Carbon decorated Li3V2(PO4)3 for high-rate lithium-ion batteries: Electrochemical performance and charge compensation mechanism

Exploring the Charge Compensation Mechanism of P2-Type Na0.6Mg0.3Mn0.7O2 Cathode Materials for Advanced Sodium-Ion Batteries

“…In general, there are mainly two features located at 638-643 eV and 649-657 eV, which are assigned to the L3 (Mn 2p3/2 to Mn 3d transition) and L2 edges (Mn 2p1/2 to Mn 3d transition), respectively. Note that the 2p1/2 core hole has a shorter lifetime, leading to a broad feature for L2 edges [34], and therefore, we will mainly focus on the Mn L3-edge features in the following discussions. To further investigate the charge compensation mechanism of P2-type NaMMO upon sodiation/desodiation, we used soft X-ray absorption spectroscopy (sXAS) for NaMMO electrodes at different states of charge (SOCs) using the surface-sensitive total electron yield (TEY) mode and bulk-sensitive total fluorescence yield (TFY) mode.…”

“…In general, there are mainly two features located at 638-643 eV and 649-657 eV, which are assigned to the L 3 (Mn 2p 3/2 to Mn 3d transition) and L 2 edges (Mn 2p 1/2 to Mn 3d transition), respectively. Note that the 2p 1/2 core hole has a shorter lifetime, leading to a broad feature for L 2 edges [34], and therefore, we will mainly focus on the Mn L 3 -edge features in the following discussions. For the spectrum of pristine electrode, it exhibits an obvious Mn 4+ feature with two well-defined peaks at 640.3 and 642.8 eV, suggesting that the pristine electrode mainly contains Mn 4+ as expected.…”

Covalent organic framework with active C=O/C=N groups for high performance cathode material for lithium‐ion batteries

“…1 However, in the developed electrode materials of LIBs, the mismatching in capacities between the cathode and anode hindered the maximization in the battery performances and design of full cells. [2][3][4] Currently, the capacity limitation of cathode materials was the main obstacle, since the developed/commercial cathode materials exhibited low theoretical capacities and even lower practical capacities, including LiCoO 2 (theoretical value of 274 mAh g À1 ), 5 LiMnO 2 (285 mAh g À1 ), 6 LiFePO 4 (170 mAh g À1 ) 7 and ternary cathode material NCM (278 mAh g À1 ) 8 and recently developed phosphate electrode materials such as Li 3 V 2 (PO 4 ) 3 , 106 mAh g À1 after 1000 cycles at 20C 9 and amorphous FePO 4 nanoparticle, 79 mAh g À1 after 1000 cycles at 20C. 10 While the developed anode materials such as silicon (4200 mAh g À1 ), 11 graphite (372 mAh g À1 ), 12 SnO (880 mAh g À1 ), SnO 2 (780 mAh g À1 ), 13 Fe 2 O 3 (1005 mAh g À1 ), and Fe 3 O 4 (924 mAh g À1 ) 14 and so on, exhibited excessively high capacities than that of cathode materials.…”

Ionic Liquid-Mediated Mass Transport Channels for Ultrahigh Rate Lithium-Ion Batteries

“…The urgent demand of the intelligent dispersed energy storage system and electric vehicle market for a high-power lithium-ion battery (LIB) system has become a huge challenge. − In general, the rate performance of the LIBs is closely related to the ion mass transport. − Traditional bulk electrode materials with sluggish kinetics of Li-ion transport have gradually lost the ability to meet the needs of the power market. Given a large electrochemically active area and ideal active sites for faradic reactions, nanomaterials are considered as potential candidates for fast mass transport. − However, downsizing the particle size to nano always fails to improve the rate performance because of the aggregation of nanoparticles, which is detrimental to mass transport. , …”