Enhanced rate capability and high-voltage cycling stability of single-crystal nickel-rich cathode by surface anchoring dielectric BaTiO3

Functional dielectric materials for high-performance solid-state batteries

“…3(e-g), the BTO-modified NCM exhibits significantly superior cycling and rate performance at high voltage compared to the unmodified one. 74 Despite the excellent dielectric properties of BTO, inorganic particles still cannot adapt to the volume change of cathode particles. Fan et al…”

Research Progress on Enhancing the Performance of High Nickel Single Crystal Cathode Materials for Lithium-Ion Batteries

“…(i) The schematic mechanism diagram of the BaTiO 3 -modified SNCM. Reprinted with permission from ref . Copyright 2022, Elsevier.…”

“…When the coating is too thin, the electrochemical performance improvement is limited, and the experimental results cannot achieve the expected effect. Since BaTiO 3 is a material with strong dielectric properties, a large number of lithium vacancies will be generated on the surface of SC-NCM811 after the addition of BaTiO 3 , and sufficient sites provide a guarantee for lithium-ion jumping . The mechanism diagram is shown in Figure i, from which BaTiO 3 mainly promotes the kinetic behavior of lithium ions at the cathode/electrolyte interface when modifying SC-NCM, which makes it more convenient for lithium ions in the extraction/insertion process of the cathode.…”

“…Since BaTiO 3 is a material with strong dielectric properties, a large number of lithium vacancies will be generated on the surface of SC-NCM811 after the addition of BaTiO 3 , and sufficient sites provide a guarantee for lithium-ion jumping. 80 The mechanism diagram is shown in Figure 5i, from which BaTiO 3 mainly promotes the kinetic behavior of lithium ions at the cathode/electrolyte interface when modifying SC-NCM, which makes it more convenient for lithium ions in the extraction/insertion process of the cathode. Compared with the pristine NCM811, the BaTiO 3 -modified SC-NCM811 cathode material has a stable cyclic process structure at a high cutoff voltage, and other electrochemical properties are also more prominent than the pristine material.…”

Heat Generation Power of the LiNi0.8Co0.1Mn0.1O2 Cathode at Higher Charging Cutoff Voltages

“…In practice, for the maximum utilization of the lithium-ion storage capacity of cathode materials, such as NCM811 and other Ni-rich ternary materials, LIBs are often operated under a relatively higher charging cutoff voltage. , This, on the other hand, usually accelerates the crystalline structure and composition variation of cathode materials, , generates oxygen vacancies, , and causes the cation mixing of Li + /Ni 2+ . − For instance, Stach et al studied the structural evolution of LiNi 0.8 Co 0.15 Al 0.05 O 2 under a charging cutoff voltage of 4.8 V and found that a large number of oxygen vacancies were formed. Zhang et al illustrated that at a charging cutoff voltage of 4.8 V, oxygen release from Ni-rich NCM ternary cathode materials also occurred.…”