A novelty strategy induced pinning effect and defect structure in Ni-rich layered cathodes towards boosting its electrochemical performance

Enhancing Structural Stability and Electrochemical Properties of Co-Less Ni-Rich Layer Cathode Materials by Fluorine and Niobium Co Doping

“…Moreover, ionic substitution is divided into cationic substitution and anionic substitution. In NCM ternary cathode material, Al is the most widely used doping element, and other dopants include Zr, Mg, Fe, Ca, Ga, , Ti, B, Ce, Nb, Na, Mo, F, Pr, etc.…”

“…15 Moreover, ionic substitution is divided into cationic substitution and anionic substitution. In NCM ternary cathode material, Al 16 is the most widely used doping element, and other dopants include Zr, 17 Mg, 18 Fe, 19 Ca, 20 Ga, 21,22 Ti, 23 B, 24 Ce, 25 Nb, 26 Na, 27 Mo, 28 F, 29 Pr, 30 Particularly, Yehonatan Levartovsky et al recently found that dopant of Nb tends to replace transition metal ions and can reduce the amount of Jahn−Teller active Ni 3+ ions, forming a strong bond between niobium and oxygen, thus improving the stability of the material. 31 Sung-Beom Kim et al have investigated that doping with appropriate amounts of F ions can effectively improve the transport properties of lithium ions and form stronger bonds between transition metals and F ions.…”

Improved Electrochemical Properties of Nickel-Rich, Low-Cobalt Layered Oxide Cathodes Using Dual-Functional Di-tert-butylmethyl Adamantoyl Silane Additives

“…The capacity fading in the case of LP57@NMC90 follows a steeper decline when compared to RSiCOAd@NMC90 cells owing to a faster degradation in the case of LP57@NMC90 cells (Figure S5c,d). The faster capacity degradation upon prolonged cycling in the case of LP57@NMC90 full cells is due to the combination of parasitic reactions such as irreversible phase transitions, electrolyte decomposition, manganese dissolution, etc. ,− After prolonged cycling (200 cycles), RSiCOAd@NMC90 cells exhibit ∼10% higher capacity retention when compared to LP57@NMC90 cells (Figure b). Table S1 shows the discharge capacities of LP57@NMC90 and RSiCOAd@NMC90 cells at the diagnostic cycles during prolonged cycling.…”

“…In the case of LP57@NMC90 cells, the deviation of the H2 ↔ H3 phase transitions gradually shifted to higher voltages at every diagnostic cycle during charge (Figure c). It is worth noting that the H2–H3 phase transition can induce sharp lattice contraction along the c -axis, resulting in anisotropic changes in the NMC90 cell volume. , On contrary, this phenomenon is not significant in the case of RSiCOAd@NMC90 cells . Furthermore, the deviation of the H2–H3 phase transition during charge and the H3–H2 phase transition during discharge in case of LP57@NMC90 cells is ∼0.15 V, while RSiCOAd@NMC90 cells exhibit only ∼0.1 V difference (Figure c,d).…”

First-Principles Study on the Interplay of Strain and State-of-Charge with Li-Ion Diffusion in the Battery Cathode Material LiCoO2

“…Because Li + is rapidly extracted and inserted in cathodes during the charging and discharging processes, the lattice parameters of the crystalline structure rapidly change. This charge/discharge cycle induces stresses and strains that can potentially cause microcracking. , For example, Tan et al observed the crystal damage in the LiNi 0.9 Co 0.05 Mn 0.05 O 2 (NCM) cathode during the charging process. By using in situ XRD characterization, they observed internal strain and stress accumulation upon Li + extraction.…”