Lithium‐Rich Layered Oxide Li_1.18Ni_0.15Co_0.15Mn_0.52O₂ as the Cathode Material for Hybrid Sodium‐Ion Batteries

Abstract

Li-rich layered oxide Li1.18 Ni0.15 Co0.15 Mn0.52 O2 (LNCM) is, for the first time, examined as the positive electrode for hybrid sodium-ion battery and its Na(+) storage properties are comprehensively studied in terms of galvanostatic charge-discharge curves, cyclic voltammetry and rate capability. LNCM in the proposed sodium-ion battery demonstrates good rate capability whose discharge capacity reaches about 90 mA h g(-1) at 10 C rate and excellent cycle stability with specific capacity of about 105 mA h g(-1) for 200 cycles at 5 C rate. Moreover, ex situ ICP-OES suggests interesting mixed-ions migration processes: In the initial two cycles, only Li(+) can intercalate into the LNCM cathode, whereas both Li(+) and Na(+) work together as the electrochemical cycles increase. Also the structural evolution of LNCM is examined in terms of ex situ XRD pattern at the end of various charge-discharge scans. The strong insight obtained from this study could be beneficial to the design of new layered cathode materials for future rechargeable sodium-ion batteries.

Tuning Anionic Redox Activity and Reversibility for a High‐Capacity Li‐Rich Mn‐Based Oxide Cathode via an Integrated Strategy

“…In addition to the discharge profile at ≈4.75 V, as discussed above, the voltage plateaus (≈2.7 and 2.2 V) can be clearly observed in the coated materials but are not present in the pristine sample, indicating that the nanocoating has successfully induced the formation of a spinel phase. These two discharge plateaus can be ascribed to a phase transition and the reduction of Mn 4+ to Mn 3+ . The initial discharge capacities of the pristine and nanocoated (1%, 3%, and 5% LSO) samples are 247, 244, 125, and 106 mAh g −1 , respectively.…”

Enhanced Cycle Stability of Li1.2Ni0.13Mn0.54Co0.13O2 Cathode with Sodium Oxalyldifluoroborate Electrolyte Salt for Hybrid Li‐Na Ion Battery

“… [12] The formation of NaODFB is also evidenced by the Fourier transform infrared (FTIR) spectroscopy. The newly formed B−O characteristic stretching vibration at 1369.6 cm −1 was observed in the Fourier transform infrared spectrum (FTIR) [12–13] (Figure 2). The peaks at 1128.38 cm −1 and 1094.24 cm −1 are assigned to relatively uncoupled O−B−O and F−B−F stretching vibrations, respectively [12] .…”

Optimize solid‐state synthesis ofP2‐Na0.67Ni0.33Mn0.67O2cathode materials by using the orthogonal experimental design method

“…Recently, with the progress of society, human demand for energy has increased significantly, and the rapid development of large‐scale energy storage technology has aroused widespread concern. As the secondary battery with the highest energy density, lithium‐ion batteries (LIBs) are extensively used in all walks of life 1‐10 . With the development of technology, the high cost and safety problems of lithium‐ion batteries are gradually exposed, which also puts forward new requirements for finding energy storage technologies to replace lithium‐ion batteries.…”