A New Co-Free Ni-Rich LiNi_0.8Fe_0.1Mn_0.1O₂ Cathode for Low-Cost Li-Ion Batteries

Abstract

In recent years, with the rapid development of electric vehicles, the ever-fluctuating cobalt price has become a decisive constraint on the supply chain of the lithium-ion (Li-ion) battery industry. To address these challenges, a new and unreported cobalt-free (Co-free) material with a general formula of LiNi0.8Fe0.1Mn0.1O2 (NFM) is introduced. This Co-free material is synthesized via the coprecipitation method and examined by using scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and density functional theory (DFT) to investigate the morphological, crystal-structure, and electrochemical properties. The NFM cathode can deliver a specific capacity of 202.6 mA h g–1 (0.1C, 3.0–4.5 V), a specific energy capacity of 798.8 W h kg–1 in material level (0.1C, 3.0–4.5 V), a reasonable rate capability, and a stable cycling performance (81.1% discharge capacity retention after 150 cycles at 10C, 3.0–4.3 V). Although the research on this subject is still in its early stage, the capability of this novel cathode material as a practical candidate for applications in next-generation Co-free lithium-ion batteries (LIBs) is highlighted in this study.

Surface Reconstruction of Ni‐Rich Layered Cathodes: In Situ Doping versus Ex Situ Doping

“…To reveal the exceptional properties of in situ Zn‐NCM, the galvanostatic intermittent titration technique (GITT) curves of three samples are presented in Figure 6d. [ 35 ] of in situ Zn‐NCM is larger than that of the other materials during both charging and discharging (Figure 6e,f), which substantiates that in situ doping effectively improves Li + diffusion at the cathode surface. [ 13 ]…”

3D conductive iron fluoride (III) cathode with high loading for lithium-ion batteries

“…EIS analyses were tested on FeF 3 -CNFs to deeply understand the ion diffusion and charge transfer kinetics. Figure 5(a) presents the Nyquist plots of the FeF 3 -CNFs electrode before and after 100 cycles at 0.5 C. We can see that the R S is almost unchanged while the R CT decreases, indicating the enhancing ion diffusion and charge transfer [34]. It is also linked to the formation of stable and favorable cathode electrolyte interphase (CEI) on FeF 3 -CNFs electrodes.…”

One-Step Synthesis of Stoichiometric LiNi0.80Co0.15Al0.05O2 Precursor in Acidic Environment and Its Facile Growth into Single Crystals at Low Temperatures for Li-Ion Batteries

“…Figure c,d shows the Ni 2p spectra of the surface of NCA0.05 and NCA0.03 cathode materials before etching, and the two main peaks at 872.9 and 855.2 eV correspond to the Ni 2p 1/2 and Ni 2p 3/2 spin–orbit doublets, respectively. According to the fitting result, the fitted peaks at 854.5 and 872.2 eV belong to Ni 2+ , while the fitted peaks at 855.8 and 873.4 eV are attributed to Ni 3+ . ,– The ratio of Ni 3+ to Ni 2+ can be calculated quantitatively from the Ni 3+ and Ni 2+ fitted peak areas of both Ni 2p 3/2 and Ni 2p 1/2 . The ratio of Ni 3+ to Ni 2+ is 80:20 for the NCA0.05 cathode material, which is much larger than that for the NCA0.03 cathode material (66:34).…”