Synthesis of olivine NaMnPO4 single crystals and electrochemical performance as anode material for Li-ion batteries

Anion Substitution to Suppress the Voltage Hysteresis of Na3MnTi(PO4)3 as a Cathode Material for Sodium-Ion Batteries

“…This suggests that the mixed valence state is generated during the citric acid-assisted sol–gel reaction. As can be seen from Figure d, the multiplet splitting of the Mn 3s spectrum gradually decreases from 6.17 eV (NMTP) to 5.91 eV (NMTP-Si 0.3 ), verifying the increased oxidation state from Mn 2+ to Mn 3+ . , This result demonstrates that the extra negative charge introduced by SiO 4 4– is balanced by the partial oxidation of Mn 2+ to Mn 3+ , which is consistent with the charge compensation rule. A similar phenomenon has also been observed in Na 4 MnCr(PO 4 ) 2.9 (SiO 4 ) 0.1 , whereby the valence state of Mn 2+ is increased following the SiO 4 4– substitution …”

Engineering hierarchical manganese molybdenum sulfide nanosheet integrated cathodes for high-energy density hybrid supercapacitors

“…As shown by eqn (8), the overall current (i) at a specific voltage (V) is composed of a capacitive process (k 1 v) and diffusion behavior (k 2 v 1/2 ). This equation can also be expressed by eqn (9), in which the k 1 and k 2 values can be achieved by plotting the linear plot of i/v 1/2 versus v 1/2 . The shadow area in Fig.…”

“…[5][6][7] Among the numerous EESSs, rechargeable batteries (RBs), especially lithium-ion batteries (LIBs), have served as the mainstream power supplies in electrical vehicles, portable devices, smartphones, and so on. [8][9][10] The RBs can provide high energy densities but they are still unsatisfied for the electrical vehicle requirements for long-term operations. Recently, the development of high-mass-loading electrodes (HMLEs) has been considered a promising strategy to improve the energy densities of RBs.…”

Facile construction of flower-like MoO2/MoS2 heterostructures encapsulated in nitrogen-doped carbon for high-performance sodium-ion storage

“…[1][2][3][4] However, these abundant energy sources suffer from intermittent and uneven geographical distributions, which hinder their continuous harvesting and supplies. [5][6][7][8] The construction of reliable energy storage systems (ESSs) offers a promising solution to address these issues. [9][10][11] Recently, lithium-ion batteries (LIBs) have been dominating the emerging markets of electric vehicles, smart devices, and portable electronics, which mainly benefit from their impressive advantages, including high power and energy densities as well as satisfactory lifespans.…”