Synthesis and Electrochemical Performance Analysis of LiNiO₂ Cathode Material Using Taylor-Couette Flow-Type Co-Precipitation Method

Abstract

A LiNiO2 cathode material with a layered structure and a high capacity was synthesized by co-precipitation with Taylor−Couette flow. Taylor−Couette flow is caused by the rotation of an inner cylinder in a device consisting of two concentric shaft cylinders. A regular donut-shaped vortex is developed above a certain rotational speed of the inner cylinder. Ni(OH)2 precursors synthesized by co-precipitation with the Taylor–Couette flow were sintered at 600 °C, 650 °C, 700 °C, and 750 °C. The LiNiO2 cathode material synthesized at 700 °C exhibited the highest discharge capacity of 233 mAh g−1. It was confirmed that the cyclability and rate performance of the LiNiO2 cathode material improved at other sintering temperatures.

Improving LiNiO2 cathode performance through particle design and optimization

“…We wish to emphasize that the rate capability of both oct-SC-LNO and cubic-SC-LNO are comparable to that of the state-of-the-art LiNiO 2 prepared by the co-precipitation method, even though our samples consist of micron-sized single crystals whereas the traditional LNO particles are often polycrystalline consisting of nanosized primary particles. 38,39 While particle size is well known for its role in kinetics and size reduction is often used as a strategy in improving rate capability, 40–42 here we clearly demonstrate the importance of particle morphology and surface in controlling kinetic properties. In commercial applications, the ability to achieve high rate capacity without resorting to small-sized cathode active particles is essential as it eliminates the challenges associated with high surface area, such as enhanced side reactions with the electrolyte and the need of using more inactive components (carbon and binder) during electrode fabrication.…”

Effect of a self-assembling La2(Ni0.5Li0.5)O4 and amorphous garnet-type solid electrolyte composite on a layered cathode material in all-solid-state batteries

“…When the R-factor is less than 1.2, Ni 2+ ions occupy the Li + ion site, which indicates that the material exhibits poor structural characteristics. 32,33 The potentiometric titration experiment was conducted to conrm the effect of the K 2 NiF 4 -type La 2 (Ni 0.5 Li 0.5 )O 4 material on the reduction of residual lithium compounds of Li 2 CO 3 and LiOH on the surface of NCM811 and NCM-LLZAO composite cathode materials. The corresponding results are shown in Table 2.…”

“…When the R-factor is less than 1.2, Ni 2+ ions occupy the Li + ion site, which indicates that the material exhibits poor structural characteristics. 32,33…”

Optimising the synthesis of LiNiO2: coprecipitation versus solid-state, and the effect of molybdenum doping

“…The hydrothermal process is regarded as an inherently complicated process and is difficult to scale up and so is not studied here. 18 This work therefore focuses on optimising the synthesis of LNO via two methods-solid-state and coprecipitation. Synthesis conditions including reaction time, temperature, and Li-excess level were optimised to synthesise stoichiometric LNO with minimal numbers of antisite defects.…”