Synthesis and electrochemical performance of ropelike LiNi_0.8Co_0.15Al_0.05O₂ fiber with nano-building blocks

Abstract

A ropelike LiNi 0.8 Co 0.15 Al 0.05 O 2 (NCA) fiber with superior rate capability and cycling stability was successfully synthesized via electrospinning and sintering as a cathode material for Li-ion batteries. The NCA fiber that exhibited excellent electrochemical performance as a cathode for Li-ion batteries was stacked and assembled from numerous nanoparticles. The NCA fiber delivered a high reversible capacity of 206.4 mAh g −1 at 0.1 C, and maintained 75% capacity retention after 100 cycles at 1 C. The high rate capability and outstanding cyclic stability were due to the ropelike fiber structure that shorten the Li + diffusion path, improved the Li + diffusion coefficient, and maintained the fiber structure during cycling.

Electrospun Nanofiber Electrodes for Lithium‐Ion Batteries

“…Zhang et al successfully synthesized a unique rope-like NCA fiber through electrospinning and sintering, which effectively shortened the Li-ion diffusion path and improved the Li-ion diffusion coefficient. [38] In addition, the fibrous structure was also beneficial to increase the contact area between electrolyte and active particles and reduce the aggregation of active particles. The results showed that the NCA fiber electrode exhibited excellent electrochemical performances, with a high discharge capacity of 206.4 mA h g −1 at 0.1 C and a capacity retention of 81.5% after 100 cycles at 0.5 C. In addition, it also maintained a good fiber structure during the cycle.…”

NCA, NCM811, and the Route to Ni-Richer Lithium-Ion Batteries

“…Ropelike NCA fiber was prepared via electrospinning and sintering. As a cathode, it delivered a capacity of 206.4 mAh g −1 at 0.1 C, and maintained 75% capacity retention after 100 cycles at 1 C [34]. A green and low-cost synthesis of NCA was also proposed, by using C 4 H 4 O 6 KNa•4H 2 O as a chelating agent to prepare Ni 0.80 Co 0.15 Al 0.05 (OH) 2 used as the precursor obtained through a coprecipitation method using potassium sodium tartrate [35].…”

High rate capability and cyclic stability of Ni‐rich layered oxide LiNi0.83Co0.12Mn0.05−xAlxO2 cathodes: Nanofiber versus nanoparticle morphology

“…The same author has carried out another study where a capacity of 160.2 mAh g −1 at 1C-rate for LiNi 0.8 Co 0.15 Al 0.05 O 2 cathode is reported on rope-like morphology synthesized through the electrospinning (ES) process. 14 However, the high Ni-based NMC cathode prepared by ES showed poor capacity retention of 74.9% after 100 cycles at 1C-rate. While there are few studies that address the methods to improve the electrochemical properties of cathode materials, such as Li-rich layered oxide, studies on nanofibrous Ni-rich layered oxides processed by the ES technique are scarce.…”

“…An initial discharge capacity of 191.2 mAh g −1 and capacity retention of 84% after 100 cycles are reported for the sample calcined at 750°C. The same author has carried out another study where a capacity of 160.2 mAh g −1 at 1C‐rate for LiNi 0.8 Co 0.15 Al 0.05 O 2 cathode is reported on rope‐like morphology synthesized through the electrospinning (ES) process 14 . However, the high Ni‐based NMC cathode prepared by ES showed poor capacity retention of 74.9% after 100 cycles at 1C‐rate.…”