Improved electrochemical activity of the Li2MnO3-like superstructure in high-nickel Li-rich layered oxide Li1.2Ni0.4Mn0.4O2 and its enhanced performances via tungsten doping

In Situ Reconstruction of the Spinel Interface on a Li-Rich Layered Cathode Material with Enhanced Electrochemical Performances through HEPES and Heat Treatment Strategy

“…When the electrode continued to be charged to 4.8 V, the Li 2 MnO 3 component begins to be activated. , Different from the pristine LLO electrode (Figure a), the (003) peak of 10%HEPES-LLO-H 2 shifts to a lower angle, indicating the lattice expansion after Li + ion removal. It is attributed to the increased repulsion between the adjacent oxygen layers and the enhanced ability of Li ions to be extracted from the Li layer . In the first discharge process, the (003) peak shifts to a high angle, which is related to the decrease of electrostatic repulsion between the oxygen layers caused by the insertion of Li + ions into the Li + layer.…”

“…It is attributed to the increased repulsion between the adjacent oxygen layers and the enhanced ability of Li ions to be extracted from the Li layer. 67 In the first discharge process, the (003) peak shifts to a high angle, which is related to the decrease of electrostatic repulsion between the oxygen layers caused by the insertion of Li + ions into the Li + layer. The white dotted frame in Figure 10b shows an approximately symmetrical peak position change, which is caused by the in situ induced spinel phase on the surface of 10%HEPES-LLO-H 2 .…”

Lithium Antievaporation-Loss Engineering via Sodium/Potassium Doping Enables Superior Electrochemical Performance of High-Nickel Li-Rich Layered Oxide Cathodes

“…However, little is reported about the effective ways of escalating the capacity of HNLO. In fact, the lithium deficiency in HNLO, which is normally unfavorable for capacity escalation, and the increased difficulty to prepare stoichiometric-lithium HNLO with the increased nickel content have already been pointed out. , Guo et al , reported the enhancement of the capacity of HNLO by doping Mo to reduce oxygen loss and activate Mn 4+/3+ redox couples and by doping tungsten to activate the Li 2 MnO 3 -like superstructures, respectively. However, the doping of both Mo and W above failed to address the issue of lithium deficiency and could not improve the low-rate cycling performance.…”

Highly Reversible Li‐Ion Full Batteries: Coupling Li‐Rich Li1.20Ni0.28Mn0.52O2 Microcube Cathodes with Carbon‐Decorated MnO Microcube Anodes

“…In the case of the cathode materials, layered LiCoO 2 , LiNi 0.33 Co 0.33 Mn 0.33 O 2 , olivine LiFePO 4 , spinel LiMn 2 O 4 were used widely in the commercialized LIB cathodes [9–12] . However, these cathode materials are insufficient to satisfy the required performances for electric vehicles since the charge/discharge capacity about 120–200 mAh g −1 was achieved [13–17] . Therefore, it is important to develop alternative cathodes having high energy‐ and power‐density.…”

“…[9][10][11][12] However, these cathode materials are insufficient to satisfy the required performances for electric vehicles since the charge/discharge capacity about 120-200 mAh g À 1 was achieved. [13][14][15][16][17] Therefore, it is important to develop alternative cathodes having high energy-and power-density. Recently, Li-rich materials with the chemical formula of xLi 2 MnO 3 • (1-x)LiMO 2 (M = Ni, Mn, Co, etc.)…”