Highly improved structural stability and electrochemical properties of Ni-rich NCM cathode materials

Advanced electrochemical and mechanical performance of a LiNi0.91Co0.06Mn0.03O2 cathode via use of a NaCl flux agent

“…Afterwards, the washed product was re-sintered at 700 °C for 6 hours under an O 2 atmosphere to enhance crystallinity. In addition, we also prepared polycrystalline LiNi 0.91 Co 0.06 Mn 0.03 O 2 (PC-NCM) using a previously reported method 24 and a brief description of the SC-NCM synthesis process is shown in Scheme 1.…”

Advancements and Challenges in High-Capacity Ni-Rich Cathode Materials for Lithium-Ion Batteries

“…Among these, metal oxide coatings, including Al 2 O 3 [159], Li 4 Ti 5 O 12 [160], ZrO 2 [161,162], Li 2 WO 4 [163], and Li 2 ZrO 3 [164] have emerged as widely adopted choices to address the limitations of Nirich materials. Shim et al [165] specifically applied an acidic WO 3 coating to NCM811 particles, leveraging its intercalation host properties attributed to its well-defined cubic ReO 3 -type structure and high resistance against HF attack. As depicted in Figure 15a,b, the WO 3 coating significantly enhanced the cycling performance of NCM811 within the 3-4.3 V range, and notably, under challenging conditions spanning a voltage range of 3-4.6 V. The capacity retention of the pristine active material at upper cutoff voltages of 4.3 V and 4.6V was 82% and 64.44%, respectively, while for the WO 3 -coated NCM811, the corresponding values were 85.8% and 76.46%, respectively.…”

“…First, the intensity peak related to phase transformation H2 → H3 that is in charge of particle pulverization and capacity fading decreased significantly. Secondly, the oxidation-reduction gap (∆E = E oxidation − E reduction ), which serves as a determinant of electrode polarization, reduced from 0.111 V to 0.094 V [165]. A TiO 2 coating was employed to provide comprehensive protection for NCM811 cathode active materials, capitalizing on its structural stability and chemical inertness against the electrolyte at high voltages [167].…”

“…The entire process of reaction between Li residual compounds and phosphoric acid can be expressed through the following Reactions ( 10)-( 12) [178,179]: The published works in recent years on the coating development of Ni-rich cathode materials are summarized in Table 4. [165] with permission from Elsevier. (f) Cyclic voltammetry curves for pristine and LaO-0.2.…”

Phosphate and Borate-Based Composite Interface of Single-Crystal LiNi0.8Co0.1Mn0.1O2 Enables Excellent Electrochemical Stability at High Operation Voltage

“…The first charge and discharge curves of the SCNCM-FC and SCNCM/(ALP+BA)-FC, at the current of 0.1 C in the voltage range of 2.8−4.3 V, (b) cycling performance of the SCNCM-FC and SCNCM/(ALP+BA)-FC electrode at the current of 1 C in the voltage range of 2.8−4.3 V. Refs. [ 49 , 50 , 51 , 52 , 53 ] were cited in the Supplementary Materials.…”