High-power lithium-ion microbatteries from imprinted 3D electrodes of sub-10 nm LiMn2O4/Li4Ti5O12 nanocrystals and a copolymer gel electrolyte

The First Flexible Dual‐Ion Microbattery Demonstrates Superior Capacity and Ultrahigh Energy Density: Small and Powerful

“…− has been inserted into the cathode during charging. When DIMB is discharged from 5.0 V, the new peak lay in low diffraction angle becomes weak and merges with the (002) peak of the cathode, which signifies PF 6 insertion and extraction in graphite cathode is reversible. The XPS (Figure 3d,e and Figure S7, Supporting Information) and the electrochemical impedance spectroscopy ( Figure S8, Supporting Information) could father understand the kinetics of the DIMB.…”

“…In this DIMB, during the charging process, Li + ions in the electrolyte are intercalated into the graphite anode, while PF 6 ions are simultaneously intercalated into the graphite cathode (Figure 3a). Differing from the reaction mechanism of conventional microbattery, the DIMB operates on the anode and cathode through Li + and PF 6 − reversible intercalation reactions, respectively. [29] Therefore, the electrode reaction in DIMBs could be illustrated as follows (2)…”

“…A quantitative comparison of the cathode and anode element concentrations are counted as shown in Tables S1-S2 (Supporting Information). To further explore the intercalation/deintercalation of PF 6 − and Li + in the graphite layer, we performed ex situ Raman spectrum and ex situ X-ray diffraction (XRD) characterization of the interdigitated positive and negative electrodes under different charge and discharge states. It is reported that the ex situ Raman spectrum of graphite anode exhibits a unique layered structure under different charge/ discharge states, and the peak value of Raman active vibration mode E 2g is about 1580 cm −1 .…”

“…These in-situ Raman spectrum results suggest that the intercalation of PF 6 -− in graphite layer and the change of CC bond. The Raman signal about the charge/discharge process implies the intercalation (deintercalation) process of PF 6 − into (from) the graphite cathode. Obviously, as exhibited in Figure 3c, compared to the sharp (002) peak at about 26.56° on the original graphite cathode, when the DIMB is charged, a new visible peak gradually moves to the left which reveals that PF 6…”

Enhanced Li‐Storage of Ni3S2 Nanowire Arrays with N‐Doped Carbon Coating Synthesized by One‐Step CVD Process and Investigated Via Ex Situ TEM

“…Consequently, stable‐nanostructuring strategy is usually taken on Ni 3 S 2 to enhance its high‐rate performance. On the one hand, the ion/electron transport path can be shorten in nanosized Ni 3 S 2 compared with that in bulk electrode . On the other hand, nanostructures especially nanowires can support more void space to adapt the large volume expansion and relax the mechanical stress, thus alleviating pulverization during cycling .…”