Boosting zinc storage in potassium-birnessite via organic-inorganic electrolyte strategy with slight N-methyl-2-pyrrolidone additive

Discovering Cathodic Biocompatibility for Aqueous Zn–MnO2 Battery: An Integrating Biomass Carbon Strategy

“…As shown in Figs. S5 a, S6 a, S7 a, S8 a, and S9 a, the phenomenon that the cathodic and anodic peaks of CV curves for all the samples shift toward negative and positive potentials respectively as the scan rate increases reveals a distinct insertion/deinsertion energy storage behavior of Zn 2+ [ 74 ]. The CP-20 sample, by contrast, has a stronger redox peak and smaller gap between cathodic and anodic peak, which indicates that CP-20 is promising to have faster dynamics, less polarization and better long cycle performance among the samples.…”

“…All the theoretical calculation about the models of Zn 2+ intercalating into the tunnel structures of pure γ-MnO 2 and γ-MnO 2 @CP were performed with VASP software based on density functional theory (DFT) in this work. The migration behavior of Zn 2+ was computed by mean square displacement ( MSD ) using the equation , where r i (0) is the initial position of Zn 2+ , r i ( t ) is the terminal position of Zn 2+ , and M is the number of simulation, then the diffusion coefficient ( D ) of Zn 2+ was calculated by fitting 6 t to MSD as the Einstein relation: [ 74 ]. The adsorption energy ( E ads ) values of Zn 2+ and OH − on the tunnel structural surface of γ-MnO 2 were calculated, and the bader charges of the above two models were also simulated respectively.…”

“…There are many factors affecting the properties of AZIBs, among which the development of stable cathodic materials becomes the key [ 66 – 73 ], and thereinto, MnO 2 with the characteristics of diverse structures (α-, β-, γ-, and δ-, etc. ), low price, and environmental friendliness has been widely used as cathodic materials of AZIBs [ 74 – 81 ]. Nevertheless, the repeated insertion/extraction of Zn 2+ during charge–discharge process leads to the structural deformation for MnO 2 [ 82 – 88 ].…”

Massively Reconstructing Hydrogen Bonding Network and Coordination Structure Enabled by a Natural Multifunctional Co‐Solvent for Practical Aqueous Zn‐Ion Batteries

“…In addition to conventional Liion batteries, [1][2][3] novel alkali metal ion batteries (K, Na) and multivalent metal ion batteries (Zn, Mg, and Al) have also been extensively studied. [4][5][6][7][8][9][10][11][12] Among them, aqueous Zn-ion batteries (AZIBs) are considered as one of the most promising energy storage systems, owing to their high safety, environmental friendliness, and abundant zinc resources. [13][14][15] In addition, the Zn anode has a low redox potential (0.762 V vs. SHE) and a high theoretical volumetric capacity (5855 mAh cm −3 ).…”