)2 precursors. The obtained nanosized LiMnO2-LiMnO3 cathode material exhibits a high capacity of 265 mAh g-1 at C/10. The incorporation of Li2MnO3 into the LiMnO2 phase could stabilize the structure, leading to the improved cycle stability of the cathode. The capacity retention of the cathode was 93% after 80 cycles at C/2. Our results facilitate a potential strategy for developing high-performance cathode materials based on the Li-Mn-O system.

Unexplored Orthorhombic LiMn1–xTixO2 Cathode Materials with a Stable Atomic Site Occupancy and Phase Transition

“…This finding indicates that o -LiMn 1– x Ti x O 2 ( x = 0) is composed of o -LiMnO 2 and m -Li 2 MnO 3 as the primary and secondary phases, respectively. Because the o -LiMnO 2 phase is metastable, Li ions can diffuse into the Mn octahedral sites of o -LiMnO 2 at high temperatures, which spontaneously forms a small amount of the m -Li 2 MnO 3 phase. , In the cases of o -LiMn 1– x Ti x O 2 ( x = 0.05, 0.1), c -LiTiO 2 was identified as a secondary phase, not m -Li 2 MnO 3 and m -Li 2 TiO 3 . Particularly, it is worth noting that the main characteristic peaks of m -Li 2 TiO 3 were not observed in the XRD patterns of o -LiMn 1– x Ti x O 2 ( x = 0.05, 0.1).…”

“…This finding indicates that o-LiMn 1−x Ti x O 2 (x = 0) is composed of o-LiMnO 2 and m-Li 2 MnO 3 as the primary and secondary phases, respectively. Because the o-LiMnO 2 phase is metastable, Li ions can diffuse into the Mn octahedral sites of o-LiMnO 2 at high temperatures, which spontaneously forms a small amount of the m-Li 2 MnO 3 phase 40,43.…”

Low-Pressure Argon/Hydrogen/Oxygen Plasma Treatment on LiMn2O4 Li-Ion Hybrid Supercapacitors

“…51,52 Figure S4 shows the Mn2p spectra; these can be divided into two peaks, namely, Mn2p 1/2 and Mn2p 3/2 that correspond to 653.58 and 641.88 eV, respectively, with a spin-orbital splitting value of approximately 11.7 eV. 53,54 The binding energy of indicating the coexistence of both Mn 3+ and Mn 4+ . Figures S4e-S4h show that the binding energy of Mn2p 3/2 increases after the CV test, indicating that the electron valence number of Mn increases.…”

Application of mining technology by the combination of ANSH equipment to longwall in Seam 6 of Mao Khe coal mine, Viet Nam

“…Fully mechanized mining technology is a type of technology that uses shearer or plow with mechanized shield to extract coal seams [1][2][3]. This technology has been used in many countries, especially in China and European countries [4], where mechanized mining techniques applied to coal seams are also relatively effective.…”