Suppressing structural degradation of Ni-rich cathode materials towards improved cycling stability enabled by a Li₂MnO₃ coating

Abstract

In situ XRD examinations demonstrate significant effects of a Li2MnO3 coating on suppressing structural degradation during charging/discharging of Ni-rich cathode materials for enhanced cycling stability.

Pathways toward Improved Performance of NCM523 Pouch Cell via Incorporating Low-Cost Al2O3 and Graphene

“…The Ni 2p XPS spectra shown in Figure a reveal that the signals of Ni 2p 3/2 are situated at 855 and 857.8 eV with a satellite peak at 861.2 eV, which can be corresponded to Ni 2+ and Ni 3+ , respectively. Being similar to previous reports, the peak of Ni 2p 3/2 was a mixture of chemical states of Ni 3+ and Ni 2+ . However, the content ratio of Ni 2+ and Ni 3+ for NCM is smaller than for other samples.…”

“…In addition to the analysis of conductance and polarization in Figure 4, the XPS experiment has been carried out to investigate the mechanism of enhanced LIB performance originating from the enhanced interface compatibility and enhanced stable NCM structure due to adding Gs and Al 2 O 3 NPs. Figure 5 Being similar to previous reports, 45 the peak of Ni 2p 3/2 was a mixture of chemical states of Ni 3+ and Ni 2+ . However, the content ratio of Ni 2+ and Ni 3+ for NCM is smaller than for other samples.…”

Functional Passivation Interface of LiNi0.8Co0.1Mn0.1O2 toward Superior Lithium Storage

“…Owing to the improved charge transfer at the cathode-electrolyte interface, NCM-2 exhibits the highest capacities at all current densities, that is, 211.4, 204.4, 190.0, 178.2, 160.0, 141.0, and 112.6 mA h g -1 from 0.25, 0.5, 1.25, 2.5, 6.25, 12.5 to 25.0 C, respectively, which are higher than those for NCM-0 (i.e., 201.8, 191.3, 175.2, 161.1, 141.0, 120.9, and 93.1 mA h g -1 ). Further, compared with the previously reported NCM charged to 4.5 V at the room temperature, [26,[34][35][36][37][38][39][40][41][42] the electrochemical performance of the pristine NCM in this work is normal in the initial discharge capacity (Table S2, Supporting Information) and the optimized sample exhibits the outstanding rate capability (Table S3 and Figure S6, Supporting Information). These indicate that our modification strategy for NCM has an excellent effect on improving the performance of NCM.…”

Preparation and electrochemical investigation of single-crystal LiNi0.6Co0.2Mn0.2O2 for high-performance lithium-ion batteries

“…Hence, the considerable heat release can be detected. 49 SC-3 shows the highest exothermic temperature (262.6 °C) and the minimal heat release (158.2 J g −1 ), much better than SC-1 and SC-5. This result is further proof that optimized single crystal grain morphology design can improve the thermal stability to suppress the structure degradation.…”