Use of carbon coating on LiNi0.8Co0.1Mn0.1O2 cathode material for enhanced performances of lithium-ion batteries

Abstract

Ni-rich cathode is one of the promising candidate for high-energy lithium-ion batteries. In this work, we prepare the different super-P carbon black amounts [0.1 (SPB 0.1 wt%), 0.3 (SPB 0.3 wt%), 0.5 (SPB 0.5 wt%) and 0.7 wt% (SPB 0.7 wt%)] of carbon coated LiNi0.8Co0.1Mn0.1O2 (NCM811) cathodes and their electrochemical performances are investigated. Carbon coating does not change the crystal structure and morphology of NCM811. Among the coated NCM811, the SPB 0.5 wt% NCM811 delivers the excellent cyclability (87.8% after 80 cycles) and rate capability (86.5% at 2 C) compared to those of pristine NCM811. It is ascribed to that the carbon coating not only increase the Li ion and electron transfer as well as protect the NCM811 cathode materials from side reaction at the electrolyte/NCM811 interface. Therefore, we can conclude that the appropriate amount of carbon coating can be regarded as an effective approach for Ni-rich NCM cathode.

Single‐crystalline Ni‐rich LiNi 0 . 91 Co 0 . 06 Mn 0 . 03 O 2

“…Since the identical electrolyte was applied, it was confirmed that the R s has almost the same value of 2.3 Ω. It is well known that the impedance of the cell is mostly affected by R ct among three resistances 23 . Before cycling (Figure 3E), the R ct values of both samples are almost identical.…”

“…It is well known that the impedance of the cell is mostly affected by R ct among three resistances. 23 Before cycling (Figure 3E), the R ct values of both samples are almost identical. However, the R ct of SCNCM91 is lower (24.8 Ω) in comparison with PCNCM91 (40.7 Ω) after cycling (Figure 3F), as listed in Table 3.…”

“…Among various endeavors, the heat‐treatment method is the easiest, simplest, and suitable for mass production since commercialized polycrystalline precursors can be used. To date, single crystalline with a low Ni content was reported in most of the literature 8 . More importantly, there are few reports of single‐crystalline NCM with more than 90% of Ni content since it is challenging to prepare the single‐crystalline Ni‐rich NCM (Ni ≥90%).…”

Energy density improvement by controlling the properties of conductive agents in Ni‐rich cathodes

“…The slope in the low-frequency region refers to the resistance to Warburg diffusion (W). 21 The data are fitted using an equivalent circuit shown in Figure 4C,D. The fitted data are listed in Table 3.…”

Interfacial reactions in lithia-based cathodes depending on the binder in the electrode and salt in the electrolyte

“…Lithium-ion batteries (LIBs) have attained a status as the most important energy storage device in society. However, widespread usage has led to demands for further enhanced LIBs with higher energy densities, consequently driving the development of high-capacity cathode materials [1][2][3][4][5][6][7] . Research conducted in this regard has concluded that the oxygen-related anionic redox reaction may be the key to signi cantly enhancing the capacity [8][9][10][11][12] .…”