Improving Fast Charging-Discharging Performances of Ni-Rich LiNi0.8Co0.1Mn0.1O2 Cathode Material by Electronic Conductor LaNiO3 Crystallites

Abstract

Fast charging-discharging is one of the important requirements for next-generation high-energy Li-ion batteries, nevertheless, electrons transport in the active oxide materials is limited. Thus, carbon coating of active materials is a common method to supply the routes for electron transport, but it is difficult to synthesize the oxide-carbon composite for LiNiO2-based materials which need to be calcined in an oxygen-rich atmosphere. In this work, LiNi0.8Co0.1Mn0.1O2 (NCM811) coated with electronic conductor LaNiO3 (LNO) crystallites is demonstrated for the first time as fast charging-discharging and high energy cathodes for Li-ion batteries. The LaNiO3 succeeds in providing an exceptional fast charging-discharging behavior and initial coulombic efficiency in comparison with pristine NCM811. Consequently, the NCM811@3LNO electrode presents a higher capacity at 0.1 C (approximately 246 mAh g−1) and a significantly improved high rate performance (a discharge specific capacity of 130.62 mAh g−1 at 10 C), twice that of pristine NCM811. Additionally, cycling stability is also improved for the composite material. This work provides a new possibility of active oxide cathodes for high energy/power Li-ion batteries by electronic conductor LaNiO3 coating.

Improved Cycling Performance and High Rate Capacity of LiNi0.8Co0.1Mn0.1O2 Cathode Achieved by Al(PO3)3 Modification via Dry Coating Ball Milling

“…To analyze the fitting results of the contribution of CPE1 and CPE2 and the goodness of fitting factor, the fitting parameters are provided in the supporting information (Figure S2). The equivalent circuit consists of Re, Rsf, and Rct, which represent the internal resistance, surface film resistance, and charge transfer resistance, respectively [49,50]. The fitted values of Re, Rsf, and Rct are shown in Table 3.…”

“…The Li + diffusion coefficients (D Li + ) were calculated using Equation (3). In Equation ( 3), these parameters (R, T, C, F, A, and n) were widely reported in the previous literature and were treated with fixed values [49,51]. The σ value played the decisive role, which represents the Warburg coefficient [49].…”

“…In Equation ( 3), these parameters (R, T, C, F, A, and n) were widely reported in the previous literature and were treated with fixed values [49,51]. The σ value played the decisive role, which represents the Warburg coefficient [49]. The σ value could be obtained from the slope of the linear fitting of resistance (Z ) vs. the reciprocal square roots of the frequency (ω −1/2 ) [51].…”

A Review on Electrode Materials of Fast‐Charging Lithium‐Ion Batteries

“…But its safety should be improved. [27] For LiCoO 2 , it displays high specific capacity and a high and stable working voltage (3.7 V). Moreover, LiCoO 2 possesses high electronic conductivity (10 À 3 S cm À 1 ) and ionic conductivity (10 À 7 cm 2 s À 1 ).…”

“…LiNi x Co y Mn z O 2 possesses a high specific capacity, high ionic conductivity, and relatively low price which enable it a promising cathode material for fast‐charging LIBs. But its safety should be improved [27] . For LiCoO 2 , it displays high specific capacity and a high and stable working voltage (3.7 V).…”